| P2型层状钠离子电池正极材料的研究 |
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| 引用本文： | 李婷婷,钟盛文,周苗苗,黄吉丽.P2型层状钠离子电池正极材料的研究[J].有色金属科学与工程,2020,11(2):82-88. |
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| 作者姓名： | 李婷婷 钟盛文 周苗苗 黄吉丽 |
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| 作者单位： | a.江西理工大学,材料冶金化学学部，江西 赣州 341000 |
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| 摘 要： | 采用溶胶-凝胶法合成前驱体, 再结合高温固相法得到P2型层状结构钠离子电池正极材料Na0.5Ni0.25Mn0.75O2, 并研究该材料的最佳制备条件。研究结果表明, 在空气气氛下900℃煅烧16h制备的材料具有最佳的性能。电镜结果显示结构呈现P2型层状结构、形貌呈现为片状, 粒径大小均匀。电化学性能显示, 1.5~4.2V电压范围内, 在0.1C电流下, 首次放电比容量达到205mAh/g, 首次充放电效率达99.86%, 且循环性能良好, 循环60次后容量达到130mAh/g, 充放电效率为100%, 容量保持率约为65%。
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| 关 键 词： | 溶胶-凝胶法 正极材料 Na0.5Ni0.25Mn0.75O2 电化学性能 |
| 收稿时间： | 2019-10-31 |
Research on P2-type layered cathode materials for sodium-ion batteries |
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| Affiliation: | a.Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology, Ganzhou 341000, Chinab.Jiangxi Key Laboratory of Power Battery and Materials,Jiangxi University of Science and Technology, Ganzhou 341000, China |
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| Abstract: | The precursor was synthesized by sol-gel method, and then Na0.5Ni0.25Mn0.75O2, the P2-type layered positive electrode material for sodium-ion batteries was obtained by high temperature solid phase method. The optimal preparation conditions of the materials were studied.The results showed that the materials prepared by calcinations in ambient atmosphere at 900 ℃ for 16h had the best performance. The results of electron microscope showed that the materials were with a P2-type layered structure, a lamellar morphology, and particles in uniform size. Tests on the electrochemical performance showed that the specific capacity of the first discharge could reach 205 mAh/g and that the initial charge-discharge efficiency was 99.86% at 0.1 C within the voltage range of 1.5~4.2 V. After 60 cycles, the capacity could reach 130 mAh/g and the charge-discharge efficiency was 100%, keeping a capacity retention rate of nearly 65%, and demonstrating good recycling performance. |
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