储能科学与技术 ›› 2022, Vol. 11 ›› Issue (3): 957-963.doi: 10.19799/j.cnki.2095-4239.2022.0002

• 储能新材料设计与先进表征专刊 • 上一篇    下一篇

干燥对复合负极力学行为的影响

江登峰1(), 陈亚君2, 贺耀龙1,3,4(), 卞炟1, 胡宏玖1,3   

  1. 1.上海市应用数学和力学研究所，上海大学力学与工程科学学院，上海 200072
    2.宁波大学 海运学院，浙江 宁波 315211
    3.上海大学上海市能源工程力学重点实验室，上海 200072
    4.之江实验室计算材料联合研究中心，浙江 杭州 311100
  • 收稿日期:2022-01-04 修回日期:2022-01-15 出版日期:2022-03-05 发布日期:2022-03-11
  • 通讯作者: 贺耀龙 E-mail:dengfengjiang@shu.edu.cn;yaolonghe@shu.edu.cn
  • 作者简介:江登峰（1999—），男，硕士研究生，研究方向为能源材料力学，E-mail：dengfengjiang@shu.edu.cn；
  • 基金资助:
    之江实验室智能材料计算平台与示范应用项目(2021PE0AC02);上海市力学信息学前沿研究基地项目，国家重点研发计划项目(2017YFB0701604)

Role of drying on the mechanical behavior of composite anodes

Dengfeng JIANG1(), Yajun CHEN2, Yaolong HE1,3,4(), Da BIAN1, Hongjiu HU1,3   

  1. 1.Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, China
    2.Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, Zhejiang, China
    3.Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China
    4.Joint-Research Center for computational materials, Zhejiang Laboratory, Hangzhou 311100, Zhejiang, China
  • Received:2022-01-04 Revised:2022-01-15 Online:2022-03-05 Published:2022-03-11
  • Contact: Yaolong HE E-mail:dengfengjiang@shu.edu.cn;yaolonghe@shu.edu.cn

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摘要：

本工作在不同干燥温度下分别制备了以聚偏二氟乙烯(PVDF)、丁苯橡胶/羧甲基纤维素钠(SBR/CMC)和海藻酸钠(SA)为黏结剂的碳包覆氧化亚硅多孔复合负极，并对其进行了系统的准静态拉伸和界面拉剪测试，以考察干燥温度对不同体系复合电极力学行为的影响。结果表明，提高干燥温度虽会提升电极干燥效率，但受高温下电极黏结剂厚向迁移的影响，各粘接体系下电极的拉伸性能和电极/集流体界面粘接性能都会随之削弱。干燥温度越高，力学性能削弱幅度越大。三种粘接体系相比，SBR/CMC体系在高温干燥后仍能保持较高的拉伸强度/模量比，以及相对较高的界面拉剪强度，因而较之SA和PVDF体系更适宜于高温干燥。

关键词: 干燥, 温度, 复合电极, 力学行为, 锂离子电池

Abstract:

Carbon-coated SiOx composite anodes with different drying temperatures and binding systems, including poly(vinylidene fluoride) (PVDF), polymerized styrene butadiene rubber/carboxymethyl cellulose (SBR/CMC), and sodium alginate (SA), were prepared. Their quasi-static tensile and interfacial tensile-shear properties were thoroughly tested. The results showed that when the drying temperature increases, the elastic modulus, tensile strength, and interface tensile-shear strength of the active layer of each binding system gradually decrease. Among them, the ratio of tensile strength to elastic modulus of electrodes containing SBR/CMC is the highest. Additionally, its tensile-shear strength is also relatively less affected by temperature. The ratio of tensile strength to elastic modulus of electrodes with SBR/CMC is better suited for high-temperature drying than SA and PVDF systems.

Key words: drying, temperature, composite electrode, mechanical behavior, lithium-ion battery

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