摘要： 【目的】硅（ Si）因其极高的理论比容量被视为最具前景的锂离子电池负极材料，但其巨大的体积膨胀（>300%）使固态电解质界面（ SEI）膜反复的破裂与再生，从而导致电极粉化，容量快速衰减。针对该问题，设计并制备了一种能够适应体积变化、维持电极结构完整并保障锂离子传输的多功能水性黏结剂。【方法】首先，通过柠檬酸铁（ FeCA）不完全解离金属盐中的 Fe3+与聚丙烯酸（ PAA）羧基的配位作用构建动态网络（ PAA-FeCA）。随后，引入聚吡咯（PPy）贯穿基体形成连续的三维导电网络，与 PAA-FeCA动态配位网络互锁，构筑刚柔协同的双交联体系。【结果】基于该黏结剂的硅负极表现出优异的综合性能， PAA-FeCA-PPy@Si电极柔韧性和黏附力显著提升，在 0. 5 C（1C对应电流密度 4 200. 00 mA/g）倍率下展示了高的可逆放电容量（ 3 451. 90 mAh/g）。【结论】动态配位键与导电网络的协同设计是解决硅负极核心失效问题的有效策略，为高性能硅基负极的开发提供了新的思路。
关键词:
锂离子电池,
硅基负极,
水性黏结剂,
聚丙烯酸,
三维网络
Abstract: ［Objective］Silicon（Si）is regarded as one of the most promising anode materials forlithium-ion batteries due to its ultrahigh theoretical specific capacity. However，its huge volume expansion（>300%）leads to repeated rupture and regeneration of the solid-electrolyte interphase（SEI） film，resulting in electrode pulverization and rapid capacity fading. To address this issue，a multifunctional aqueous binder that can accommodate volume changes，maintain electrode structural integrity，and ensure efficient lithium-ion transport was designed and prepared.［Methods］First，a dynamic network（PAA-FeCA） was constructed via the coordination interaction between Fe3+ from partially dissociated ferric citrate（FeCA） and carboxyl groups in polyacrylic acid（PAA）. Subsequently，polypyrrole（PPy）was introduced to penetrate the matrix to form a continuous three-dimensional conductive network，which interlocks with the PAA-FeCA dynamic coordination network， establishing a dual-crosslinked system with synergistic rigidity and flexibility.［Results］The silicon anode based on this binder exhibited excellent comprehensive performance. The PAA-FeCA-PPy@Si electrodeshowed significantly improved flexibility and adhesion. At a rate of 0. 2 C（1 C=4 200. 00 mAh/g）and 0. 5 C，it delivered high reversible discharge capacities of 4 089. 39 mAh/g and 3 451. 90 mAh/g， respectively.［Conclusion］ The synergistic design of dynamic coordination bonds and conductivenetworks is an effective strategy to solve the core failure problems of silicon anodes，providing a new approach for the development of high-performance silicon-based anodes.
Key words:
lithium-ion battery；silicon-based anode；aqueous binder；polyacrylic acid；3D network
中图分类号:
李建斌, 刘鸿岩, 任玉荣, 何庆迪, 胡 中, 曹亚成, 马智俊, 许 飞. 锂离子电池硅负极用水性PAA 基黏结剂的性能研究[J]. 涂料工业, 2026, 56(9): 1-7.
Li Jianbin, Liu Hongyan, Ren Yurong, He Qingdi, Hu Zhong, Cao Yacheng, Ma Zhijun, Xu Fei. Study on the performance of aqueous PAA-based binder for silicon anode in lithium-ion batteries[J]. Paint & Coatings Industry, 2026, 56(9): 1-7.