Pathway for high-energy density LiMnFePO_(4) cathodes  

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 

机构地区：[1]Graphene Composite Research Center,College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen,518060,PR China [2]Shenzhen Eigen-Equation Graphene Technology Co.Ltd.,Shenzhen,518000,PR China

出　　处：《Progress in Natural Science:Materials International》2023年第1期126-131,共6页自然科学进展·国际材料（英文版）

基　　金：supported and funded by National Key Research and Development Program of China (No.2020YFC1909604);National Natural Science Foundation (NNSF)of China (No.52202269);Shenzhen Key Pro-jects of Technological Research (No.JSGG20200925145800001);Shenz-hen Science and Technology Program (No.CJGJZD20210408092801005);Shenzhen Basic Research Project (No.JCYJ20190808145203535).

摘　　要：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 LiFePO_(4),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 sce-narios.Accordingly,here,we use cheap and environmental friendly raw materials as precursors to synthesis high energy density LiMn_(0.6)Fe_(0.4)PO_(4)@C cathode by a simple spray-drying and high temperature calcination process.The 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 LiMn_(0.6)Fe_(0.4)PO_(4) cathode exhibits excellent reversible capacity,low electrochemical polarization and excellent rate capacity,which maintains 93.5%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 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]