摘要
用2,4,6,8-四甲基-2,4,6,8-四乙烯基环四硅氧烷(TVTMTS)作为添加剂,有效改善了在LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2/SiO@C全电池中的高温性能和界面特性。含有0.5%或1%TVTMTS的电池以60℃存储28天,厚度仅增长2.52%或3.04%。高温存储后的电池以1C速率循环100周期后,含有0.5%TVTMTS添加剂的电池,其容量保持率较空白组显著提升至92.61%。并且,通过对电解液60℃的高温存储,可以观察到含有TVTMTS的电解液色度值变化缓慢。此外,SEM数据说明了TVTMTS对电池正负极结构和电极-电解液界面稳定性均有积极作用。
This work reported2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane(TVTMTS)as a electrolyteadditive,and effectively improved the electrochemical performance and the interface characteristics ofLiNi0.5Co0.2Mn0.3O2/SiO@C cells in high temperature.After the28days storages at60℃when adding0.5%,1%TVTMTS,the thickness of cells only increased by2.52%and3.04%.The cells after stored at high temperaturewas cycled at1C rate for100times,the cells containing0.5%TVTMTS obtained greatest capacity retention of92.61%compared with blank group.In addition,the60℃electrolytes storage test was also studied in this work.The results of chromaticity showed the TVTMTS-contained electrolytes were more stable than blank group athigh temperature.Futhermore,SEM results showed that TVTMTS had positive effects on the structure of bothNCM cathode and silicon-based anode,as well as the electrode-electrolyte interface stability.
作者
沈佳琪
陈海峰
余乐
黄东海
罗智阳
SHEN Jia-qi;CHEN Hai-feng;YU Le;HUANG Dong-hai;LUO Zhi-yang(Shaanxi University of Science & Technology,Xi'an 710016,China;Guangzhou Key Laboratory of New Functional Materials for Power Lithium-ion Battery,Guangzhou Tinci Materials TechnologyCo. Ltd.,Guangzhou 510700,China)
出处
《广州化学》
CAS
2018年第6期9-16,共8页
Guangzhou Chemistry
基金
2017年广州市产学研协同创新重大项目(201704030011)
2017年广州市科技计划项目(201704030020)
作者简介
沈佳琪(1994-),女,内蒙古包头人,硕士研究生;主要从事锂离子电池电解液方向研究;通讯作者:陈海峰(1964-),男,陕西眉县人,博士,教授;主要从事化工过程节能方向研究。chenhf@sust.edu.cn
