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A low-carbon strategy for revival of degraded single crystal LiNi0.6Co0.2Mn0.2O2

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Abstract

Single crystal LiNi0.6Co0.2Mn0.2O2 is currently widely used due to the outstanding cycle stability and safety. However, its sensitivity to the environment and the high residual alkali makes the electrochemical performance and processing property severely degraded after long-term storage, especially for the Ni-rich single crystal material. Therefore, it is highly urgent to develop a cost-effective strategy for the revival of degraded Ni-rich cathode materials. Here, a low-carbon strategy is proposed to revive the degraded single crystal LiNi0.6Co0.2Mn0.2O2 (SCNCM622) through water washing. The solid–liquid reaction mechanism of SCNCM622 and water was revealed and the strong dependence of the recovery effect on the washing time was clarified. Under optimized conditions, the sample with a washing time of 24 h shows 31.2% reduction in viscosity, 18.4% improvement in discharge capacity, 15.3% enhancement in cycle life, and excellent rate performance compared to the blank sample. Therefore, this strategy can achieve higher utilization of single crystal Ni-based cathode materials with a lower cost.

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摘要

单晶LiNi0.6Co0.2Mn0.2O2正极材料的无晶界特性赋予其杰出的循环性与安全性, 因而在高性能锂离子动力电池领域获得广泛采用。然而, 小粒径与高残碱共同导致的表面高敏感性使其在长期储存后的电化学性能和加工性能面临严重退化, 尤其是应用于超高比能量密度的单晶富镍材料体系。因此, 迫切需要开发一种简单有效且成本可控的策略来修复失效的单晶富镍正极材料。本文提出了一种基于水洗且面向工业应用的低碳策略来 “再生”存储劣化的单晶LiNi0.6Co0.2Mn0.2O2 (SCNCM622)正极材料。阐明了SCNCM622与水的固液反应机制, 并且明确了劣化单晶正极材料性能修复效果与洗涤时长的强依赖关系。优化条件下, 即经过24小时洗涤后, 劣变样品的浆料粘度降低了31.2%, 放电容量提升了18.4%, 循环寿命提高了15.3%, 并展现出优异的倍率性能。因此, 该策略有望实现单晶镍基正极材料的 “降本增效”。

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Acknowledgements

This work was financially supported by the Science, Technology, and Innovation Commission of Shenzhen Municipality (No. JCYJ20180508151856806), the National Natural Science Foundation of China (No. 51974256), the Outstanding Young Scholars of Shaanxi (No. 2019JC-12), the Key R&D Program of Shanxi (No. 2019ZDLGY04-05), the National Natural Science Foundation of Shaanxi (Nos. 2019JLZ-01 and 2019JLM-29), the Fundamental Research Funds for the Central Universities (Nos. 19GH020302 and 3102019JC005).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Kai Yuan, Rui-Qi Ning, Li-Jiao Zhou, Chao Shen, Ting Jin & Ke-Yu Xie

  2. Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Northwestern Polytechnical University, Shenzhen, 518057, China

    Chao Shen & Ke-Yu Xie

  3. Wuhan Institute of Marine Electric Propulsion, China Shipbuilding Industry Corporation, Wuhan, 430064, China

    Rui-Qi Ning, Si-Si Zhou & Xiang-Gong Zhang

  4. State Key Laboratory of Environment-Friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China

    Jing Li

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Yuan, K., Ning, RQ., Zhou, LJ. et al. A low-carbon strategy for revival of degraded single crystal LiNi0.6Co0.2Mn0.2O2. Rare Met. 42, 459–470 (2023). https://doi.org/10.1007/s12598-022-02147-2

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