定向场所诱导的反铁磁合稳定了使用过的离子电池重建的阴极
Chenzhaosha Li1, Yujia He1, Weiping Li1
1School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Engineering Research Center of Energy Storage Materials and Chemistry, Universities of Shaanxi Province, Xi'an Jiaotong University, Xi'an, China.
Angewandte Chemie (International ed. in English)
|February 11, 2026
概括
直接再生消耗的分层三元氧化物阴极可以提高可持续性. 这项研究通过控制Ni-O杂交来稳定再生的NCM阴极,显著提高了它们的长期耐用性,并使循环电池制造成为可能.
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
- 可持续制造 可持续制造 可持续制造
背景情况:
- 消耗的分层三元氧化物阴极的直接再生对于资源回收和循环电池生产至关重要.
- 这些阴极的长期稳定性受到内在电子相互作用的限制,特别是Ni迁移和岩盐相形成,导致容量退化.
研究的目的:
- 通过控制 Ni-O 轨道杂交来稳定再生的 LiNi0.5Co0.2Mn0.3O2 (NCM) 阴极.
- 调查空缺在诱导晶格应力和调节再生过程中的电子相互作用中的作用.
- 为了提高再生NCM阴极材料的循环耐用性.
主要方法:
- 在消耗的NCM中利用先前存在的Li空缺,在再生过程中创建局部化的晶格应力场.
- 调节桥接O离子的自旋配置,以诱导Ni离子和O离子之间的反铁磁合.
- 分析Ni-O轨道杂交的过渡,从π主导到σ主导的相互作用.
主要成果:
- 经过再生的NCM阴极表现出过渡到强大的s-主导的Ni-O轨道杂交,具有增强的共价性质.
- 加强的结合框架有效地抑制了Ni在循环过程中的迁移和缺陷传播.
- 在750个循环后,再生的NCM阴极保留了大约60%的初始容量.
结论:
- 使用过的NCM阴极的直接再生可以通过控制局部价值键演变来稳定.
- 这些发现为稳定再生阴极材料和提高循环可逆性提供了新的设计原则.
- 这种方法有助于可持续的资源回收和循环电池制造.
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