以乙炔黑为碳源制备Li_(3)V_(2)(PO_(4))_(3)/C复合材料  

Preparation of Li_(3)V_(2)(PO_(4))_(3)/C Composite Material Using Acetylene Black as Carbon Source

作　　者：刘赛求 江友良 邹秋玲 马渤然 向延鸿[1] 伍建华[1] 熊利芝[2] 吴贤文[3] LIU Saiqiu;JIANG Youliang;ZOU Qiuling;MA Boran;XIANG Yanhong;WU Jianghua;XIONG Lizhi;WU Xianwen(School of Physics and Mechatronic Engineering,Jishou University,Jishou 416000,Hunan China;College of Pharmacy,Jishou University,Jishou 416000,Hunan China;School of Chemistry and Chemical Engineering Jishou University,Jishou 416000,Hunan China)

机构地区：[1]吉首大学物理与机电工程学院,湖南吉首416000 [2]吉首大学药学学院,湖南吉首416000 [3]吉首大学化学与化工学院,湖南吉首416000

出　　处：《吉首大学学报（自然科学版）》2021年第3期73-78,共6页Journal of Jishou University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(51862008,52064014,51762017和51762016);湖南省自然科学基金资助项目(2020JJ5457,2020JJ4505);湖南省教育厅科学研究项目(19A416,S201910531053);吉首大学校级研究课题(Jdy20030)。

摘　　要：以乙炔黑为碳源,采用溶胶凝胶法分步煅烧制备Li_(3)V2(PO_(4))_(3)/C,考察碳包覆量对材料的形貌、结构以及电化学性能的影响.结果表明,碳包覆没有破坏Li_(3)V_(2)(PO_(4))_(3)的单斜结构(P21/n),2倍乙炔黑包覆样(C20-LVP)的结晶度良好,包覆层为7 nm.0.1C倍率下,2倍乙炔黑包覆样的放电比容量由空白样(C00-LVP)的103.6 mAh·g-1提升到120.3 mAh/g,循环60次后放电比容量仍有104.5 mAh/g,保持率达91%.In this paper,Li_(3)V_(2)(PO_(4))_(3)/C material is successfully prepared by the simple sol-gel method and treated by further calcining.The effect of carbon coating on the morphology,structure and electrochemical performance of the material is comprehensively investigated.It's demonstrated that the monoclinic structure(P21/n)of Li_(3)V_(2)(PO_(4))_(3)/C retains complete after carbon coating.The sample with 7 nm coating layer presents excellent crystallinity,which coated by 2 times contents(C20-LVP)of carbon.The electrochemical performance has been improved a lot,with its discharge capacity increasing to 120.3 mAh/g compared with 103.6mAh/g of the sample without carbon coating(C00-LVP).In addition,a good retention rate of 91%can be obtained,since the discharge ratio can achieve 104.5 mAh/g the after 60 cycles.

关 键 词：锂离子电池 正极材料 磷酸钒锂 碳包覆 乙炔黑 溶胶凝胶 

分 类 号：TM912[电气工程—电力电子与电力传动]