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为解决NCM811正极材料的缺陷性，本文采用缓冲沉淀法制备镍钴锰镁铁（NCMMF）和镍钴锰镁钛（NCMMT）两种高熵氧化物，并采用表面包覆策略对NCM811进行表面改性，系统研究其在2%包覆量下的包覆效果、电化学性能和界面稳定性。XRD检测显示，包覆后材料均呈现NCM811型层状结构，其晶胞参数小幅增加，且晶体结构仍保持良好的完整性；EDS和SEM检测结果表明，2%NCMMT包覆的NCM811材料包覆均匀、团聚少，并表现出优异的电化学性能：首次放电比容量为171.30 mAh/g，50次循环后容量保持率达96.44%，且在10 C高倍率下仍具有较高的容量保持能力；电化学阻抗测试显示其电荷传递阻抗（Rct），2%NCMMT（68.72 Ω）相比未包覆NCM811的(96.38 Ω)更低，表明2%NCMMT包覆改性后界面反应动力学更优，抑制NCM811表面副反应效果更好。相比之下，2%NCMMF包覆层存在分布不均问题，性能改善有限。本研究证实高熵氧化物NCMMT包覆可有效抑制界面副反应、提升结构稳定性，为高镍正极材料的性能优化提供了可行路径。
Abstract：To address the inherent deficiencies of NCM811 cathode materials， this study employs a buffered precipitation method to synthesize two high-entropy oxides， namely nickel-cobalt-manganese-magnesium-iron (NCMMF) and nickel-cobalt-manganese-magnesium-titanium (NCMMT). A surface coating strategy is then applied to modify NCM811， and the coating effectiveness， electrochemical performance， and interfacial stability at a coating amount of 2% are systematically investigated. XRD analysis indicated that all the coated materials exhibited an NCM811-type layered structure. After coating， the unit cell parameters of NCM811 increased slightly， while the crystalline structure still maintained good integrity. Results from EDS and SEM indicated that the NCM811 material coated with 2% NCMMT showed uniform coating， minimal agglomeration， and excellent electrochemical performance: it delivered an initial discharge specific capacity of 171.30 mAh/g， a capacity retention rate of 96.44% after 50 cycles， and retained high capacity even at a high rate of 10 C.EIS tests demonstrated that the charge transfer resistance (Rct) of NCM811 coated with 2% NCMMT was 68.72 Ω， which was lower than that of uncoated NCM811 (96.38 Ω). This indicates that the 2% NCMMT coating modification endowed better interfacial reaction kinetics and a more effective inhibition of side reactions on the NCM811 surface. In contrast， the 2% NCMMF coating layer suffered from uneven distribution， leading to limited improvement in performance.This study confirms that the coating of high-entropy oxide NCMMT can effectively suppress interfacial side reactions and enhance structural stability， which provides a feasible approach for the performance optimization of high-nickel cathode materials.
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基本信息:
中图分类号:TB321;TM912
引用信息:
[1]谭梦映,农艳馨,林海,等.高熵氧化物包覆改性NCM811的研究[J].电池工业().
基金信息:
广西重点研发计划项目(桂科AB22035053); 广西科技计划项目(桂科AD20297139); 柳东新区科技计划项目(柳东科攻20210111); 广西科技师范学院自治区级大学生创新创业训练计划项目资助（S202511546060）
2026-07-21
2026-07-21
2026-07-21