Resolving the Compositional and Structural Defects of Degraded LiNixCoyMnzO2 Particles to Directly Regenerate High-Performance Lithium-Ion Battery Cathodes,ACS Energy Letters

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Resolving the Compositional and Structural Defects of Degraded LiNixCoyMnzO2 Particles to Directly Regenerate High-Performance Lithium-Ion Battery Cathodes
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-26 00:00:00 , DOI: 10.1021/acsenergylett.8b00833
Yang Shi ₁ , Gen Chen ₂ , Fang Liu ₂ , Xiujun Yue ₁ , Zheng Chen _{1,

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Affiliation

Layered oxide LiNi_xCo_yMn_zO₂ (0 < x,y,z < 1, x + y + z = 1) or NCM is becoming the dominating cathode material in high-energy lithium-ion batteries (LIBs), which have degradation issues after cycling due to Li loss and phase changes. Directly resolving these issues to generate new cathodes cannot only reduce the high cost but also prevent environmental pollution from disposal of used LIBs. However, currently there is no effective approach to tackle this challenge. Here we demonstrate a nondestructive process to directly regenerate degraded NCM cathode particles to obtain new active particles. Using this method, nearly ideal stoichiometry, low cation mixing, and high phase purity were achieved in the regenerated NCM particles, which offer high specific capacity, good cycling stability, and high rate capability, all reaching pristine materials. Our work represents a simple yet efficient approach to directly regenerate high-performance NCM cathodes with distinct advantages over traditional hydrometallurgical methods and builds an important foundation for the sustainable manufacturing of energy materials.

中文翻译：

解决降解的LiNi _x Co _y Mn _z O ₂颗粒的组成和结构缺陷，以直接再生高性能锂离子电池正极

层状氧化物LiNi _x Co _y Mn _z O ₂（0 < x，y，z <1，x + y + z= 1）或NCM成为高能锂离子电池（LIB）的主要阴极材料，由于Li损耗和相变，在循环后NCM会出现退化问题。直接解决这些问题以产生新的阴极不仅可以降低高成本，而且还可以防止因处理废旧LIB而造成的环境污染。但是，目前没有有效的方法来应对这一挑战。在这里，我们展示了一种直接破坏降解的NCM阴极颗粒直接再生以获得新活性颗粒的非破坏性过程。使用这种方法，在再生的NCM颗粒中获得了近乎理想的化学计量，低阳离子混合和高相纯度，这些颗粒均具有高比容量，良好的循环稳定性和高倍率能力，而这些都是原始材料。

更新日期：2018-06-26

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