| 乔华丽,李玉丹.废旧隔膜衍生碳对回收石墨锂电性能的协同提升研究[J].中国造纸,2025,44(9):57-64 |
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| 废旧隔膜衍生碳对回收石墨锂电性能的协同提升研究 |
| Waste‐Separator‐Derived Carbon and Its Synergistic Enhancement of Recycled Graphite for Lithium‐Ion Batteries |
| 收稿日期：2025-05-19 修订日期：2025-07-02 |
| DOI：10.11980/j.issn.0254-508X.2025.09.008 |
| 关键词: 废旧隔膜衍生碳 锂离子电池回收 回收石墨 复合电极 |
| Key Words:waste separator‐derived carbon lithium‐ion battery recycling recycled graphite composite electrode |
| 基金项目:河南省教育厅教学质量工程项目（豫教［2022］38693）；教育部高等教育司协同育人项目（220902557050855）。 |
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| 摘要:本研究提出了一种将废旧锂离子电池拆解所得聚烯烃隔膜升级转化为高附加值碳材料的高效策略。结果表明，所得隔膜衍生碳呈现有序-无序共存的层状结构，作为负极材料时，在100 mA/g电流密度下实现了695 mAh/g的放电比容量，超过回收石墨的2倍以上。尽管碳化过程的转化效率及产物收率尚需优化，其卓越的电化学储锂性能即便在少量掺入时，也能显著提升回收石墨的容量。基于回收石墨与隔膜衍生碳的复合电极，展现出更优异的锂离子扩散特性和容量稳定性：在0.5 C倍率下循环1 200次后，复合材料仍保持380 mAh/g的稳定放电比容量，而单一回收石墨仅为285 mAh/g。 |
| Abstract:This study proposed an efficient strategy for upgrading polyolefin separators obtained from the disassembly of scrap lithium-ion batteries into high-value carbon materials. The results indicated that the separator-derived carbon exhibits a layered structure with the coexistence of ordered and disordered regions. When used as an anode material， it achieved a specific capacity of 695 mAh/g at a current density of 100 mA/g， exceeding twice that of recycled graphite. Although the conversion efficiency and product yield of the carbonization process still need optimization， its exceptional electrochemical lithium storage performance significantly enhanced the capacity of recycled graphite even with a small amount of addition. The composite electrode based on recycled graphite and separator-derived carbon demonstrates superior lithium-ion diffusion characteristics and capacity stability： after 1 200 cycles at a 0.5 C rate， the composite material maintained a stable discharge capacity of 380 mAh/g， while the single recycled graphite only achieved 285 mAh/g. |
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