水热法高效除杂及煅烧修复废旧石墨

摘要石墨材料在锂离子电池中占据重要地位,如果废旧石墨能够回收和再利用,石墨资源短缺将得到缓解,这有利于新能源产业的可持续发展。针对废旧石墨的修复再生过程,侧重于不同金属杂质的不同去除方法的应用。在水热条件下对Cu和Li分别高效去除,在水浴条件下对Co、Mn和Ni同时高效去除,最后探究了不同的温度和时间对废旧石墨表面有机杂质去除的影响。针对上述得到的再生石墨,通过XRD和SEM对其进行表征分析。最后将石墨制备成纽扣电池,测试其电化学性能。结果表明:在适宜条件下,Cu、Li、Co、Mn和Ni的浸出率均超过96%。再生石墨在0.1 C的电流密度下的容量保持率为97.99%,此方法实现了废旧石墨的修复再生。

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	华伟明
	陈湘萍
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	李福涛

关键词：锂离子电池废旧石墨水热法再生石墨电化学性能

Abstract： Graphite materials occupy an important position in lithium-ion batteries (LIBs), and if spent graphite (SG) can be recycled and reused, the shortage of graphite resources will be alleviated, which is beneficial to the sustainable development of the new energy industry. For the restoration and regeneration process of SG, this study focuses on the application of different removal methods for different metal impurities. Efficient removal of Cu and Li under hydrothermal conditions, efficient removal of Co, Mn and Ni simultaneously under water bath conditions, and finally the effect of different temperature and time on the removal of organic impurities from the surface of SG was investigated. For the above obtained regenerated graphite (RG), it was characterized and analyzed by XRD and SEM. Finally, the graphite was prepared into button cells and tested for its electrochemical properties. The results show that the leaching rates of Cu, Li, Co, Mn and Ni exceed 96% under the suitable conditions. The capacity retention of RG was 97.99% at a current density of 0.1 C. This method achieved the restoration and regeneration of waste graphite.

Keywords： lithium-ion batteries spent graphite hydrothermal method regenerated graphite electrochemical properties

Received 2023-03-31;

Fund:国家自然科学基金(52074177);中央公益性科研院所基础研究经费(PM-zx703-202204-068)。

Corresponding Authors: 陈湘萍,教授,chenxiangping@sust.edu.cn。 Email: chenxiangping@sust.edu.cn

About author: 华伟明(1998—),男,硕士研究生,研究方向为废旧锂离子电池资源化回收。

引用本文:

华伟明, 陈湘萍, 汲绍文, 李福涛.水热法高效除杂及煅烧修复废旧石墨[J]. 化学工业与工程, 2025,42(2): 97-106

HUA Weiming, CHEN Xiangping, JI Shaowen, LI Futao.Hydrothermal method for efficient impurity removal and calcination repair of spent graphite[J]. Chemcial Industry and Engineering, 2025,42(2): 97-106

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