Huang Chuxiong, Liang Jingxi, Xiao Huayan, Wei Xiujuan, Liu Tiefeng, Lin Zhan, Wu Shuxing
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.
ACS Appl Mater Interfaces. 2024 Nov 13;16(45):62121-62130. doi: 10.1021/acsami.4c13937. Epub 2024 Nov 5.
SiO is a highly promising anode material for realizing high-capacity lithium-ion batteries owing to its high theoretical capacity. However, the large volume change during cycling limits its practical application. The development of a binder has been demonstrated as one of the most economical and efficient strategies for enhancing the SiO anode's electrochemical performance. In this work, a multifunctional binder (T-PGA) is fabricated by cross-linking γ-polyglutamic acid (PGA) and tannic acid (TA) for SiO anodes. The introduction of TA into PGA helps to buffer the volume changes of the SiO anodes, facilitate diffusion of Li, and construct stable SEI layers. Benefiting from this proposed binder, the SiO anode maintains a reversible capacity of 973.0 mAh g after 500 cycles at 500 mA g and the full cell, pairing with LiNiCoMnO cathode, delivers a reversible capacity of 133 mA h g (73.2% retention) after 100 cycles. This study offers valuable insights into advanced binders that are used in high-performance Li-ion batteries.
由于具有高理论容量，SiO是一种极有前景的用于实现高容量锂离子电池的负极材料。然而，循环过程中的大体积变化限制了其实际应用。开发一种粘结剂已被证明是提高SiO负极电化学性能最经济有效的策略之一。在这项工作中，通过γ-聚谷氨酸（PGA）和单宁酸（TA）交联制备了一种用于SiO负极的多功能粘结剂（T-PGA）。将TA引入PGA有助于缓冲SiO负极的体积变化，促进Li的扩散，并构建稳定的固体电解质界面（SEI）层。受益于这种粘结剂，SiO负极在500 mA g下循环500次后保持973.0 mAh g的可逆容量，与LiNiCoMnO正极配对的全电池在100次循环后提供133 mA h g的可逆容量（保持率73.2%）。这项研究为高性能锂离子电池中使用的先进粘结剂提供了有价值的见解。
