TPP添加剂对高镍高硅软包电池高温产气改善应用研究  

Study on the application of TPP additive to improve high temperature gas production of high nickel and high silicon soft pack batteries

作　　者：冀亚娟 黄佳苑 吴倩 谢英朋 杨雨寒 赵瑞瑞 JI Yajuan;HUANG Jiayuan;WU Qian;XIE Yingpeng;YANG Yuhan;ZHAO Ruirui(Huizhou Yiwei Lithium Energy Co.,Ltd.,Huizhou Guangdong 516006,China;School of Chemistry,South China Normal University,Guangzhou Guangdong 510006,China)

机构地区：[1]惠州亿纬锂能股份有限公司,广东惠州516006 [2]华南师范大学化学学院,广东广州510006

出　　处：《电源技术》2025年第1期99-105,共7页Chinese Journal of Power Sources

摘　　要：高镍/高硅软包电池存在日历寿命差及高温存储产气问题。通过满电态正负极与电解液间电化学稳定性分析表明,正极侧溶剂氧化分解是产气主要来源。研究表明:电解液中加入0.5%TPP,电池60℃存储7天,产气率由132%迅速降至6%,这归因于TPP添加剂可构建高热稳定性的正极界面CEI膜,抑制溶剂氧化,同时TPP因含3个不饱和炔基官能团,在硅负极表面与FEC共同参与成膜,增强SEI膜韧性,负极界面阻抗由9.45Ω降低至1.19Ω,降低87%。此外,TPP添加剂对硅基电池高温循环改善效果显著,45℃下1 C循环1000次,容量保持率由82.3%升至86.9%。TPP因其优异的高温成膜稳定性,有望解决高镍/高硅体系商业化面临的日历寿命不足问题,加快下一代高比能硅基电池产品的快速落地。High nickel/high silicon soft pack batteries have the problems of poor calendar life and high temperature storage gas production.The electrochemical stability analysis between the positive and negative electrodes and the electrolyte in full charge state shows that the main source of gas production is the oxidation decomposition of the solvent on the positive electrode side.The research shows that:when 0.5%TPP is added to the electrolyte,the gas production rate of the battery is rapidly reduced from 132%to 6%after being stored at 60℃for 7 days,which is attributed to the fact that TPP additives can build a CEI film with high thermal stability at the positive electrode interface and inhibit solvent oxidation.At the same time,TPP,because it contains 3 unsaturated alkynyl functional groups,co-participates in film formation with FEC on the silicon negative electrode surface,enhancing the toughness of SEI film.The interface impedance of the negative electrode is reduced from 9.45Ωto 1.19Ωby 87%.In addition,TPP additive has a significant effect on the high temperature cycle of silicon-based batteries,and the capacity retention rate of 1000 cycles of 1 C at 45℃increased from 82.3%to 86.9%.Therefore,because of its excellent high-temperature film forming stability,TPP is expected to solve the problem of insufficient calendar life faced by the commercialization of high nickel/high silicon systems,and accelerate the rapid landing of the next generation of high specific energy silicon-based battery products.

关 键 词：高镍/高硅体系 高温存储性能 磷酸三丙炔酯(TPP) 日历寿命 界面稳定化技术 

分 类 号：TM912[电气工程—电力电子与电力传动]