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Nitrogen and fluorine co-doped TiO_(2)/carbon microspheres for advanced anodes in sodium-ion batteries: High volumetric capacity, superior {1. density and large areal capacity

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Journal of Energy Chemistry 2022年第5期31卷 104-112页

作者： Dan lv Dongdong Wang Nana Wang Hongxia {1. Shaojie Zhang Yansong Zhu Kepeng Song Jian yang Yitai Qian Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinan 250100ShandongChina Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusNorth WollongongNew South Wales 2500Australia Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical TechnologyTianjin UniversityTianjin 300072China Hefei National Laboratory for Physical Science at Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Fast charging and high volumetric capacity are two of the critical demands for sodium-ion batteries(SIBs).Although nanostructured materials achieve outstanding rate performance,they suffer from low tap density and small volumetric ***,how to realize large volumetric capacity and high tap density simultaneously is very ***,N/F co-doped TiO_(2)/carbon microspheres(NF- TiO_(2)/C)are synthesized to achieve both of *** calculations reveal that N and F co-doping increases the contents of oxygen vacancies and narrows the bandgaps of TiO_(2) and C,improving the electronic conductivity of NF- TiO_(2)/***,NF- TiO_(2)/C exhibits the high binding energy and low diffusion energy barrier of Na+,significantly facilitating Na+storage and Na+***,NF- TiO_(2)/C offers a high tap density(1.51.g cm^(-3)),an outstanding rate performance(1.5.9 mAh g^(-1. at 1.0 C),a large volumetric capacity(1.0 mAh cm^(-3) at 1.0 C),a high areal capacity(4.8 mAh cm^(-2))and an ultra-long cycling performance(80.2%after 1.,000 cycles at 1. C)*** addition,NF- TiO_(2)/C||Na_(3)V_(2)(PO_(4))_(3) full cells achieve an ultrahigh power density of 25.2 kW kg^(-1..These results indicate the great promise of NF- TiO_(2)/C as a high-volumetric-capacity and high-power-density anode material of SIBs.

关键词： TiO_(2) Heteroatom doping Volumetric capacity Areal capacity Sodium ion batteries

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Homogenous lithium plating/stripping regulation by a mass-producible Zn particles modified Li-metal composite anode

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Nano Research 2021年第11期14卷 3999-4005页

作者： ZiLi Zhang yang Jin Yu Zhao Jing Xu Bin Sun Kai {1. Hongfei Lu Nawei lv Zhimin Dang Hui Wu School of Electrical engineering Zhengzhou UniversityZhengzhou450001China State key Laboratory of power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

A stable lithium-metal anode is critical for high performance lithium-metal batteries. However, heterogeneous Li plating/stripping may induce lithium dendrites formation on bare lithium-metal anode, which lowers the cell Coulombic efficiency and weakens battery safety. We found that bare Li metal surface becomes bumpy and cratered with numerous pits formation during Li stripping. These pits enhance electric field distortion and heterogeneous ion distribution during plating. Li plating preferentially happens on the edge of the pits, intensifying the voltage variation and Li dendrites growth, which leads to the cell rapid death or separator piercing. Herein, we propose a facile and mass-producible method to homogenize Li plating/stripping via adding lithiophilic particles into Li metal. Zinc particles were uniformly pressed in Li metal by a facile and scalable physical strategy of “rolling”, and transformed into LiZn alloy in situ through Li-Zn alloying at room temperature in a few minutes. The critical role of modified LiZn/Li composite anode in stabilizing electrode surface was revealed by both electrochemical test and simulation. Compared with bare Li anode, the evenly dispersed LiZn alloy particles in Li metal can effectively regulate the Li plating/stripping on electrode surface, reducing deepness of pits during stripping and directionally inducing Li plating to maintain electrode surface stability. On this basis, the pits depth of LiZn/Li composite during Li stripping is reduced to ∼ 1. μm, which is much shallower than that of bare Li metal of ∼ 40 μm. The LiZn/Li composite electrode can stably cycle for 600 h under Li plating/stripping capacity of 1.mAh·cm−2 and current density of 1.mA·cm−2 without any short circuit. Furthermore, assembled LiZn/Li||LiFePO4 full cell presents better cycling stability and rate performances than that of based on bare Li anode.

关键词： lithium metal batteries Li-Zn allloy Li-metal composite anode regulation of current distribution homogenization Li plating/stripping

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Pollution sources of atmospheric fine particles and secondary aerosol characteristics in Beijing

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Journal of Environmental Sciences 2020年第9期32卷 91-98页

作者： Xi Zhang Kai Zhang Huiping liu Wenli {1. Masahide Aikawa Bing liu Jinhe Wang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Municipal and Environmental engineering Co-Innovation Center for Green Building of Shandong ProvinceShandong Jianzhu UniversityJinan 250101China Faculty of Environmental engineering The University of Kitakyushu1-1HibikinoWakamatsuKitakyushuFukuoka 808-0135Japan Qingdao Hongrui Electric power {1. Consulting Co. LtdQingdao 266100China Resources and Environment Innovation Research Institute School of Municipal and Environmental EngineeringShandong Jianzhu UniversityJinan 250101China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200438China

To investigate the secondary formation and pollution sources of atmospheric particles in urban Beijing,PM2.5 and its chemical components were collected and determined by URG-9000 D ambient ion monitor(AIM) from March 201. to January *** water-soluble ions(WSIs), NO3-,SO42- and NH4+(SNA) had the largest proportion(77.8%) with the total concentration of 23.8 μg/***,as fine particle pollution worsened,the NO3-,SO42- and NH4+ concentrations increased basically,which revealed that secondary aerosols were the main cause of particle pollution in ***,the particle neutralization ratio(1.1.,the ammonia to sulfate molar ratio(3.4) and the nitrate to sulfate molar ratio(2.2) showed that secondary aerosols are under ammonium-rich conditions with the main chemical forms of NH4 NO3 and(NH4)2 SO4,and vehicle emission could be the main anthropogenic source of secondary aerosols in *** analysis further indicated that secondary aerosols,solid fuel combustion,dust and marine aerosol were the principal pollution sources of PM2.5,accounting for about 46.1.,22.4% and 1..0%,respectively,and Inner Mongolia and Hebei Provinces could be considered as the main potential sources of PM2.5 in urban *** addition,secondary formation process was closely related with gaseous precursor emission amounts(SO2,NO2,NH3 and HONG),atmospheric ozone concentration(O3),meteorological conditions(temperature and relative humidity) and particle *** analysis of the thermodynamic equilibrium model(ISORROPIA Ⅱ)revealed that controlling total nitrate(TN) is the effective measure to mitigate fine particle pollution in Beijing.

关键词： pollution aerosol sources

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Niobium fluoride-modified hydrogen evolution reaction of magnesium borohydride diammoniate

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Journal of Materials Science & Technology 2023年第25期156卷 197-205页

作者： Yujie lv Bao Zhang Haixiang Huang Bogu {1. Wei lv Jianguang Yuan Guanglin Xia Xuebin Yu Dalin Sun Ying Wu School of Energy power and Mechanical {1. North China Electric Power UniversityBeijing102206China Institute of Energy power Innovation North China Electric Power UniversityBeijing102206China Jiangsu JITRI Advanced Energy & Materials Research Institute Co. Ltd.Changzhou213000China department of Materials Science Fudan UniversityShanghai200433China

Metal borohydride ammoniates have become one of the most promising hydrogen storage materials due to their ultrahigh ***,their application is still restricted by the high temperature of hydrogen desorption and the release of ***,to promote the dehydrogenation evolution and suppress the ammonia release,different amounts of NbF 5 were introduced into Mg(BH4)2·*** to the pure Mg(BH_(4))_(2)·2NH_(3),the Mg(BH_(4))_(2)·2NH_(3)-NbF_(5) composites exhibit lower onset dehydriding temperatures(53–57℃)and higher dehydriding capacities(5.6 wt.%–8.2 wt.%)at below 200℃,with the complete suppression of *** addition,7.4 wt.%H_(2) could be released from Mg(BH_(4))_(2)·2NH_(3)–5 mol%NbF5 composite at 200℃ within 20 min and the apparent activation energy is calculated to be 60.28 kJ mol^(-1.,which is much lower than that of pure Mg(BH_(4))_(2)·2NH_(3)(92.04 kJ mol^(-1.).Mg(BH_(4))_(2)·2NH_(3) should mechanochemically react with NbF5,forming dual-metal(Mg,Nb)borohydride ammoniate and spherical *** introduction of electronegative Nb cation results in-situ formation of(Mg,Nb)borohydride ammoniate towards a lower dehydrogenation temperature and a higher hydrogen release *** increased phase boundaries among the Mg(BH_(4))_(2)·2NH_(3),dual-metal(Mg,Nb)borohydride ammoniate,and MgF2 phases further facilitate the hydrogen diffusion during the dehydrogenation of the composites.

关键词： Hydrogen storage Magnesium borohydride Ammoniates NbF5 Catalysis

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CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai {1. Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH university of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui Applied Physics department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu university Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal university Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal {1. WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of {1. physics MianyangSichuan china building materials academy Beijing china Center of Advanced Science and Technology Beijing china Institute of Atomic Energy Beijing china Jiliang {1. HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china {1. of geosciences Beijing china {1. of geosciences WuhanHubei china {1. of Mining and Technology XuzhouJiangsu china West Normal {1. NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu university DalianLiaoning Dalian university of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East china {1. Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by{1.,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 geV Linac,a 1.1.geV Damping Ring,a Booster capable of achieving energies up to 1.0 geV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 1.0 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×1.^(34)cm^(-2)s^(-1.per interaction point(IP),resulting in an integrated luminosity of 1. ab^(-1.for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,201.)and the Conceptual Design Report(CDR,201.),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

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High-efficiency electrocatalytic NO reduction to NH_(3) by nanoporous VN

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Nano Research Energy 2022年第2期1卷 201-207页

作者： Defeng Qi Fang lv Tianran Wei Mengmeng Jin {1. Meng Shusheng Zhang Qian liu Wenxian liu Dui Ma Mohamed SHamdy Jun Luo Xijun liu MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China Institute for New Energy Materials and Low-Carbon Technologies Tianjin Key Lab for Photoelectric Materials&DevicesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China College of Chemistry Zhengzhou UniversityZhengzhou 450000China Institute for Advanced Study Chengdu UniversityChengdu 610106China College of Materials Science and {1. Zhejiang University of TechnologyHangzhou 310014China Catalysis Research Group(CRG) Department of ChemistryCollege of ScienceKing Khalid UniversityP.O.Box 900461413 AbhaSaudi Arabia

Electrocatalytic NO reduction reaction to generate NH_(3)under ambient conditions offers an attractive alternative to the energy-extensive Haber-Bosch route;however,the challenge still lies in the development of cost-effective and high-performance ***,nanoporous VN film is first designed as a highly selective and stable electrocatalyst for catalyzing reduction of NO to NH_(3)with a maximal Faradaic efficiency of 85%and a peak yield rate of 1.05×1.^(-7)mol·cm^(-2)·s^(-1.(corresponding to 5,1.0.8mg·h^(-1.·mg_(cat).^(-1.)at-0.6 V *** hydrogen electrode in acid ***,this catalyst maintains an excellent activity with negligible current density and NH_(3)yield rate decays over 40 ***,as a proof-of-concept of Zn-NO battery,it delivers a high power density of 2.0 mW·cm^(-2)and a large NH_(3)yield rate of 0.22×1.^(-7)mol·cm^(-2)·s^(-1.(corresponding to 1.077.1.g·h^(-1.·mg_(cat).^(-1.),both of which are comparable to the best-reported *** analyses confirm that the VN surface favors the activation and hydrogenation of NO by suppressing the hydrogen *** work highlights that the electrochemical NO reduction is an eco-friendly and energy-efficient strategy to produce NH_(3).

关键词： NH_(3)electrosynthesis green route nanoporous VN NO reduction reaction high-performance

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TPE-COF键合金属纤维的制备及作为SPME吸附剂用于液相色谱预富集水中抗生素的研究

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当代化工研究 2024年第18期 153-155页

作者：吕炳志刘宏宇邢成龙杨梦奇李保会华北电力大学环境科学与工程系河北071003 河北省燃煤电站烟气多污染物一体化控制重点实验室河北071003

将一种含有四苯乙烯基团的共价有机框架材料(TPE-COF)化学键合到蚀刻不锈钢纤维作为固相微萃取(SPME)的吸附剂,结合高效液相色谱法(HPLC),建立了水中痕量氟喹诺酮类(FQs)抗生素的在线SPME-HPLC分析方法。该方法的线性相关系数为0.9864~0... 详细信息

将一种含有四苯乙烯基团的共价有机框架材料(TPE-COF)化学键合到蚀刻不锈钢纤维作为固相微萃取(SPME)的吸附剂,结合高效液相色谱法(HPLC),建立了水中痕量氟喹诺酮类(FQs)抗生素的在线SPME-HPLC分析方法。该方法的线性相关系数为0.9864~0.991.,检出限(S/N=3)为0.31.0.53μg·L^(-1.,来自同一生产批次的3根纤维之间的相对标准偏差始终保持在6.9%以下。将建立的方法用于实际水样中FQs的测定,回收率为92.1.%~98.96%。

关键词：固相微萃取高效液相色谱共价有机框架抗生素

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Facile electrodeposition of 3D concentration-gradient Ni-Co hydroxide nanostructures on nickel foam as high performance electrodes for asymmetric supercapacitors

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Nano Research 2015年第8期8卷 2744-2754页

作者： Mingyang yang Hua Cheng Yingying Gu Zhifang Sun Jing Hu Lujie Cao Fucong lv Minchan Li Wenxi Wang Zhenyu Wang Shaofei Wu Hongtao liu Zhouguang Lu department of Materials Science and {1. South University of Science and Technology of China Shenzhen 518055 China College of Chemistry and Chemical {1. Central South University Changsha 410083 China

Novel three-dimensional （3D） concentration-gradient Ni-Co hydroxide nanostructures （3DCGNC） have been directly grown on nickel foam by a facile stepwise electrochemical deposition method and intensively investigated as binder- and conductor-free electrode for supercapacitors. Based on a three- electrode electrochemical characterization technique, the obtained 3DCGNC electrodes demonstrated a high specific capacitance of 1.760 F·g^-1.and a remarkable rate capability whereby more than 62.5% capacitance was retained when the current density was raised from 1.to 1.0 A·g^-1. More importantly, asymmetric supercapacitors were assembled by using the obtained 3DCGNC as the cathode and Ketjenblack as a conventional activated carbon anode. The fabricated asymmetric supercapacitors exhibited very promising electrochemical performances with an excellent combination of high energy density of 1.3.0 Wh·kg^-1.at a power density of 3.0 kW·kg^-1. and excellent rate capability-energy densities of about 70.4 and 26.0 Wh·kg^-1.were achieved when the avera{1. power densities were increased to 26.2 and 1.3.4 kW·kg^-1. respectively. Moreover, an extremely stable cycling life with only 2.7% capacitance loss after 20,000 cycles at a current density of 5 A·g^-1.was achieved, which compares very well with the traditional doublelayer supercapacitors.

关键词： electrodeposition concentration-gradient nickel cobalt hydroxides supercapacitors

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Evidence for oxygenation of Fe-Mg oxides at mid-mantle conditions and the rise of deep oxygen

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National Science Review 2021年第4期8卷 29-34页

作者： Jin liu Chenxu Wang Chaojia {1. Xiaowan Su Yijin liu Ruilian Tang Jiuhua Chen Qingyang Hu Ho-Kwang Mao Wendy L.Mao Center for High Pressure Science and Technology Advanced Research (HPSTAR) department of {1.ological Sciences Stanford University School of Earth and Space Sciences Peking University SLAC National Accelerator Laboratory Center for Study of Matter at Extreme Conditions Department of Mechanical and Materials Engineering Florida International University

As the reaction product of subducted water and the iron core, FeO2with more oxygen than hematite(Fe2O3) has been recently recognized as an important component in the D" layer just above the Earth’s core-mantle boundary. Here, we report a new oxygen-excess phase(Mg, Fe)2O3+δ(0 1. denoted as‘OE-phase’). It forms at pressures greater than 40 gigapascal when(Mg, Fe)-bearing hydrous materials are heated over 1.00 kelvin. The OE-phase is fully recoverable to ambient conditions for ex situ investigation using transmission electron microscopy, which indicates that the OE-phase contains ferric iron(Fe3+) as in Fe2O3but holds excess oxygen through interactions between oxygen atoms. The new OE-phase provides strong evidence that H2O has extraordinary oxidation power at high pressure. Unlike the formation of pyrite-type FeO2Hxwhich usually requires saturated water, the OE-phase can be formed with under-saturated water at mid-mantle conditions, and is expected to be more ubiquitous at depths greater than 1.00 km in the Earth’s mantle. The emergence of oxygen-excess reservoirs out of primordial or subducted(Mg,Fe)-bearing hydrous materials may revise our view on the deep-mantle redox chemistry.

关键词： subducting slab hydrous phase lower mantle deep oxygen oxygen-excess oxides

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减缓自由阴离子迁移以缓解浓差极化用于高性能的聚合物锂金属电池

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Science Bulletin 2024年第11期69卷 1706-1715页

作者：崔满营秦棪阳李智超赵洪洋刘理民江智元曹振江赵坚蕴毛博阳于伟苏亚琼 RVasant Kumar 丁书江屈治国郗凯 School of Chemistry Engineering Research Center of Energy Storage Materials and DevicesMinistry of EducationNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyState Key Laboratory for Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China MOE Key Laboratory of Thermo-Fluid Science and engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Chemical engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China department of {1. University of CambridgeCambridge CB30FAUK department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Traditional dual-ion lithium salts have been widely used in solid polymer lithium-metal batteries(LMBs).Nevertheless, concentration polarization caused by uncontrolled migration of free anions has severely caused the growth of lithium dendrites. Although single-ion conductor polymers(SICP) have been developed to reduce concentration polarization, the poor ionic conductivity caused by low carrier concentration limits their application. Herein, a dual-salt quasi-solid polymer electrolyte(QSPE), containing the SICP network as a salt and traditional dual-ion lithium salt, is designed for retarding the movement of free anions and simultaneously providing sufficient effective carriers to alleviate concentration polarization. The dual salt network of this designed QSPE is prepared through in-situ crosslinking copolymerization of SICP monomer, regular ionic conductor, crosslinker with the presence of the dual-ion lithium salt,delivering a high lithium-ion transference number(0.75) and satisfactory ionic conductivity(1.1. × 1.^(-3) S cm^(-1. at 30 ℃). Comprehensive characterizations combined with theoretical calculation demonstrate that polyanions from SICP exerts a potential repulsive effect on the transport of free anions to reduce concentration polarization inhibiting lithium dendrites. As a consequence, the Li||LiFePO_4 cell achieves a long-cycle stability for 2000 cycles and a 90% capacity retention at 30 ℃. This work provides a new perspective for reducing concentration polarization and simultaneously enabling enough lithiumions migration for high-performance polymer LMBs.

关键词： Polymer electrolyte Concentration polarization Energy storage materials Ion transport regulation Lithium-metal battery

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