锂离子电池硅负极有机无机复合导电黏结剂的制备与性能  

Preparation and Properties of Organic-Inorganic Composite Conductive Binder for Silicon Anodes of Lithium-Ion Batteries

作　　者：李万坤 武帅[1] 张广元 胡俊 徐亮亮 季阔 李岩 杨妍 安百钢[1] LI Wankun;WU Shuai;ZHANG Guangyuan;HU Jun;XU Liangliang;JI Kuo;LI Yan;YANG Yan;AN Baigang(University of Science and Technology Liaoning,Anshan Liaoning 114051,China;Anshan Hifichem Co.,Ltd.,Anshan Liaoning 114000,China)

机构地区：[1]辽宁科技大学,辽宁鞍山114051 [2]鞍山七彩化学股份有限公司,辽宁鞍山114000

出　　处：《当代化工》2025年第3期544-549,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:52371224、51972156);2024年辽宁省大学生创新创业训练计划项目(项目编号:S202310146070);辽宁省高校基本科研业务费专项资金资助项目(项目编号:LJ222410146062)。

摘　　要：锂离子电池硅负极材料因其超高理论比容量(3579mA·h·g^(-1))而受到广泛关注,但硅负极较差的导电性以及在充放电过程中巨大的体积膨胀所引发的一系列问题严重限制了其商业化应用。基于以上问题,将聚乙烯醇(PVA)和MXene化学交联,构筑了有机无机复合导电黏结剂(PM),PM黏结剂兼具有机物优异的黏弹性、柔韧性和无机物良好的刚性,对硅负极巨大体积膨胀产生的应力实现了有效缓冲,保持了硅负极的完整稳定,同时PVA和MXene化学交联构筑的3D导电框架为电极的电化学反应提供了连续稳定的导电通路。得益于PM黏结剂“刚柔并济”的力学特性,Si/PM电极在0.5A·g^(-1)电流密度下经120次循环后仍保持1314.6mA·h·g^(-1)的可逆放电比容量。此研究为锂离子电池硅负极多功能黏结剂的设计提供了参考。Silicon(Si)based anode for lithium-ion batteries have garnered widespread attention due to their exceptionally high theoretical specific capacity(3579 mA·h·g^(-1)).However,the poor electrical conductivity of Si anodes and the significant volume expansion during the charge/discharge lead to a series of issues,severely limit their commercial application.In response to these challenges,the polyvinyl alcohol(PVA)and MXene were chemically crosslinked to construct an organic-inorganic composite conductive binder(PM).The PM binder combined the excellent adhesive elasticity and flexibility of organic materials as well as the good hardness of inorganic materials,effectively buffering the stress caused by the significant volume expansion of the Si anode and maintaining the integrity and stability of the electrodes.Meanwhile,the 3D conductive framework built by the chemical crosslinking of PVA and MXene provided a continuous and stable conductive pathway for the electrochemical reactions.Benefitting from the balance of rigidity and flexibility of the PM binder,the Si/PM electrode still maintained a reversible discharge specific capacity of 1314.6 mA·h·g^(-1)after 120 cycles at a current density of 0.5 A·g^(-1).The present study provides a guidance for the design of multi-functional binders for Si anodes of lithium-ion batteries.

关 键 词：锂离子电池 硅负极 有机无机复合 导电聚合物黏结剂 

分 类 号：TQ437[化学工程] TM912[电气工程—电力电子与电力传动]