双离子电池正极材料石墨片和石墨颗粒的电化学性能研究  

Investigation of electrochemical performances of graphite flakes and graphite particles as cathode materials for dual-ion batteries

作　　者：张纪正 韩方超 陈玉喜[1] 蔡杰 熊琳 陈沛林 刘洪波[1] Zhang Ji-zheng;Han Fang-chao;Chen Yu-xi;Cai Jie;Xiong Lin;Chen Pei-lin;Liu Hong-bo(College of Materials Science and Engineering,Hunan University,Hunan Changsha 410082,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《炭素技术》2022年第2期21-26,共6页Carbon Techniques

基　　金：湖南省自然科学基金(2020JJ4185)。

摘　　要：双离子电池正极材料石墨存储阴离子的电化学性能对于双离子电池的能量密度和循环寿命起到关键作用。采用厚度为30~50 nm的石墨片和人造石墨颗粒作为双离子电池正极材料,对比研究了两种石墨正极材料的微观结构和存储阴离子PF;的电化学性能。研究发现,石墨片的充放电循环稳定性、倍率性能以及抗高电压性能均明显优于石墨颗粒。石墨片在0.5 A/g(~5C)电流密度下经过3000次循环的可逆比容量为68.2 mAh/g,每次循环的容量衰减率仅为0.0059%。在10C下的可逆比容量仍有65.3 mAh/g,展现出优异的电化学性能。石墨片是一种具有广阔应用前景的双离子电池正极材料。The electrochemical anion-storage performance of graphitic cathode materials for dual-ion batteires(DIBs)plays a key role in determining energy density and cyclic performance of DIBs.Herein,graphite flakes(GF)with thickness of 30~50 nm and artificial graphite particles(HRG)were employed as cathode candidates for DIBs.Their microstructure and anion PF;storage performance were investigated.The cyclic stability,rate capability and high voltage-performance of GF are superior to those of HRG.GF exhibits a reversible capacity of 68.2 mAh/g after 3000 discharge/charge cycles at a current density of 0.5 A/g(~5C).The capacity fading rate of each cycle is as low as 0.0059%.Furthermore,the reversible capacity reaches 65.3 mAh/g at 10C,displaying excellent electrochemical performance.GF is much promissing cathode material for DIBs.

关 键 词：石墨 石墨片 双离子电池 正极材料 电化学性能 

分 类 号：O613.71[理学—无机化学] TQ165[理学—化学] TM911.15[化学工程—高温制品工业]