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Operating Highly Stable LiCoO2 Cathodes up to 4.6 V by Using an Effective Integration of Surface Engineering and Electrolyte Solutions Selection
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-16 , DOI: 10.1002/adfm.202204972 Tianju Fan 1, 2 , Wang Kai 3 , Villa Krishna Harika 1 , Cunsheng Liu 2 , Amey Nimkar 1 , Nicole Leifer 1 , Sandipan Maiti 1 , Judith Grinblat 1 , Merav Nadav Tsubery 1 , Xiaolang Liu 3 , Meng Wang 3 , Leimin Xu 3 , Yuhao Lu 3 , Yonggang Min 2 , Netanel Shpigel 1 , Doron Aurbach 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-16 , DOI: 10.1002/adfm.202204972 Tianju Fan 1, 2 , Wang Kai 3 , Villa Krishna Harika 1 , Cunsheng Liu 2 , Amey Nimkar 1 , Nicole Leifer 1 , Sandipan Maiti 1 , Judith Grinblat 1 , Merav Nadav Tsubery 1 , Xiaolang Liu 3 , Meng Wang 3 , Leimin Xu 3 , Yuhao Lu 3 , Yonggang Min 2 , Netanel Shpigel 1 , Doron Aurbach 1
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The need for high power density cathodes for Li-ion batteries can be fulfilled by application of a high charging voltage above 4.5 V. As lithium cobalt oxide (LCO) remains a dominant commercial cathode material, tremendous efforts are invested to increase its charging potential toward 4.6 V. Yet, the long-term performance of high voltage LCO cathodes still remains poor. Here, an integrated approach combining the application of an aluminum fluoride coating and the use of electrolyte solutions comprising 1:1:8 mixtures of difluoroethylene:fluoroethylene carbonate:dimethyl carbonate and 1 m LiPF6 is reported. This results in superior behavior of LCO cathodes charged at 4.6 V with high initial capacity of 223 mAh g−1, excellent long-term performance, and 78% capacity retention after 500 cycles. Impressive stability is also found at 450 °C with an initial capacity of 220 mAh g−1 and around 84% capacity retention after 100 cycles. Systematic post-mortem analysis of LCO cathodes and Li anodes after prolonged cycling reveals two main degradation routes related to changes at the surface of the cathodes and formation of passivation layers on the anodes. This study demonstrates the importance of appropriate selection of electrolyte solutions and development of effective coatings for improved performance of high voltage LCO-based Li batteries.
中文翻译：
通过有效整合表面工程和电解质溶液选择，运行高达 4.6 V 的高度稳定的 LiCoO2 阴极
锂离子电池对高功率密度正极的需求可以通过施加高于 4.5 V 的高充电电压来满足。由于钴酸锂 (LCO) 仍然是主要的商业正极材料，因此投入了巨大的努力来提高其充电潜力4.6 V。然而，高压 LCO 正极的长期性能仍然很差。在这里，报告了一种综合方法，将氟化铝涂层的应用与电解质溶液的使用相结合，该电解质溶液包含二氟乙烯：氟代碳酸亚乙酯：碳酸二甲酯和 1 m LiPF 6 的 1:1:8 混合物。这导致在 4.6 V 下充电的 LCO 正极具有优异的性能，具有 223 mAh g -1的高初始容量，优异的长期性能，500次循环后容量保持率达78%。在 450 °C 下也发现了令人印象深刻的稳定性，初始容量为 220 mAh g -1，100次循环后容量保持率约为 84%。长时间循环后对 LCO 正极和锂负极的系统事后分析揭示了与正极表面变化和负极钝化层形成相关的两条主要降解途径。This study demonstrates the importance of appropriate selection of electrolyte solutions and development of effective coatings for improved performance of high voltage LCO-based Li batteries.
更新日期：2022-06-16
中文翻译：
通过有效整合表面工程和电解质溶液选择，运行高达 4.6 V 的高度稳定的 LiCoO2 阴极
锂离子电池对高功率密度正极的需求可以通过施加高于 4.5 V 的高充电电压来满足。由于钴酸锂 (LCO) 仍然是主要的商业正极材料，因此投入了巨大的努力来提高其充电潜力4.6 V。然而，高压 LCO 正极的长期性能仍然很差。在这里，报告了一种综合方法，将氟化铝涂层的应用与电解质溶液的使用相结合，该电解质溶液包含二氟乙烯：氟代碳酸亚乙酯：碳酸二甲酯和 1 m LiPF 6 的 1:1:8 混合物。这导致在 4.6 V 下充电的 LCO 正极具有优异的性能，具有 223 mAh g -1的高初始容量，优异的长期性能，500次循环后容量保持率达78%。在 450 °C 下也发现了令人印象深刻的稳定性，初始容量为 220 mAh g -1，100次循环后容量保持率约为 84%。长时间循环后对 LCO 正极和锂负极的系统事后分析揭示了与正极表面变化和负极钝化层形成相关的两条主要降解途径。This study demonstrates the importance of appropriate selection of electrolyte solutions and development of effective coatings for improved performance of high voltage LCO-based Li batteries.
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