电解质
阳极
表面改性
哌啶
阳离子聚合
化学工程
分解
电化学
化学
碳纤维
材料科学
高分子化学
有机化学
复合材料
物理化学
电极
复合数
工程类
作者
Jiaqi Meng,Guofeng Jia,Hongjun Yang,Faman Tang,Zhengjun Peng,Jianwei Li,Min Wang
标识
DOI:10.1002/cnma.202300185
摘要
Abstract The formation of a stable SEI with a hierarchical structure of functionalization is the key to improving the anode performance of secondary batteries. The effects of piperidine cation containing isobutyl as an additive in the SEI structure of hard carbon (HC) and corresponding Na + transport functionality were comprehensively investigated. It is revealed that the large cationic groups of piperidine can promote the rapid migration of Na + desolvation on the surface of HC anode, further promote the decomposition of anions, and induce the formation of a double‐layer SEI structure. As a result, the as‐fabricated batteries achieved high cyclic stability, good reversible specific capacity, and improved rate performance. The mixed electrolyte showed good reversible capacity and capacity retention rate (800 cycles @5 C, 67.31%), which was significantly better than the initial electrolyte with a capacity retention rate of 42.01% for 500 cycles @5 C. In particular, it is also observed some graphitized structural features on the surface of HC, which facilitate the migration of Na + . Meanwhile, the hierarchical structure of functionalization SEI in conjunction with “pseudo‐SEI” contributed to the improved performance of Na + storage. This work provides the feasibility for the introduction of large cationic group additives in the electrolyte to enhance the cycle stability of the HC anode.
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