揭示消耗LiFePO的直接再生中的剩余电荷效应4
Changrui Lu1, Yang Cao1,2, Junfeng Li2,3
1School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China.
Angewandte Chemie (International ed. in English)
|December 9, 2025
概括
使用过的离子电池的安全粉碎产生不完全放电的LiFePO4 (IDS-LFP). 这项研究表明,与完全放电的LFP (FDS-LFP) 相比,IDS-LFP的再生效率很低,这影响了电池回收效率.
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
- 可持续能源 可持续能源
背景情况:
- 安全的粉碎技术在回收过程中增加了不完全放电的离子电池 (IDS-LFP).
- IDS-LFP和完全排放的消耗LiFePO4 (FDS-LFP) 具有不同的微观结构和特性.
- 目前的再生研究主要集中在FDS-LFP,忽视了IDS-LFP再生.
研究的目的:
- 根据物理化学特性对FDS-LFP和IDS-LFP进行分类.
- 调查FDS-LFP和IDS-LFP的再生过程中的差异.
- 了解剩余电荷和再生效率之间的关系.
主要方法:
- 使用过的LiFePO4 (S-LFP) 的分类为FDS-LFP和IDS-LFP.
- 在两种S-LFP类型中应用三种不同的再生方法.
- 对再生后微观结构和物理化学性质变化的分析.
主要成果:
- 由于大量空缺,IDS-LFP显示了较高的介质能量障碍.
- 再生IDS-LFP (IDR-LFP) 的FeLi抗位点缺陷比例 (1.3%) 比再生FDS-LFP (FDR-LFP) 的 (0.6%) 高.
- 在400个循环后,FDR-LFP实现了137.1 mAh g−1 (1C),容量保留率为81.5%,而IDR-LFP仅达到105.1 mAh g−1 (1C).
结论:
- 由于固有的缺陷,IDS-LFP不能完全再生.
- 剩余电荷显著影响使用过的LiFePO4.4的再生效率和性能.
- 这项研究为管理S-LFP提供了关键的见解,其中包括在回收过程中存在不同的残留负荷.
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