基于固态电解质膜的软包电池制备与初步表征  

Preparation and characterization of pouch cell based on solid-state electrolyte membrane

作　　者：吴勇民[1] 马尚德[1] 田文生[1] 吴晓萌[1] 朱蕾[1] 白羽 孟玉凤[1] 顾梅嵘[1] 张伟 温珍海[2] 靳俊[3] 杨丞[1] WU Yongmin;MA Shangde;TIAN Wensheng;WU Xiaomeng;ZHU Lei;BAI Yu;MENG Yufeng;GU Meirong;ZHANG Wei;WEN Zhenhai;JIN Jun;YANG Cheng(State Key Laboratory of Space Power Sources,Shanghai Institute of Space Power-Sources,Shanghai,200245,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian Province,350002,China;CAS Key Laboratory of Materials for Energy Conversion,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China)

机构地区：[1]上海空间电源研究所,空间电源全国重点实验室,上海200245 [2]中国科学院福建物质结构研究所,中国科学院功能纳米结构设计与组装重点实验室,福建省纳米材料重点实验室,福建福州350002 [3]中国科学院上海硅酸盐研究所,能量转换材料重点实验室,上海200050

出　　处：《电池工业》2024年第3期157-162,共6页Chinese Battery Industry

基　　金：国家重点研发计划(2022YFB3807700);山东省自然科学基金重大基础研究项目(ZR2021ZD24)。

摘　　要：固态电池安全性高、可适应高比能正负极,是蓄电池发展的方向,但存在固相界面阻抗大、界面结构稳定性差等问题。为了快速评估固态电池技术在实用型蓄电池中的作用,本文采用流延法制备了在50℃下离子电导率为6.16×10^(-4)S/cm的固态电解质膜。以高镍三元为正极、石墨为负极,制备了质量为1.1214 g、容量为53.44 mAh的微型软包电池和容量为7252.8 mAh的大容量软包电池。微型软包电池实现了5 C高倍率的放电和150次循环,大容量软包电池在放电深度(DOD)为13.78%时,实现了439次循环充放电。以上结果说明固态电解质膜满足在锂离子电池中使用的要求,然而这些电池的界面构筑仍有不足之处。基于本文结果,通过对固态电解质膜材料、电池化成制度等进行改进,有望促进高性能电池的研发。Solid-state batteries with high safety can adapt to high-capacity cathodes and anodes,which is the direction of battery development.However,it also has problems such as large solid-phase interface impedance and inadequate interface structure stability.In order to quickly evaluate the role of solid-state battery technology in practical batteries,a solid electrolyte membrane with an ionic conductivity of 6.16×10^(-4)S/cm at 50℃was prepared by casting method.Using high nickel ternary material as cathode and graphite as anode,a micro-pouch battery with weight of 1.1214 g and capacity of 53.44 mAh and a high capacity pouch battery with capacity of 7252.8 mAh were fabricated.The micro-pouch battery showed 150 cycles at a high discharge C-rate of 5 C.The high capacity pouch battery achieved 439 cycles at the DOD of 13.78%.The above results indicate that the solid electrolyte membrane is suitable for the practical applications of lithium ion batteries.However,the interface in these batteries still has some drawbacks.Based on the results of this paper,it is expected to promote the development of high-performance batteries by improving solid-state electrolyte materials and battery formation.

关 键 词：固态电解质膜 流延法 软包电池 锂离子电池 

分 类 号：TM911[电气工程—电力电子与电力传动]