南京大学学报（自然科学版）2024，Vol.60Issue(5)：837-847,11.DOI:10.13232/j.cnki.jnju.2024.05.014
基于赖氨酸的可溶性聚酰亚胺黏结剂的制备及其在锂离子电池正极中的应用
Preparation of soluble polyimide binder based on lysine and its application in the cathode of lithium ion battery
摘要
Abstract
The high-energy density,high-nickel terpolymer lithium-ion battery system puts forward higher requirements for the key positive electrode binder.The use of green and clean biomass materials instead of traditional petroleum-based materials is an important measure to achieve the dual-carbon energy conservation and emission reduction.In order to solve the problems of single positive electrode binder and low cycle stability of lithium-ion battery,a lysine-based soluble polyimide binder(PMDA-Lys)was designed and synthesized by the chemical imide method,which can meet the performance requirements of high-nickel terpolymer LiNi0.8Co0.1Mn0.1O2(NCM811)system.The side chain carboxyl group of the binder can form a strong interaction force with the surface of the electrode particles,and the peel strength can reach 0.213 N·mm-1.The electrode prepared based on this can maintain the stability of the structure in the electrolyte environment with the continuous process of charge and discharge.Compared with traditional poly vinylidene fluoride(PVDF)adhesives,PMDA-Lys binders show better electrochemical performance and cycle stability in cyclic tests with lithium sheets(capacity retention greater than 85％after 100 cycles at 0.5 C).This bio-based polyimide binder provides new insights into the design of positive binders for lithium-ion batteries with green and high energy density.关键词
赖氨酸/聚酰亚胺/镍钴锰酸锂/电池正极/黏结剂Key words
lysine/polyimide/lithium nickel-cobalt manganate/battery cathode/binder分类
化学化工引用本文复制引用
王琪,黄芷怡,张秋红,贾叙东..基于赖氨酸的可溶性聚酰亚胺黏结剂的制备及其在锂离子电池正极中的应用[J].南京大学学报（自然科学版）,2024,60(5):837-847,11.基金项目
国家自然科学基金(22075130,21875102) （22075130,21875102）
