废尖晶石正极材料的绿色修复途径:机械化学与固相反应的耦合

IF 42.9 Q1 ELECTROCHEMISTRY
Jiao Lin , Xu Chen , Ersha Fan , Xiaodong Zhang , Renjie Chen , Feng Wu , Li Li
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引用次数: 1

摘要

为了应对环境污染和资源消耗,需要一种直接修复废旧锂离子电池正极材料的方法。在这项工作中,我们报道了一种涉及机械化学和固态反应的废旧锂离子电池绿色修复方法。在球磨修复过程中,添加的锰源进入降解的LiMn2O4(LMO)晶体结构,以填补由于Jahn–Teller效应导致的Mn缺乏所形成的Mn空位,从而修复LMO的化学组成。添加的碳源不仅可以作为润滑剂,还可以作为导体来提高材料的导电性。同时,机械力降低了LMO颗粒的晶体尺寸,增加了电化学反应的活性位点的数量。Jahn–Teller畸变被LMO材料中的阳离子无序成功抑制。由此,修复后的阴极材料的循环稳定性和倍率性能大大提高,放电比容量是商业LMO的两倍以上。所提出的固态机械化学原位修复工艺对环境安全且使用简单,可扩展到其他废料的修复,而无需消耗高酸性或碱性化学试剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A green repair pathway for spent spinel cathode material: Coupled mechanochemistry and solid-phase reactions

A green repair pathway for spent spinel cathode material: Coupled mechanochemistry and solid-phase reactions

A way of directly repairing spent lithium-ion battery cathode materials is needed in response to environmental pollution and resource depletion. In this work, we report a green repair method involving coupled mechanochemistry and solid-state reactions for spent lithium-ion batteries. During the ball-milling repair process, an added manganese source enters into the degraded LiMn2O4 (LMO) crystal structure in order to fill the Mn vacancies formed by Mn deficiency due to the Jahn–Teller effect, thereby repairing the LMO's chemical composition. An added carbon source acts not only as a lubricant but also as a conductor to improve the material's electrical conductivity. Meanwhile, mechanical force reduces the crystal size of the LMO particles, increasing the amount of active sites for electrochemical reactions. Jahn–Teller distortion is successfully suppressed by cation disorder in the LMO material. The cycling stability and rate performance of the repaired cathode material are thereby greatly improved, with the discharge specific capacity being more than twice that of commercial LMO. The proposed solid-state mechanochemical in situ repair process, which is safe for the environment and simple to use, may be extended to the repair of other waste materials without consuming highly acidic or alkaline chemical reagents.

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CiteScore
33.70
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