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Synthesis and electrochemical performance of micro-nano structured li Fe1-xMnxPO4/C(0≤x≤0.05)cathode for lithium-ion batteries

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Journal of Energy Chemistry 2018年第3期27卷 923-929页

作者： Chunyang li Guojun li Xiaomei Guan liaoning Key Lab for New Energy Battery Dalian Jiaotong UniversityDalian 116028LiaoningChina School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028LiaoningChina

Micro-nano structured li Fe（1-x）MnxPO4/C（0≤x≤0.05）cathodes were prepared by spray drying,followed by calcination at 700°*** spherical li Fe（1-x）MnxPO4/C（0≤x≤0.05）particles with the size of 0.5 to5.0μm are composed of lots of nanoparticles of 20 to 30 nm,and have the well-developed interconnected pore *** contrast,when Mn doping content is 3 mol%（x=0.03）,the li Fe（0.97）Mn（0.03）PO4/C demonstrates maximum specific surface area of 31.30 m^2/g,more uniform pore size and relatively better electrochemical *** initial discharge capacities are 161.59,157.04 and 153.13 m Ah/g at a discharge rate of 0.2,0.5 and 1 C,***,the discharge capacity retentions are～100%after 120 *** improved electrochemical performance should be attributed to higher specific surface,smaller polarization voltage,and a high li~＋diffusion rate due to the micro-nano porous structure and lattice expansion produced by Mn doping.

关键词： li Fe1-xMnxPO4/C Spray drying Electrochemical property Micro-nano structure

Hollow and Hierarchical CuCo-LDH Nanocatalyst for Boosting Sulfur Electrochemistry in li-S Batteries

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Energy Material Advances 2023年第1期4卷 220-231页

作者： Min li Yebao li Qiao Cu Yan li Hongyang li Zihao li Ming li Hua liao Ge li Gaoran li Xin Wang South China Academy of Advanced Optoelectronics International Academy of Optoelectronics at ZhaoqingSouth China Normal UniversityGuangzhou 510006China MIIT Key Laboratory of Advanced Display Materials and Devices College of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Solar Energy Research Institute Yunnan Normal UniversityKunming 650500YunnanChina Department of Mechanical Engineering University of Alberta9211-116 Street NWEdmontonAlberta T6G 1H9Canada

lithium-sulfur batteries(LSBs)are promising candidates for next-generation high-efficiency energy storage,yet their practical implementation is seriously impeded by the parasitic shuttle effect and sluggish reaction ***,we develop a unique Cu,Co layered double hydroxide(CuCo-LDH)with a hollow and hierarchical structure as an advanced electrocatalyst to tackle these *** the compositional,architectural,and chemical advantages,the as-developed CuCo-LDH enables facile charge transfer,fully exposed active interfaces,and strong interactions with polysulfides via metal-sulfur *** employed in the functional separator,a reliable polysulfide barrier can be established against the shuttling behavior,while the excellent catalytic activity realizes fast and efficient sulfur *** a result,the CuCo-LDH-based LSBs achieve a well-restrained capacity decay of 0.049%per cycle over 500 cycles together with a good rate capability up to 5 ***,a favorable areal capacity of 4.39 mAh cm^(-2) and decent cyclability are still attainable even under a high sulfur loading of 4.2 mg cm^(-2) and a low E/S ratio of 6 ml g^(−1).This work affords a feasible and instructive pathway toward advanced sulfur electrocatalysts as well as high-performance LSBs.

关键词： sulfur catalyst sulfide

Additives strategies to improving cycling stability of li metal batteries by modifying electrode electrolyte interphases

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Progress in Natural Science:Materials International 2024年第2期34卷 338-344页

作者： Yuan li Pengfei Huang Chunyu Cui Xiaoyuan Ma li Chen Zekun li linhai li Yuhong Tian School of Biological and Chemical Engineering Guangxi University of Science and Technology School of College of Chemistry and Chemical Engineering Hunan University Isky Future Energy Institute

li metal batteries（LMBs） have attracted much attention due to the ultra-high theoretical capacity of the li metal anode（LMA）.However,the uncontrollable dendrites growth and low coulombic efficiency hinder their practical ***,we explore 3,5-difluoropyridine（2F-BD） as a novel electrolyte additive to enable highperformance *** 2F-BD additive participates in and modifies the solvation structure of li ions by reducing the coordinated number of PF6-at the electrode surface,leading to the formation of a liF and li3N-rich solid electrolyte interphase（SEI）.The liF component increases the robustness of SEI and suppresses the formation of li dendrites,while the li3N component facilitates the transportation and reaction kinetics of li *** a result,the li‖li symmetric cell presents a stable cycling performance of up to 500 h at a current density of 1 mA *** coupling with liFePO4cathode,the obtained full cell achieves high specific capacities of 106.06 mA h g-1and 84.98 mA h g-1at 2.55 mA cm-2and 5.10 mA cm-2,respectively,and maintains a high capacity retention of84.0% after 1000 cycles at 0.13 mA cm-2,with an average cycling CE of 99.58%.

关键词： li metal batteries li dendrites Electrolyte additive liF and li3N-Rich electrode-electrolyte interphase liFePO4 cathode

A Review on Thermal Management of li-ion Battery:from Small-Scale Battery Module to Large-Scale Electrochemical Energy Storage Power Station

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Journal of Thermal Science 2025年第1期 1-23页

作者： CHEN Zhifeng JIA li YIN liaofei DanG Chao REN Honglei ZHanG Zhiqiang Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale School of MechanicalElectronic and Control EngineeringBeijing Jiaotong University

li-ion battery is an essential component and energy storage unit for the evolution of electric vehicles and energy storage technology in the ***,in order to cope with the temperature sensitivity of li-ion battery and maintain li-ion battery safe operation,it is of great necessary to adopt an appropriate battery thermal management system(BTMS).In this paper,the current main BTM strategies and research hotspots were discussed from two aspects:small-scale battery module and large-scale electrochemical energy storage power station(EESPS).The practical application situation,advantages and disadvantages,and the future development trend of each heat dissipation method(air,liquid,PCM,heat pipe,hybrid cooling) were described in *** them,the air cooling and liquid cooling were reviewed in-depth based on the engineering *** PCM,heat pipe and hybrid cooling were reviewed extensively based on the latest *** research provides a comprehensive understanding for the BTMS in all scales.

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Fast capture and stabilization of li‐ions via physicochemical dual effects for an ultra‐stable self‐supporting li metal anode

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Carbon Energy 2023年第9期5卷 88-100页

作者： Xuzi Zhang Yue li Hao Zhang Ge li Department of Mechanical Engineering University of AlbertaEdmontonAlbertaCanada Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaCanada

lithium(li)metal is regarded as one of the most promising anode candidates for next-generation batteries due to its extremely high specific capacity and low redox ***,its application is still hindered by the uncontrolled growth of dendritic li and huge volume fluctuation during *** address these issues,flexible and self-supporting three-dimensional(3D)interlaced Ndoped carbon nanofibers(NCNFs)coated with uniformly distributed 2D ultrathin NiCo_(2)S_(4)nanosheets(denoted CNCS)were designed to eliminate the intrinsic hotspots for li *** dual effects of CNCS arise from limited surface li diffusivity with a higher li affinity,leading to uniform li nucleation and less random accumulation of li,as confirmed by ab initio molecular dynamics *** to the unique structure,exchange current density is reduced significantly and metallic li is further contained within the interspace between the NCNF and NiCo_(2)S_(4)nanosheets,preventing the formation of dendritic *** symmetric cell with a li/CNCS composite anode shows a long-running lifespan for almost 1200 h,with an exceptionally low and stable overpotential under 1mA cm^(-2)/1 mAh cm^(-2).A full cell coupled with a liFePO4 cathode at a low N/P ratio of 2.45 shows typical voltage profiles but more significantly enhanced performance than that of a liFePO4 cathode coupled with a bare li anode.

关键词： 3D scaffold design li affinity li diffusivity li metal anode long lifespan

Distribution and origin of brine-type li-Rb mineralization in the Qaidam Basin,NW China

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Science China Earth Sciences 2022年第3期65卷 477-489页

作者： Jiansen li Tingwei li Yunqi MA Fukun CHEN School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008China

The Qaidam Basin on the Qinghai-Tibet Plateau is well endowed with a variety of critical metals,such as li and ***,little is known about the distribution,source,and enrichment mechanisms of these *** this paper,we present results of systematic geochemical and H-O-B isotopic analyses of brines in the Tertiary and Quaternary sediments of the Qaidam *** results reveal that the paleobrines from oil-bearing anticlines at Dafengshan,Nanyishan,Youquanzi,Jiandingshan,and Jianshishan are significantly enriched in li and Rb,whose contents are 81.1-128.9 mg L^(-1)and 4.5-29.2 mg L^(-1),respectively,reaching levels of economic *** Rb contents(up to 12.5 mg L^(-1))and well-endowment of li also characterize the Dongtai,Xitai,Yiliping,and Senie salt lakes in the Qaidam *** Tertiary paleobrine average inδD andδ18O at-40.7‰and 2.84‰,*** paleobrine with the highest li and Rb hasδD andδ^(18)O values close to magmatic ***δ^(11)B values are lower than those of river water but close to those of geothermal fluids,suggesting that replenishment by deep magmatic hydrothermal fluid is most likely the key mechanism for the anomalous enrichment of these elements in the paleobrines,though evaporation and water-rock reactions have contributed to the critical metal *** anomalous enrichment of li and Rb in modern salt lake brines is closely related to the input of volcanic geothermal *** relatively high li and Rb contents of intercrystalline brines in salt lakes of the western Qaidam Basin and the increase of li and Rb contents with increasing depth were caused by upwelling of local paleobrines along the fault zones.

关键词： li and Rb resources Paleobrine Salt lake brine Hydrogen H-O-B isotopes Qaidam Basin

In situ decoration of nanosized metal oxide on highly conductive MXene nanosheets as efficient catalyst for li-O2 battery

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Journal of Energy Chemistry 2020年第8期29卷 272-280,I0010页

作者： Xingyu li Caiying Wen Huifeng li Genban Sun Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China

Combining nanomaterials with complementary properties in a well-designed structure is an effective tactic to exploit multifunctional, high-performance materials for the energy conversion and storage. Nonprecious metal catalysts, such as cobalt oxide, with superior activity and excellent stability to other catalysts are widely desired. Nevertheless, the performance of CoO nanoparticles as an electrode material were significantly limit for its inferior conductivity, dissolution, and high cohesion. Herein, we grow ultrafine cobalt monoxide to decorate the interlayer and surface of the Ti3C2 Txnanosheets via a hydrothermal method companied by calcination. The layered MXenes act as the underlying conductive substrate,which not only increase the electron transfer rate at the interface but also greatly improve the electrochemical properties of the nanosized Co O particles by restricting the aggregation of CoO. The resulting CoO/Ti3C2 Txnanomaterial is applied as oxygen electrode for lithium-oxygen battery and achieves more than 160 cycles and first cycle capacity of 16,220 mAh g-1 at 100 mA g-1. This work paves a promising avenue for constructing a bi-functional catalyst by coupling the active component of a transition metal oxide(TMO) with the MXene materials in lithium-oxygen battery.

关键词： MXene Nanosized CoO li-O2 batteries Cathode catalyst

Selenium vacancies enable efficient immobilization and bidirectional conversion acceleration of lithium polysulfides for advanced li-S batteries

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Nano Research 2022年第8期15卷 7234-7246页

作者： Yuanchang li Zhenfang Zhou Yong li Zhonghua Zhang Xiaosong Guo Jing liu Changming Mao Zhenjiang li Guicun li College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China

Heterostructures composed of oxides and sulfides(nitrides or carbides)show great potential as sulfur host additives because of the strong adoptability of oxides and catalytic capability of sulfides towards the notorious lithium polysulfides(liPSs).However,the migration and conversion pathway of liPSs is seriously confined at a localized interface with inadequate active *** this work,the introduction of selenium vacancies into VSe_(2−x)has been demonstrated to successfully synergize the adsorbability and catalytic reactions of liPSs at an integrated functional *** N-doped carbon nanosheets-assembled flower architectures embedded with selenium vacancy-rich VSe_(2−x)and partial vanadium oxides have been controllably synthesized and employed as the cathode additives for lithium-sulfur(li-S)*** the experiments and first-principle calculations reveal their strong adsorption to liPSs and their bidirectional catalytic functionality towards the conversion between S8 and li_(2)*** expected,the charge and discharge kinetics of VSe_(2−x)containing sulfur cathodes is fundamentally improved(an outstanding rate capabilitiy with 693.7 mAh·g^(−1)at 2 C,a remarkable long-term cyclability within 1,000 cycles at 2 C with S loading 2.27 mg·cm^(−2),and an excellent areal capacity with 3.44 mAh·cm^(−2)within 100 cycles at 0.5 C).This work presents an effective resolution to couple the adsorbability and catalytic reactions of liPSs at the material design perspective,and the insights on bidirectional catalytic functionality are of vital to develop functional materials for advanced li-S batteries.

关键词： lithium-sulfur batteries selenium vacancies vanadium selenide bidirectional catalysis conversion kinetics

Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe304 nanoparticles as high-performance li-ion battery anodes

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Nano Research 2017年第9期10卷 2923-2933页

作者： Wen Qi Xuan li Hui li Weikang Wu Pei li Ying Wu Chunjiang Kuang Shaoxiong Zhou Xiaolin li Beijing Key Laboratory of Energy Nanomaterials Advance Technology & Materials Co. Ltd. China Iron & Steel Research Institute Group Beijing 10008 I China School of Materials Science and Engineering Tianjin University Tianjin 300072 China Key Laboratory for liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Department of Stationary Energy Storage Pacific Northwest National Laboratory Richland Washington 99354 USA

Iron oxides have attracted considerable interest as abundant materials for high-capacity li-ion battery anodes. However, their fast capacity fading owing to poorly controlled reversibility of the conversion reactions greatly hinders their application. Here, a sandwich-structured nanocomposite of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles were developed as high-performance li-ion battery anode. N-doped graphene serves as a conducting framework for the self-assembled structure and controls Fe3O4 nucleation through the interaction of N dopants, surfactant molecules, and iron precursors. Fe3O4 nanoparticles were well dispersed with a uniform diameter of ~15 nm. The unique sandwich structure enables good electron conductivity and li-ion accessibility and accommodates a large volume change. Hence, it delivers good cycling reversibility and rate performance with a capacity of ~1,227 mA·h·g–1 and 96.8% capacity retention over 1,000 cycles at a current density of 3 A·g–1. Our work provides an ideal structure design for conversion anodes or other electrode materials requiring a large volume change.

关键词： N-doped graphene iron oxides self-assembly li-ion battery density functional theory