A Physically Cross-Linked Hydrogen-Bonded Polymeric Composite Binder for High-Performance Silicon Anodes,ACS Applied Energy Materials

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A Physically Cross-Linked Hydrogen-Bonded Polymeric Composite Binder for High-Performance Silicon Anodes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-09-17 , DOI: 10.1021/acsaem.1c01849
Yongjing Hu ₁ , Dan Shao ₂ , Yutong Chen ₁ , Jianping Peng ₁ , Shuqi Dai ₁ , Mingjun Huang _{1,

3} , Zi-Hao Guo _{1,

3} , Xiangyi Luo ₂ , Kan Yue _{1,

3}

Affiliation

High-capacity silicon (Si) anodes in lithium-ion batteries require functional binders to accommodate the dramatic volume change and to improve the long-term stability during the charge/discharge cycles. Herein, a physically cross-linked hydrogen-bonded polymeric complex is reported and employed as an efficient binder for high-performance Si anodes. Composed of a blend of two commercially available polymers, poly(acrylic acid) (PAA) and poly(ethylene oxide) (PEO), the proposed PAA–PEO binders are synthesized via the solution mixing process. It is revealed that PEO brings in better elasticity and ionic conductivity, but at the expense of lower adhesion properties. With an optimized composition, the PAA–PEO binders show better cycling performance for Si anodes than the pure PAA binder. This study would provide insights for the design of low-cost and efficient binder for electrode materials with huge volume changes.

中文翻译：

用于高性能硅阳极的物理交联氢键聚合物复合粘合剂

锂离子电池中的高容量硅 (Si) 负极需要功能性粘合剂来适应剧烈的体积变化并提高充电/放电循环期间的长期稳定性。本文报道了一种物理交联的氢键聚合物复合物，并将其用作高性能硅负极的有效粘合剂。由两种市售聚合物聚（丙烯酸）（PAA）和聚（环氧乙烷）（PEO）的混合物组成，所提出的 PAA-PEO 粘合剂是通过溶液混合过程合成的。结果表明，PEO 带来了更好的弹性和离子电导率，但以较低的粘附性能为代价。通过优化的成分，PAA-PEO 粘合剂比纯 PAA 粘合剂显示出更好的 Si 负极循环性能。

更新日期：2021-10-25

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