检索结果-南通市图书馆

Pr doped single-crystal LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)cathode enables high Rate capability and cycle stability for lithium ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2023年第1期9卷 82-89页

作者： Xiaopei Zhu Han Yu Lina Cheng Feifei Xu Zilu Wang Li-Zhen Fan Key Laboratory of New Energy Materials and Technologies Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Tianjin Guoan Mengguli New Materials Science&Technology Limit Corporation Tianjin301811China Beijing Mengguli New Materials Science&Technology Co. LtdBeijing102200China

The massive application of single crystal(SC)ternary cathode material LiNi_(1-x-y)Mn_(x)Co_(y)O_(2)is largely restricted by the unsatisfactory Rate capability which is caused by the sluggish Li+diffusion and structural instability.Herein,Pr^(3+),a large radius ion is introduced to single-crystal LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)to enhance Li^(+)conductivity and structural stability.With 0.4%Pr doping,the Li(Ni_(0.5)Mn_(0.3)Co_(0.2))_(0.996)Pr_(0.004)O_(2)cathode displays a capacity retention of 79.72%at 10 C,and a 98.17%capacity retention after 50 cycles at 25°C and 96.3%capacity retention after 50 cycles at 55°C within a 3.0–4.5 V voltage window.Electrochemical impedance spectroscopy confirms that the Pr doping can effectively lower the charge-transfer resistance and facilitate the transportation of Li^(+)on the surface of LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2).The Direct current internal resistance result implies that the structure of the Pr-doped cathode particles is more stable during cycling.In addition,differential scanning calorimetry measurements measurement combined with in situ X-ray diffraction confirms the thermo-stabilization effect of the Pr dopant.

关键词： Single-crystal cathode material Pr doping Rate capability Safety Lithium-ion battery

Sb-Cu alloy cathode with a novel lithiation mechanism of ternary intermetallic formation: Enabling high energy density and superior Rate capability of liquid metal battery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第3期78卷 393-400,I0011页

作者： Peng Chu Jie Wang Hongliang Xie Qian Zhang Jiangyuan Feng Zehao Li Zhao Yang Hailei Zhao School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Municiple Key Lab for Advanced Energy Materials and Technologies Beijing 100083China

Antimony(Sb) is an attractive cathode for liquid metal batteries(LMBs) because of its high theoretical voltage and low cost.The main obstacles associated with the Sb-based cathodes are unsatisfactory energy density and poor rate-capability.Herein,we propose a novel Sb_(64)Cu_(36)cathode that effectively tackles these issues.The Sb_(64)Cu_(36)(melting point:525℃) cathode presents a novel lithiation mechanism involving sequentially the generation of Li_(2)CuSb,the formation of Li_(3)Sb,and the conversion reaction of Li_(2)CuSb to Li_(3)Sb and Cu.The generated intermetallic compounds show a unique microstructure of the upper floated Li_(2)CuSb layer and the below cross-linked structure with interpenetrated Li_(2)CuSb and Li_(3)Sb phases.Compared with Li_(3)Sb,the lower Li migration energy barrier(0.188 eV) of Li_(2)CuSb significantly facilitates the lithium diffusion across the intermediate compounds and accelerates the reaction kinetics.Consequently,the Li‖Sb_(64)Cu_(36)cell delivers a more excellent electrochemical performance(energy density:353 W h kg^(-1)at 0.4 A cm^(-2);Rate capability:0.59 V at 2.0 A cm^(-2)),and a much lower energy storage cost of only 38.45 $ kW h^(-1)than other previously reported Sb-based LMBs.This work provides a novel cathode design concept for the development of high-performance LMBs in applications for large-scale energy storage.

关键词： Liquid metal battery Energy density Rate capability Low cost Sb_(64)Cu_(36)cathode

Fabricating multi-porous carbon anode with remarkable initial coulombic efficiency and enhanced Rate capability for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第1期34卷 127-132页

作者： Yong Tong Yuanji Wu Zihao Liu Yongshi Yin Yingjuan Sun Hongyan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China

Due to the abundant sodium reserves and high safety,sodium ion batteries(SIBs)are foreseen a promising future.While,hard carbon materials are very suitable for the anode of SIBs owing to their structure and cost advantages.However,the unsatisfactory initial coulombic efficiency(ICE)is one of the crucial blemishes of hard carbon materials and the slow sodium storage kinetics also hinders their wide application.Herein,with spherical nano SiO_(2)as pore-forming agent,gelatin and polytetrafluoroethylene as carbon sources,a multi-porous carbon(MPC)material can be easily obtained via a co-pyrolysis method,by which carbonization and template removal can be achieved synchronously without the assistance of strong acids or strong bases.As a result,the MPC anode exhibited remarkable ICE of 83%and a high Rate capability(208 m Ah/g at 5 A/g)when used in sodium-ion half cells.Additionally,coupling with Na3V2(PO4)3as the cathode to assemble full cells,the as-fabricated MPC//NVP full cell delivered a good Rate capability(146 m Ah/g at 5 A/g)as well,implying a good application prospect the MPC anode has.

关键词： Multi-porous carbon Initial coulombic efficiency Rate capability Sodium ion batteries Silica template

Ultrahigh Rate capability of 1D/2D polyaniline/titanium carbide(MXene)nanohybrid for advanced asymmetric supercapacitors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第1期15卷 285-295页

作者： Jinhua Zhou Qi Kang Shuchi Xu Xiaoge Li Cong Liu Lu Ni Ningna Chen Chunliang Lu Xizhang Wang Luming Peng Xuefeng Guo Weiping Ding Wenhua Hou Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Analytical Testing Center Yangzhou UniversityYangzhou 225009China

High energy density and enhanced Rate capability are highly sought-after for supercapacitors in today's mobile world.In this work,polyaniline/titanium carbide(MXene)(PANI/Ti3C2Tx)nanohybrid is synthesized through a facile and cost-effective self-assembly of.one-dimensional(10)PANI nanofibers and two-dimensional(20)Ti3C2Tx nanosheets.PANl!Ti3C2Tx delivers greatly improved specific capacitance,ultrahigh Rate capability(67%capacitance retention from 1 to 100 A·g^(-1))as well as good cycle stability.Electrochemical kinetic analysis reveals that PANI/Ti3C2Tx is featured with surface capacitance-dominated process and has a quasi-reversible kinetics at high scan rates,giving rise to an ultrahigh Rate capability.By using PANl!Ti3C2Tx as positive electrode,an 1.8 V aqueous asymmetric supercapacitor(ASC)is successfully assembled,showing a maximum energy density of 50.8 Wh·kg^(-1)·(at 0.9 kW-kg-1)and a power density of 18 kW·kg^(-1)(at 26 Wh·kg^(-1)).Moreover,an 3.0 V organic ASC is also elaborately fabricated,·by using PANI/Ti3C2Tx,achieving an ultrahigh energy density of 67.2 Wh·kg^(-1)(at 1.5 kW·kg^(-1))and a power density of 30 kW·kg^(-1)·(at 26.8 Wh·kg^(-1)).The present work not only improves fundamental understanding of the structure-property relationship towards ultrahigh Rate capability electrode materials,but also provides valuable guideline for the rational design of high-performance:energy storage devices with both high energy and power densities.

关键词： MXene polyaniline nanohybrid asymmetric supercapacitor Rate capability

Simultaneously tailoring material structure and surface for robust sodium storage:A case study of TiO_(2)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第5期136卷 91-96页

作者： Zhenzhu Wang Feng Yang Jiangfeng Ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China Department of Chemistry Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhen 518055China

Modulating the atomic structure and surface property represents a pivotal and intriguing approach to tai-loring the energy storage performance of battery materials,but their simultaneous modulation via simple processes remains a grand challenge.Taking TiO_(2)as an example,here we report the structure and sur-face modulation through a simple two-step operation,hydrogenation and fluorination,which impart high electrical conductivity and robust surface activity to the material.Hydrogenation introduces Ti^(3+)species in the TiO_(2)bulk to accelerate electron transport,while surface fluorination speeds up sodium-ion reaction dynamics.This modulated TiO_(2)exhibits robust Na+storage,affording 181 mAh g^(−1)over 2500 cycles at a high rate of 20 C.In addition,when paring with a commercial Na_(3)V_(2)(PO_(4))2 O_(2)F cathode,the designated TiO_(2)allows the full cell to deliver a remarkable power of 3700 W kg^(−1),outperforming most sodium-ion batteries.The correlation between the robust performance and the material property is understood through energy band analysis and density functional theory calculations.

关键词： Sodium-ion battery Titanium dioxide Fluorination Electrochemical performance Rate capability

Engineered NiCo-LDH nanosheets- and ZnFe_(2)O_(4) nanocubes-decorated carbon nanofiber bonded mats for high-rate asymmetric supercapacitors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2022年第6期7卷 1228-1240页

作者： Jae-Gyoung Seong Tae Hoon Ko Danyun Lei Woong-Ki Choi Yun-Su Kuk Min-Kang Seo Byoung-Suhk Kim Department of Organic Materials&Fiber Engineering Jeonbuk National University567 Baekje-daeroDeokjin-guJeonju-siJeollabuk-do54896Republic of Korea Department of BIN Convergency Technology Jeonbuk National University567 Baekje-daeroDeokjin-guJeonju-siJeollabuk-do54896Republic of Korea Korea Institute of Carbon Convergence Technology Jeonju54852Republic of Korea Department of Environmental Biology and Water Engineering College of Urban ConstructionWuchang Shouyi UniversityWuhan430064China

In this work,we have prepared the hierarchically nanostructured core–shell NiCo layered double hydroxide(NiCo-LDH)nanosheets-and ZnFe_(2)O_(4) nanocubes-decorated polyacrylonitrile(PAN)/pitch-based carbon nanofibers(PPCNs)webs(NiCo-LDH@PPCNs as cathode and ZnFe_(2)O_(4)@PPCNs as anode materials)with the bonded network structure by a facile and scalable hydrothemal method.Herein,the low-cost pitch with lower softening point(~90℃)as co-precursor was utilized to produce the PAN/pitch-based carbon nanofibers(PPCNs)with enhanced electrical conductivity.The obtained PPCNs with pitch content of 30%(PP30CNs)electrode material delivered higher specific capacitance(~67 F g^(-1))than that(~48 F g^(-1))of the PAN-based carbon nanofibers(PCNs)at 1 A g^(-1),due to the increased electrical conductivity and lower interfacial charge transfer resistance(RCT)of~0.16 U.Further,the NiCo-LDH-decorated PP30CNs(NiCoLDH@PP30CNs)as cathode material showed superior specific capacitance of 1162 F g^(-1) at 1.0 A g^(-1) and ultra-high retention rate of 91.56%at 10 A g^(-1).The ZnFe_(2)O_(4)@PP30CNs as anode material also showed higher specific capacitance of 282 F g^(-1) at 1 A g^(-1) and good Rate capability with capacitance retention of 56.73%at 10 A g^(-1).The as-fabricated asymmetric NiCo-LDH@PP30CNs//ZnFe_(2)O_(4)@PP30CNs hybrid supercapacitor device delivered a specific capacitance of~98 F g^(-1) at 1 A g^(-1) and excellent capacitance retention of~88%after 5000 charge–discharge cycles.

关键词： Carbon nanofiber Pitch Asymmetric Rate capability Supercapacitor

Realizing high-performance Na_(3)V_(2)(PO_(4))_(2)O_(2)F cathode for sodium-ion batteries via Nb-doping

在线全文

学校读者我要写书评

暂无评论

矿物冶金与材料学报:英文版 2023年第10期30卷 1859-1867页

作者： Jie Wang Yifeng Yuan Xianhui Rao Min’an Yang Doudou Wang Ailing Zhang Yan Chen Zhaolin Li Hailei Zhao School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Municipal Key Lab of Advanced Energy Materials and Technologies Beijing 100083China

Na_(3)V_(2)(PO_(4))_(2)O_(2)F(NVPOF)has received considerable interest as a promising cathode material for sodium-ion batteries because of its high working voltage and good structural/thermal stability.However,the sluggish electrode reaction resulting from its low intrinsic electronic conductivity significantly restricts its electrochemical performance and thus its practical application.Herein,Nb-doped Na_(3)V_(2-x)Nb_(x)(PO_(4))_(2)O_(2)F/graphene(rGO)composites(x=0,0.05,0.1)were prepared using a solvothermal method followed by calcination.Compared to the un-doped NVPOF/r GO,doping V-site with high-valence Nb element(Nb^(5+))(Na_(3)V_(1.95)Nb_(0.05)(PO_(4))_(2)O_(2)F/r GO(NVN05POF/rGO))can result in the generated V4^(+)/V3^(+)mixed-valence,ensuring the lower bandgap and thus the increased intrinsic electronic conductivity.Besides,the expanded lattice space favors the Na^(+)migration.With the structure feature where NVN05POF particles are attached to the rGO sheets,the electrode reaction kinetics is further accelerated owing to the well-constructed electron conductive network.As a consequence,the as-prepared NVN05POF/r GO sample exhibits a high specific capacity of~72 m Ah·g^(-1)at 10C(capacity retention of 65.2%(vs.0.5C))and excellent long-term cycling stability with the capacity fading rate of~0.099%per cycle in 500 cycles at 5C.

关键词： sodium vanadium fluorophosphate cathode doping Rate capability sodium-ion batteries

Silk fibroin-based biopolymer composite binders with gradient binding energy and strong adhesion force for high-performance micro-sized silicon anodes

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 442-451,I0010页

作者： Panpan Dong Xiahui Zhang Julio Zamora John McCloy Min-Kyu Song School of Mechanical and Materials Engineering Washington State UniversityPullmanWashington 99164United States

Micro-sized silicon anodes have shown much promise in large-scale industrial production of high-energy lithium batteries.However,large volume change(>300%)of silicon anodes causes severe particle pulverization and the formation of unstable solid electrolyte interphases during cycling,leading to rapid capacity decay and short cycle life of lithium-ion batteries.When addressing such issues,binder plays key roles in obtaining good structural integrity of silicon anodes.Herein,we report a biopolymer composite binder composed of rigid poly(acrylic acid)(PAA)and flexible silk fibroin(SF)tailored for micro-sized silicon anodes.The PAA/SF binder shows robust gradient binding energy via chemical interactions between carboxyl and amide groups,which can effectively accommodate large volume change of silicon.This PAA/SF binder also shows much stronger adhesion force and improved binding towards high-surface/defective carbon additives,resulting in better electrochemical stability and higher coulombic efficiency,than conventional PAA binder.As such,micro-sized silicon/carbon anodes fabricated with novel PAA/SF binder exhibit much better cyclability(up to 500 cycles at 0.5 C)and enhanced Rate capability compared with conventional PAA-based anodes.This work provides new insights into the design of functional binders for high-capacity electrodes suffering from large volume change for the development of nextgeneration lithium batteries.

关键词： Micro-sized silicon Binder Silk fbroin Strong adhesion force Rate capability Cyclability

Hollow multishelled structural TiN as multi-functional catalytic host for high-performance lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第11期16卷 12745-12752页

作者： Wei Xu Ruyi Bi Mei Yang Jiangyan Wang Ranbo Yu Dan Wang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100190China

Lithium-sulfur(Li-S)battery has attracted extensive attention because of its ultrahigh theoretical energy density and low cost.However,its commercialization is seriously hampered by its short cycling life,mainly due to the shuttle of soluble lithium polysulfides(LiPSs)and poor Rate capability due to sluggish reaction kinetics.Although significant efforts have been devoted to solving the problems,it is still challenging to simultaneously address all the issues.Herein,titanium nitride hollow multishelled structure(TiN HoMS)sphere is designed as a multi-functional catalytic host for sulfur cathode.TiN,with good conductivity,can effectively catalyze the redox conversion of S and LiPSs,while its surficial oxidation passivation layer can strongly anchor LiPSs.Besides,HoMS enables TiN nanoparticle subunits to expose abundant active sites for anchoring and promoting conversion of LiPSs,while the multiple shells provide physical barriers to restrict the shuttle effect.In addition,HoMS can buffer the volume expansion of sulfur and shorten the charge transport pathway.As a result,the sulfur cathode based on triple-shelled TiN HoMS exhibits an initial specific capacity of 1016 mAh·g-1 at a high sulfur loading of 2.8 mg·cm-2 and maintains 823 mAh·g-1 after 100 cycles.Moreover,it shows a four times higher specific capacity than the one without TiN host at 2 C.

关键词： lithium-sulfur batteries titanium nitride hollow multishelled structure shuttle effect Rate capability