Shen Huilin, Wang Qilin, Chen Zheng, Rong Changru, Chao Danming
Key Laboratory of High-Performance Plastics, Ministry of Education, National & Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Xiuzheng Road 1788, Changchun 130012, China.
National Key Laboratory of Advanced Vehicle Integration and Control, China FAW Group Co., Ltd., Changchun 130013, China.
Materials (Basel). 2023 Jun 8;16(12):4266. doi: 10.3390/ma16124266.
The use of silicon (Si) as a lithium-ion battery's (LIBs) anode active material has been a popular subject of research, due to its high theoretical specific capacity (4200 mAh g). However, the volume of Si undergoes a huge expansion (300%) during the charging and discharging process of the battery, resulting in the destruction of the anode's structure and the rapid decay of the battery's energy density, which limits the practical application of Si as the anode active material. Lithium-ion batteries' capacity, lifespan, and safety can be increased through the efficient mitigation of Si volume expansion and the maintenance of the stability of the electrode's structure with the employment of polymer binders. The main degradation mechanism of Si-based anodes and the methods that have been reported to effectively solve the Si volume expansion problem firstly are introduced. Then, the review demonstrates the representative research work on the design and development of new Si-based anode binders to improve the cycling stability of Si-based anode structure from the perspective of binders, and finally concludes by summarizing and outlining the progress of this research direction.
由于硅（Si）具有较高的理论比容量（4200 mAh/g），将其用作锂离子电池（LIBs）的负极活性材料一直是热门的研究课题。然而，在电池的充放电过程中，硅的体积会发生巨大膨胀（300%），导致负极结构遭到破坏，电池能量密度迅速衰减，这限制了硅作为负极活性材料的实际应用。通过有效缓解硅的体积膨胀并采用聚合物粘结剂来维持电极结构的稳定性，可以提高锂离子电池的容量、寿命和安全性。首先介绍了硅基负极的主要降解机制以及据报道能有效解决硅体积膨胀问题的方法。然后，本文综述从粘结剂的角度展示了关于设计和开发新型硅基负极粘结剂以提高硅基负极结构循环稳定性的代表性研究工作，最后通过总结和概述该研究方向的进展得出结论。
