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A 3.9 V polyanion-type cathode material for Li-ion batteries

Progress in Natural Science:Materials International 2011年第3期21卷 211-215页

作者： Lei LIU,Bin ZHANG,Xue-jie HUANG Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Monoclinic phase LiFeSO4F was synthesized by a simple fast solid state reaction from the mixture of FeSO4·7H2O and LiF pulverized by high energy ball milling.m-LiFeSO4F was confirmed by GITT measurement to be a 3.9 V polyanion-type cathode materials for Li-ion *** electrochemical activity can be enhanced by addition of carbon.A discharge capacity of 105 mA·h/g (70%of theoretical value) was achieved for a m-LiFeSO4F/CNT *** separation behavior during lithium extraction and insertion was observed by ex-situ XRD test.

关键词： LiFeSO4F polyanion cathode Li-ion battery

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Pathway for high-energy density LiMnFePO4 cathodes

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Progress in Natural Science:Materials International 2023年第1期33卷 126-131页

作者： Shaoluan Huang Wenzhong Lin Liewu Li Pei Liu Tao Huang Zhencheng Huang Jinli kong Wei Xiong Wenwei Yu Shenghua Ye Jiangtao Hu Qianling Zhang Jianhong Liu Graphene Composite Research Center College of Chemistry and Environmental Engineering Shenzhen University Shenzhen Eigen–Equation Graphene Technology Co.Ltd.

polyanion cathodes are credited for its thermal stability and better safety, no matter in lithium ion batteries or sodium ion batteries. polyanion oxides with phosphate groups came to the public’s attention in 1997, and the representative material is LiFePO4, which has been widely applied and plays a huge role in the field of powder batteries and energy storage system. However, owing to the low lithiation potentials and storage sites, the energy densities of polyanion cathodes have been restricted, resulting of low-endurance and limited application scenarios. Accordingly, here, we use cheap and environmental friendly raw materials as precursors to synthesis high energy density LiMn0.6Fe0.4PO4@C cathode by a simple spray-drying and high temperature calcination *** self-designed liquid polyacrylonitrile(LPAN) is added for the intention of nanoparticle coating, conductive network construction and particle granulation. The low-cost and carbon-coated LiMn0.6Fe0.4PO4cathode exhibits excellent reversible capacity, low electrochemical polarization and excellent rate capacity, which maintains93.5% capacity retention after cycling 1000 times at 5C. The work introduces a new avenue to fabricate olivine structure cathodes with outstanding electrochemical performance for the high energy density lithium ion batteries.

关键词： polyanion cathode Liquid polyacrylonitrile Cost effective High energy density High stability

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Raising the capacity of lithium vanadium phosphate via anion and cation co-substitution

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Science China Chemistry 2020年第2期63卷 203-207页

作者： Xian-Xiang Zeng Hui Chen Gang Guo Sheng-Yi Li Jin-Ying Liu Qiang Ma Guote Liu Ya-Xia Yin Xiong-Wei Wu Yu-Guo Guo College of Science Hunan Agricultural UniversityChangsha 410128China Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China College of Electrical Engineering and Automation Foshan UniversityFoshan 528225China

The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron ***,using the sol-gel method,a lithium vanadium phosphate with higher average discharge voltage(3.8 V,***+/Li) was obtained from a single source for Mg2+ and Cl-co-substitution and uniform carbon coating,and a nearly theoretical capacity(130.1 mA h g^-1) and outstanding rate performance(25 C) are acquired together with splendid capacity retention(80%) after 650 *** work reveals that the well-sized anion and cation substitution and uniform carbon coating are of both importance to accelerate kinetic performance in the context of nearly undisturbed crystal structure for other analogue *** is anticipated that the electrochemistry comprehension will shed light on preparing cathode materials with high energy density in the future.

关键词： polyanion cathode ion substitution carbon coating high rate theoretical capacity

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