三苯基氧化膦对锂离子电池电化学性能的影响  

Effect of triphenylphosphine oxide on electrochemical performance of lithium-ion battery

作　　者：熊楚安 封迈 王楠 Xiong Chu′an;Feng Mai;Wang Nan(School of Environment&Chemical Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China;Advanced Technology Research Institute of Beijing Institute of Technology,Jinan 250300,China)

机构地区：[1]黑龙江科技大学环境与化工学院,哈尔滨150022 [2]北京理工大学前沿技术研究院,济南250300

出　　处：《黑龙江科技大学学报》2023年第4期513-520,共8页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省省属高等学校基本科研业务费项目(2022-KYYWF-0568)。

摘　　要：针对基于传统六氟磷酸锂(LiPF6)-碳酸酯基电解液制备的锂离子电池工作电压受限的问题,设计了一种新型电解液,通过在碳酸酯电解液中加入高压添加剂三苯基氧化膦(TPPO),测试LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)正极在高电压下的运行效果。结果表明:在2.7~4.6 V电压窗口内,1 C循环50次后,当TPPO质量分数为1%时,电池容量保持率可以达到100.79%,未改性电池的容量保持率仅为58%;对循环后的NCM811极片表征发现,加入添加剂TPPO后,在充放电过程中,更容易在电池正极表面形成CEI膜,可以抑制高电压对正极表面的损害,从而提高电池高压下的电化学性能。This paper attempts to address the problem of the limition to working voltage of lithium-ion batteries prepared by traditional lithium hexafluorophosphate(LiPF6)-carbonate-based electrolyte.The study designs a new electrolyte by adding high-pressure additive triphenylphosphine oxide(TPPO) to the carbonate electrolyte,and testing the operation effect of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2(NCM811) cathode under high voltage condition.The results show that after 50 cycles of 1 C in 2.7-4.6 V voltage window,as the TPPO mass fraction is 1%,the battery capacity retention rate can reach 100.79%,and the capacity retention rate of the unmodified battery is only 58%.The characterization of NCM811 electrode pieces after cycle shows that after adding additive TPPO,it is easier to form a CEI film on the positive electrode surface of the battery in the charging and discharging process,which can inhibit the damage of high voltage to the surface of positive electrode,and thus improving the electrochemical performance of the battery under high voltage.

关 键 词：锂离子电池 电解液 高压性能 NCM811 

分 类 号：TM911.3[电气工程—电力电子与电力传动]