Recycling of lithium-ion battery anodes has become a topic of interest due to the retirement of batteries. However, existing recycling methods have either been environmentally unfriendly or lacked high purity levels. Here, a simple and low-cost recycling method is developed. Firstly, organic matter in graphite is eliminated through heat treatment. The removal of metal impurities in graphite is then carried out by utilizing sulfuric acid (HSO) leaching. Lastly, potassium hydroxide (KOH) etching is utilized to restore the structural defects of graphite. This comprehensive process enhances the cycling stability and rate capability of graphite. The initial discharge capacity at 0.1 C can reach a specific capacity of 422.42 mAh/g, and the specific capacity of the discharge after 100 cycles is 365.97 mAh/g, which reaches the standard of commercial graphite (CG). The results demonstrate that the method effectively purifies and regenerates waste graphite (WG). This process can alleviate resource pressure while being suitable for industrial applications due to its simplicity and low cost.

中文翻译：

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一种从废旧锂离子电池中再生石墨阳极的简便方法

由于电池报废，锂离子电池负极的回收已成为人们关注的话题。然而，现有的回收方法要么不环保，要么缺乏高纯度。在这里，开发了一种简单且低成本的回收方法。首先，通过热处理消除石墨中的有机物。然后利用硫酸（HSO）浸出去除石墨中的金属杂质。最后，利用氢氧化钾（KOH）蚀刻来恢复石墨的结构缺陷。这种综合工艺提高了石墨的循环稳定性和倍率能力。 0.1 C首次放电容量可达422.42 mAh/g的比容量，100次循环后放电比容量为365.97 mAh/g，达到商用石墨（CG）的标准。结果表明，该方法有效地净化并再生了废弃石墨（WG）。该工艺简单、成本低，可以缓解资源压力，适合工业应用。