VC-Li_2CO_3电解液添加剂对锂离子电池TMP基阻燃电解液电化学性能的影响  

Influence of VC-Li_2CO_3 Additives on the Electrochemical Properties of Electrolyte with TMP as Flame Retardant for Lithium-ion Batteries

作　　者：胡传跃[1] 郭军[1] 刘鑫[1] 汪形艳[1] 胡继林[1] 

机构地区：[1]湖南人文科技学院化学与材料科学系,湖南娄底417001

出　　处：《湖南人文科技学院学报》2009年第4期6-9,共4页Journal of Hunan University of Humanities,Science and Technology

基　　金：湖南省教育厅课题(06C458)

摘　　要：以磷酸三甲酯(TMP)为阻燃添加剂制备了4种锂离子电池电解液1 mol.L-1L iPF6(1-y%)(ECn-DMC1.0-EMC1.0)-y%TMP((n,y)=(1,44%),(1.5,39%),(2,35%),(1.0,0%))。考察了碳酸亚乙烯酯——碳酸锂添加剂对采用磷酸三甲酯阻燃添加剂的电解液的石墨负极与L iCoO2正极电化学性能的影响。结果表明,制备的1 mol.L-1L iPF661%(EC1.5-DMC1.0-EMC1.0)-39%TMP-4%VC-0.05 mol.L-1L i2CO3电解液具有较好的综合电化学性能,VC-L i2CO3添加剂有效抑制了TMP在碳电极的分解和共嵌入行为。采用这种电解液制备的L i/graph ite电池的首次放电比容量为336.5 mAh.g-1、以0.1 C倍率循环20次的放电比容量为334.5 mAh.g-1,制备的L i/L iCoO2电池的首次放电比容量为145.2 mAh.g-1、以0.1 C倍率循环20次的放电比容量为136.5 mAh.g-1。The electrolytes with TMP as flame retardant for lithium-ion battery were prepared, which are 1 mol · L^-1 LiPF6 （ 1-y% ） （ EC0- DMC1.0-EMC1.0 ） -y% TMP （（n,y） = （ 1, 44% ）, （ 1.5, 39% ）, （2, 35% ）, （ 1.0, 0% ） ）. Influence of VC-Li2 CO3 electrolyte additives on the electrochemeial properties of electreyte with TMP flame redartant were investigated using graphite anode and LiCoO2 cathode. Results showed that the electrolyte of 1 mol · L ^-1 LiPF6 61% （ EC1.5-DMC1.0-EMC1.0 ） - 39% TMP - 4% VC - 0. 05 mol · L ^-1 Li2CO3 delivered good electrochemcial properties. The TMP reduction decomposition and co-intercalation behavior on graphite electrode is suppressed with 4% VC-0.05 mol · L^-1 Li2 CO3 additives. The graphite anode has a discharge capacities of 336.5 mAh·g^-1 at first cycle and 334.5 mAh·g^-1 after 20 cycles at 0.1 C ratio. The LiCoO2 cathode has a discharge capacity of 145.2 mAh·g^-1 at first cycle and 136.5 mAh·g^-1 after 20 cycles at 0.1 C ratio.

关 键 词：锂离子电池 抗燃性电解液 TMP VC—Li2CO3 

分 类 号：O646[理学—物理化学] TM912[理学—化学]