Lin Zhiyuan, Lin Chenxiao, Chen Fang, Yu Ruoxin, Xia Yonggao
College of New Energy, Ningbo University of Technology, Ningbo 315336, China.
Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Materials and Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng 475004, China.
ACS Appl Mater Interfaces. 2024 Feb 28;16(8):10692-10702. doi: 10.1021/acsami.3c17742. Epub 2024 Feb 14.
Lithium-ion batteries (LIBs) are known for their high energy density but exhibit poor cyclic stability and safety risks due to side reactions between the electrode and electrolyte. To address these issues, a novel approach involving construction of a polymer coating layer (PCL) self-polymerization using 2,2,3,4,4,4-hexafluorobutyl methacrylate (HFBM) as an electrolyte additive on the cathode is proposed. The PCL endows the electrolyte with a high onset oxidation potential (4.78 V) and lithium-ion transference number (0.52). The uniform and robust constructed PCL can effectively inhibit the severe irreversible side reactions and suppress harmful reactions, thus providing a protective barrier against degradation. The resulting Li||LiNiCoMnO batteries exhibit an improved discharge capacity retention of 80% at 1C over 100 cycles. These results demonstrate that the self-polymerization strategy holds promising potential for enhancing LIB performance and long-term stability, especially when high-voltage cathode materials are used.
锂离子电池（LIBs）以其高能量密度而闻名，但由于电极与电解质之间的副反应，其循环稳定性较差且存在安全风险。为了解决这些问题，提出了一种新方法，即在阴极上使用甲基丙烯酸2,2,3,4,4,4-六氟丁酯（HFBM）作为电解质添加剂构建聚合物涂层（PCL）进行自聚合。PCL赋予电解质高起始氧化电位（4.78 V）和锂离子迁移数（0.52）。构建的均匀且坚固的PCL可以有效抑制严重的不可逆副反应并抑制有害反应，从而提供防止降解的保护屏障。由此得到的Li||LiNiCoMnO电池在1C下100次循环后放电容量保持率提高到80%。这些结果表明，自聚合策略在提高LIB性能和长期稳定性方面具有广阔的潜力，特别是在使用高压阴极材料时。
