| 正极材料LiNi0.8Mn0.2O2前驱体合成工艺的探究 |
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| 引用本文： | 胡顺,夏鼎峰,邹金,钟盛文.正极材料LiNi0.8Mn0.2O2前驱体合成工艺的探究[J].有色金属科学与工程,2022,13(4):70-79. |
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| 作者姓名： | 胡顺 夏鼎峰 邹金 钟盛文 |
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| 作者单位： | a.江西理工大学材料科学与工程学院, 江西 赣州 341000 |
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| 基金项目： | 国家自然科学基金资助项目51874151 |
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| 摘 要： | 成本低、性能稳定的无钴镍锰正极材料是目前的研究热点。采用共沉淀法制备Ni0.8Mn0.2(OH)2前驱体, 用氨水作为络合剂, 探究了NH3浓度对前驱体Ni0.8Mn0.2(OH)2共沉淀的晶粒生长和形貌的影响, 以及对锂离子电池正极材料LiNi0.8Mn0.2O2的晶体结构和电化学性能的影响。通过X射线衍射仪、扫描电镜、循环伏安测试、交流阻抗和电池充放电测试系统表征材料的结构、形貌和电化学性能。表征结果显示, 在0.1 C, 2.5~4.2 V化成条件下, 初始放电比容量为167 mAh/g, 充放电效率为96%。当氨水用量为45 mL时, 样品具有较优的循环性能, 在1 C倍率下, 2.5~4.2 V的电压测试范围内, 循环100次后, 放电比容量为139 mAh/g, 容量保持率为93.9%。在低倍率充放电条件下样品具有明显优于其他材料的电化学性能。
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| 关 键 词： | 共沉淀法 氨水 LiNi0.8Mn0.2O2 |
| 收稿时间： | 2022-02-22 |
Research on the synthesis process of cathode material LiNi0.8Mn0.2O2 precursor |
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| Affiliation: | a.School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, Chinab.Jiangxi Key Laboratory of Power Battery and Materials, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China |
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| Abstract: | Currently, the low cost and stable performance of cobalt-free nickel manganese cathode materials is a research hotspot. This study prepared a Ni0.8Mn0.2(OH)2 precursor through a coprecipitation method, used ammonia as a complexing agent and explored the effect of NH3 concentration on the grain growth and morphology of the coprecipitated Ni0.8Mn0.2(OH)2 precursor, as well as its effect on the crystal structure and electrochemical properties of LiNi0.8Mn0.2O2 of the cathode material for lithium ion batteries. The structure, morphology and electrochemical properties of the materials were characterized by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, AC impedance and battery charge discharge tests. The characterization results showed that at 0.1 C rate with 2.5~4.2 V the initial specific discharge capacity was 167 mAh/g with the charge-discharge efficiency 96%. When the amount of ammonia was 45 mL, the sample had the best cycle performance. At a 1 C rate of 2.5~4.2 V, after 100 cycles, the specific discharge capacity was 139mAh/g with the capacity retention 93.9%. The samples had significantly better electrochemical properties than other materials when the charge and discharge rate was low. |
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