材料科学
石墨
涂层
电极
电流密度
复合材料
剥脱关节
纳米技术
同质性(统计学)
多孔性
碳化
化学工程
石墨烯
化学
扫描电子显微镜
物理
统计
数学
物理化学
量子力学
工程类
作者
Haoran Da,Wenhao Fang,Jiufu Zhu,Jin Li,Shanshan Pan,Jiajia Li,Jiaqi Huang,Haitao Zhang,Suojiang Zhang
出处
期刊:Small
[Wiley]
日期:2023-08-23
卷期号:19 (49)
被引量:3
标识
DOI:10.1002/smll.202304060
摘要
Abstract As spent batteries can be considered as alternative raw sources of electrode materials; the development of regeneration techniques for spent graphite becomes key to realizing economic and environmental sustainability. Herein, the reutilization of small spent graphite particles is domonstrated due to their special structural characteristics, which may directly contribute to the improvement of lithiation kinetics and high‐rate charging during long‐term cycling. Such intrinsic defects and external cracked channels may be introduced by the aging of intrinsic bulk structure and exfoliation of surface structure. On account of these potential advantages, a carbonized polypyrrole layer on sieved small graphite particles is developed to obtain superior rate performance. The coated amorphous/graphitic layer could repair the exposed edge and basal plane, and significantly facilitate Li ion diffusion during fast charging. Moreover, the enhanced performance may favor the improved homogeneity of current density distribution during fast charging, which is confirmed by a porous electrode model. The regenerated graphite with a disorder/order coating layer could effectively regulate the Li + transport channel, exhibiting a high specific capacity at high‐rate charging (102.7 mAh g −1 at 4 C after 500 cycles) without severe Li plating. This work provides an opportunity to utilize spent graphite in fast‐charging batteries.
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