一种多功能氨基酸可以直接回收使用的LiFePO4阴极材料
Di Tang1, Guanjun Ji1,2, Junxiong Wang1,2
1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Advanced materials (Deerfield Beach, Fla.)
|November 27, 2023
概括
回收退役的铁酸盐 (LFP) 电池至关重要. 一种新方法使用L-氨酸再生LFP,提高其电化学性能,并使大规模的电池回收.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 可持续化学 可持续化学
背景情况:
- 铁酸盐 (LiFePO,LFP) 电池对于电动汽车和储能至关重要.
- 越来越多的退役LFP电池需要环保和高效的回收方法.
- 降解问题,如FePO4阶段和Li-Fe抗站缺陷限制LFP电池的寿命.
研究的目的:
- 为退役的LFP电池制定直接再生战略.
- 为LFP电池回收利用一种天然且低成本的减少剂L-threonine.
- 提高回收LFP的电化学性能和循环稳定性.
主要方法:
- 采用L-氨酸作为一种多功能减脂剂,利用其基和氨基群.
- 创建了一个可减少的环境,以将FePO4转换为LFP,并消除Li-Fe反站点缺陷.
- 促进了N-doping进入碳层,以提高导电性和活性点.
- 使用电化学性能测试 (例如,1C,5C循环) 测试再生的LFP.
主要成果:
- 成功再生了LFP材料,提高了电化学性能.
- 在1°C下达到147.9mAh的放电容量,在5°C下500个循环后保持了86%的容量.
- 证明了工业采购LFP黑质量的方法的可行性.
结论:
- 氨酸是一种有效的,环保的减少剂,用于直接LFP电池再生.
- 拟议的方法重建Li+扩散通道并提高导电性.
- 这种方法显示了LFP电池大规模回收的巨大潜力.
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