Saturated lithium oxalate solution for surface optimization of Ni-rich cathodes during water-washing processes

IF 4.1 3区 化学 Q1 CHEMISTRY, ANALYTICAL Journal of Electroanalytical Chemistry Pub Date : 2025-03-13 DOI:10.1016/j.jelechem.2025.119074
Chi Chen , Kangwen He , Yanwei Huang , Shuangjia Weng , Hao Zhou , Jie Zhou , Xiaoxiao Lu , Xin Geng
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Abstract

Water-washing is routinely employed in industry to remove the residual lithium compounds (RLCs) from the solid-state synthesized Ni-rich layered cathodes. However, these processes remain controversial, including potential damage to the surface structure with phase transformation and then reduce specific capacity. In this work, saturated lithium oxalate solution is used as an alternative to deionized water for treating the LiNi0.8Co0.1Mn0.1O2 (NCM) cathodes. Compared to traditional washing strategies, samples exhibit significantly improved electrochemical performances. The saturated lithium oxalate solution washed samples (NCM-LC) achieve a significantly improved discharge capacity of 211.2 mAh g−1 at 0.1C with an initial Coulombic efficiency (ICE) of 89.99 %, and present a good capacity retention of 84.47 % after 500 cycles at 3–4.3 V. By contrast the water washed samples (NCMW) present reduced initial discharge capacity of 182.5 mAh g−1 and then rapidly decay to 110.55 mAh g−1 after 200 cycles, the capacity retention is only 62.35 %. It is found that the saturated lithium oxalate suppresses the formation of NiOOH compounds on the sample surface, thus inhibiting the formation of NiO rock-salt phase. Furthermore, a protective coating can be formed on the sample surface after these treatments, which further improving the surface chemical stability and structural integrity of samples. This work offers a promising strategy for removing RLCs, which exert minimal impact on the electrochemical performances of Ni-rich layered cathodes.

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CiteScore
7.80
自引率
6.70%
发文量
912
审稿时长
2.4 months
期刊介绍: The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
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