广州化学2024,Vol.49Issue(6):7-11,5.DOI:10.16560/j.cnki.gzhx.20240602
功能化PVDF粘结剂的制备及在锂电池正极中的应用
Preparation of Functionalized Binder and Application to NCM811 Lithium Cathode Battery System
摘要
Abstract
Lithium N-trifluoromethanesulfonyl p-styrenesulfonimide(LiSTSI)was used as a grafting monomer,and an anionic polymer with good lithium ion conductivity was introduced by UV graft-functionalized modification of poly(vinylidene difluoride-co-hexafluoropropylene)(PVDF)as a polyelectrolyte-type binder STSI,and was applied in a ternary cathode LiNi0.8Co0.1Mn0.1O2(NCM811)system.The structure of the STSI binder was characterized using nuclear magnetic resonance hydrogen spectroscopy(1H-NMR)and fluorine spectroscopy(7F-NMR),the physical properties of the STSI binder were tested using 180° stripping experiment and contact angle experiment,and the electrochemical properties of the SISI binder were evaluated using multiplicity test and long cycle test.The results show that the introduction of this functional anionic branched chain can effectively improve the bond strength of the PVDF binder and form a lithium-ion conduction path in the cathode to improve the cathode electrochemical reaction,and after 100 cycles at a multiplicity of 0.2 C,the battery based on the STSI binder still maintains a specific capacity of 177.2 mAh/g,and maintains an average of 99.1%during the cycling process.关键词
PVDF/N-三氟甲磺酰基对苯乙烯磺酰亚胺锂(LiSTSI)/正极粘结剂/锂电池正极材料/高离子电导性Key words
PVDF/lithium N-trifluoromethanesulfonyl-p-styrenesulfonimide(LiSTSI)/lithium battery cathode material/high ionic conductivity分类
化学化工引用本文复制引用
石元昊,李智琪,付玉林,桂雪峰,许凯..功能化PVDF粘结剂的制备及在锂电池正极中的应用[J].广州化学,2024,49(6):7-11,5.基金项目
中国科学院科技服务网络计划(No.20211600200052) (No.20211600200052)