Electrochemical methods for the removal of impurities from thegraphite anode in spent ternary lithium-ion batteries

IF 5.7 3区 材料科学 Q2 Materials Science
Rui Zhang , Yong Tian , Wei-li Zhang , Jia-yin Song , Jie Min , Bo Pang , Jian-jun Chen
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Abstract

The use of lithium-ion batteries (LIBs) is becoming increasingly widespread, and a large number are reaching their end of life. The recycling and re-use of spent LIBs has attracted great attention. Because of the unchanged layer structure of the graphite anode in these batteries, their recycling does not require high-temperature graphitization, and only focuses on the removal of internal impurities. We used electrochemical treatment for the deep removal of internal metal impurities after the heat treatment, ultrasonic separation, and acid leaching of spent graphite. By comparing and analyzing the graphite in different recovery stages, it was found that the presence of organic impurities seriously affects the electrochemical performance. The presence of trace inorganic impurities such as Cu and Fe has little effect on the initial discharge specific capacity, but reduces the cycling stability of graphite. The content of the main metal impurities in the final recycled graphite was less than 20 mg/kg. The discharge specific capacity reached358.7 mAh/g at 0.1 C, and the capacity remained at 95.85% after 150 cycles. Compared with the reported methods for recycling spent graphite, this method can efficiently remove impurities in the graphite, solve the current problems of high acid and alkali consumption, incomplete impurity removal and high energy consumption. The recycled graphite anode has a good electrochemical performance. Our work provides a new recycling and regeneration path for spent LIB graphite anodes.

去除废旧三元锂离子电池石墨负极中杂质的电化学方法
锂离子电池(LIB)的使用越来越广泛,大量电池即将报废。废旧锂离子电池的回收和再利用引起了人们的极大关注。由于这些电池中的石墨负极层结构不变,因此其回收利用不需要高温石墨化,只需要去除内部杂质即可。在对废石墨进行热处理、超声波分离和酸浸后,我们采用电化学处理方法深度去除内部金属杂质。通过对比分析不同回收阶段的石墨,发现有机杂质的存在严重影响了电化学性能。痕量无机杂质(如 Cu 和 Fe)的存在对初始放电比容量影响不大,但会降低石墨的循环稳定性。最终再生石墨中主要金属杂质的含量小于 20 mg/kg。放电比容量在 0.1 C 时达到 358.7 mAh/g,循环 150 次后容量保持在 95.85%。与已报道的废石墨回收方法相比,该方法能有效去除石墨中的杂质,解决了目前废石墨酸碱消耗高、杂质去除不彻底、能耗高等问题。回收后的石墨阳极具有良好的电化学性能。我们的工作为废 LIB 石墨阳极的回收和再生提供了一条新的途径。
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来源期刊
New Carbon Materials
New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.10
自引率
8.80%
发文量
3245
审稿时长
5.5 months
期刊介绍: New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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