| 引用本文: | 王崇国,胡生勇,金小容,徐兴莉.锂电池单晶正极材料LiNi 0.6Co 0.2Mn 0.2O2的合成与性能研究[J].材料科学与工艺,2025,33(4):63-71.DOI:10.11951/j.issn.1005-0299.20250009. |
| WANG Chongguo,HU Shengyong,JIN Xiaorong,XU Xingli.Synthesis and properties of LiNi 0.6Co 0.2Mn0.2O2 single crystal positive electrode material for lithium batteries[J].Materials Science and Technology,2025,33(4):63-71.DOI:10.11951/j.issn.1005-0299.20250009. |
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| 摘要: |
| 锂离子电池正极材料LiNi 0.6Co 0.2Mn 0.2O2(NCM622)以其优异的能量密度及稳定性备受关注。本文以NiSO4·6H2O、CoSO4·7H2O和MnSO4·H2O为原料按0.6∶0.2∶0.2化学计量比混合,通过共沉淀法制得前驱体Ni 0.6Co 0.2Mn 0.2(OH)2后,将碳酸锂和氢氧化锂作为熔融盐和锂源与前驱体混合,然后采用短期高温烧结与低温保温相结合的方法,制得了单晶NCM622正极材料；通过调节保温过程的温度,获得了NCM-L800、NCM-H750、NCM-H800、NCM-H850 4种样品,并对其形貌、结构及电化学性能进行表征分析。结果表明:NCM-H800样品锂镍混排度最低,仅为2.37%,表现出完整的层状结构,在1 C条件下循环100次容量保持率高达93.19%,表现出最佳循环稳定性；在大电流条件下,NCM-H800样品表现出了优异倍率性能。 |
| 关键词: 锂离子电池 NCM622正极材料 单晶结构 性能优化 合成方法 |
| DOI：10.11951/j.issn.1005-0299.20250009 |
| 分类号:TF815；TD92 |
| 文献标识码:A |
| 基金项目:甘肃省自然科学基金资助项目(22JR5RC1081)；甘肃省高等学校创新基金项目(2022B-519);金昌市青年人才基金项目(2022RC015). |
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| Synthesis and properties of LiNi 0.6Co 0.2Mn0.2O2 single crystal positive electrode material for lithium batteries |
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WANG Chongguo1, HU Shengyong1, JIN Xiaorong2, XU Xingli1
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(1.GanSu Vocational＆Technical College of Nonferrous, Jinchang 737100,China; 2.Jinchuan Group Nickle and Cobalt Design and Research Institute, Jinchang 737100,China)
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| Abstract: |
| The LiNi 0.6Co 0.2Mn 0.2O2 (NCM622) cathode material for lithium-ion batteries has attracted significant attention for its high energy density and stability. In this study, NiSO4 ·6H2O, CoSO4·7H2O, and MnSO4·H2O were mixed in a stoichiometric ratio of 0.6∶0.2∶0.2 as raw materials. The Ni 0.6Co 0.2Mn 0.2(OH)2 precursor was prepared by a coprecipitation method.The precursor was then combined with lithium carbonate and lithium hydroxide as molten salts and lithium sources. Single crystal NCM622 cathode material was through a two-step process involving short-term high-temperature sintering and low-temperature insulation. Four samples, NCM-L800, NCM-H750, NCM-H800, and NCM-H850, were obtained by adjusting the insulation temperature. Their morphology, crystal structure, and electrochemical properties were systematically characterized and analyzed. The results showed that the NCM-H800 sample exhibited the lowest lithium nickel miscibility (2.37%) and a well-defined layered structure.At 1 C rate, this sample demonstrated superior cycling stability with a capacity retention rate of 93.19% after 100 cycles. Additionally, under high-current conditions, NCM-H800 exhibited excellent rate capability. |
| Key words: lithium ion battery NCM622 positive electrode material single crystal structure performance optimization synthetic method |
