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Multifunctional Ho2O3 Coating with Oxygen Vacancies Enables High-Performance Lithium-Rich Layered Oxide Cathodes
Energy & Fuels ( IF 5.2 ) Pub Date : 2024-03-27 , DOI: 10.1021/acs.energyfuels.4c00535 Da Zhang 1 , Di Zhang 1 , Chaoliang Zheng 1 , Jianjian Zhong 1 , Jianling Li 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2024-03-27 , DOI: 10.1021/acs.energyfuels.4c00535 Da Zhang 1 , Di Zhang 1 , Chaoliang Zheng 1 , Jianjian Zhong 1 , Jianling Li 1
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Li-rich materials with exceptionally high specific capacity have great potential for the commercialization of cathode materials in the future. However, irreversible oxygen loss, transition metal (TM) dissolution, and structural degradation during cycling make the commercialization of Li-rich cathode materials difficult. Here, a uniform Ho2O3 coating was formed on the surface of Li-rich layered oxide (LLO) cathodes due to the good electrical conductivity and abundant oxygen vacancies of Ho2O3. The high conductivity of the material improves the kinetic performance. The modification layer effectively stabilizes the evolution of CEI during the long cycling process and inhibits the occurrence of irreversible side reactions. More importantly, the abundant oxygen vacancies effectively inhibited oxygen precipitation and enhanced the reversibility of anion redox. The charging and discharging processes of the material and the modification mechanism are deeply analyzed through a series of characterizations. The results show that the modification method effectively improves the electrochemical performance of the materials. The capacity loss of the Ho2O3-coated material is less than that of LLO after long cycling at 1C and 0.5C, and the discharge-specific capacity of the modified material can be increased to 158.1 mAh g–1 at 5C. This paper provides a new guiding path for the design of future high-voltage LLO materials.
中文翻译：
具有氧空位的多功能 Ho2O3 涂层可实现高性能富锂层状氧化物阴极
具有极高比容量的富锂材料在未来正极材料的商业化方面具有巨大潜力。然而，循环过程中不可逆的氧损失、过渡金属（TM）溶解和结构降解使得富锂正极材料的商业化变得困难。在此，由于Ho 2 O 3良好的导电性和丰富的氧空位，在富锂层状氧化物（LLO）正极表面形成了均匀的Ho 2 O 3涂层。材料的高电导率提高了动力学性能。改性层有效稳定了长循环过程中CEI的演变，抑制不可逆副反应的发生。更重要的是，丰富的氧空位有效抑制了氧沉淀，增强了阴离子氧化还原的可逆性。通过一系列的表征，深入分析了材料的充放电过程和改性机理。结果表明，该改性方法有效提高了材料的电化学性能。 Ho 2 O 3包覆材料在1C和0.5C下长循环后的容量损失小于LLO，且改性材料在5C下的放电比容量可提高至158.1 mAh g –1。本文为未来高压LLO材料的设计提供了新的指导路径。
更新日期：2024-03-27
中文翻译：
具有氧空位的多功能 Ho2O3 涂层可实现高性能富锂层状氧化物阴极
具有极高比容量的富锂材料在未来正极材料的商业化方面具有巨大潜力。然而，循环过程中不可逆的氧损失、过渡金属（TM）溶解和结构降解使得富锂正极材料的商业化变得困难。在此，由于Ho 2 O 3良好的导电性和丰富的氧空位，在富锂层状氧化物（LLO）正极表面形成了均匀的Ho 2 O 3涂层。材料的高电导率提高了动力学性能。改性层有效稳定了长循环过程中CEI的演变，抑制不可逆副反应的发生。更重要的是，丰富的氧空位有效抑制了氧沉淀，增强了阴离子氧化还原的可逆性。通过一系列的表征，深入分析了材料的充放电过程和改性机理。结果表明，该改性方法有效提高了材料的电化学性能。 Ho 2 O 3包覆材料在1C和0.5C下长循环后的容量损失小于LLO，且改性材料在5C下的放电比容量可提高至158.1 mAh g –1。本文为未来高压LLO材料的设计提供了新的指导路径。
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