电解液添加剂提升LiNi_(0.85)Co_(0.1)Al_(0.05)O_(2)正极的高压循环稳定性  

Improving LiNi_(0.85)Co_(0.1)Al_(0.05)O_(2) Cathode Cyclic Stability at High Voltages with Electrolyte Additive

作　　者：林乙龙 木慧 纪燕珊 杨超辉 高书晴 韩诗韵 陈燕舞[1] 刘锋[1] 王康 LIN Yilong;MU Hui;JI Yanshan;Yang Chaohui;GAO Shuqing;HAN Shiyun;CHEN Yanwu;LIU Feng;WANG Kang(Shunde Polytechnic,Foshan Guangdong 538333,China;Guangzhou Great Power Energy and Technology Co.,Ltd,Guangzhou Guangdong 510650,China)

机构地区：[1]顺德职业技术学院,广东佛山528333 [2]广州鹏辉能源科技股份有限公司,广东广州510650

出　　处：《顺德职业技术学院学报》2025年第1期44-49,共6页Journal of Shunde Polytechnic

摘　　要：4-丙基硫酸乙烯酯(PDTD)作为电解液添加剂被用于提升高压4.5 V LiNi_(0.85)Co_(0.1)Al_(0.05)O_(2)(NCA)的电极/电解液界面稳定性。当添加0.5 wt.%PDTD到基准电解液,即1.0 M LiPF_(6)溶解在碳酸乙烯酯(EC)/碳酸甲乙酯(EMC)(1/2,w/w),Li/NCA电池循环300次后容量保持率由21.6%提升至62.6%。同时,PDTD能有效抑制Li/NCA电池的电压降,在基准电解液中,满电电池电压在400 h后急剧下降到2.0 V以下,而含添加剂电池电压则能保持极高的稳定性。电池循环后的电化学表征和电极物理表征证明了该添加剂有效提升了NCA正极/电解液界面稳定性,保护了电极材料。4-propyl-[1,3,2]dioxathiolane-2,2-dioxide(PDTD)is used as an electrolyte additive to enhance the interfacial stability of LiNi_(0.85)Co_(0.1)Al_(0.05)O_(2)(NCA)/carbonate electrolyte under high-voltage 4.5 V.When 0.5 wt.%PDTD is added to the baseline electrolyte,which is 1.0 M LiPF6 dissolved in ethylene carbonate(EC)/ethyl methyl carbonate(EMC)(1/2,w/w),the capacity retention rate of Li/NCA batteries increases from 21.6%to 62.6%after 300 cycles.At the same time,PDTD can effectively inhibit the voltage drop of Li/NCA batteries.In the baseline electrolyte,the voltage of fully charged batteries drops sharply to below 2.0 V after 400 hours,while the voltage of batteries containing additives maintains high stability.The electrochemical characterization and physical characterization of cycled electrodes demonstrate that the additive improves the interfacial stability of NCA cathode/electrolyte and protects the electrode materials.

关 键 词：NCA正极 PDTD添加剂 界面稳定性 

分 类 号：TM912[电气工程—电力电子与电力传动]