溶胶-凝胶法制备条件对Li1.2Mn0.54Ni0.13Co0.13O2电化学性能的影响

摘要

以柠檬酸为螯合剂，采用溶胶-凝胶法通过调节煅烧温度和陈化时间制备了不同粒径的富锂正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂。结果表明材料的粒径随煅烧温度增加，逐渐增大；随着陈化时间的增加，呈现先增大后变小的趋势。当煅烧温度为850℃，陈化时间为10 d时，材料具有最优的电化学性能，尤其是倍率性能。在2.0~4.8 V的电压范围内以0.1 C充放电循环60周后放电比容量仍为206.7 mAh·g^-1，2.0 C时的放电比容量为125.6 mAh·g^-1。

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	杨芳凝
	田建华
	朱希
	单忠强

关键词：锂离子电池富锂层状氧化物溶胶-凝胶法陈化时间

Abstract：

To meet the increasing demand for lithium-ion batteries, the electrochemical properties of Li-rich layered oxides (LLOs), Li_1.2Mn_0.54Ni_0.13Co_0.13O₂, one of the cathodes with high capacity, are still needed to be improved. Using citric acid as a chelating agent, the LLOs with different particle sizes were prepared by sol-gel method under different calcination temperature and aging times. The samples were characterized by X-ray diffraction and scanning electron microscopy. The results indicate that the particle size grows with the increase of calcination temperature, and firstly increases and then decreases when the aging time is prolonged. When the calcination temperature is 850℃ and ages for 10 days, the material presents the best electrochemical performance, especially rate performance. When the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ electrode is charged and discharged at 0.1 C between 2.0~4.8 V, the discharge capacity is still 206.7 mAh·g^-1 after 60 cycles and the discharge capability is 125.6 mAh·g^-1 at 2.0 C.

Keywords： lithium-ion batteries； Li-rich layered oxides； sol-gel method； aging time

Received 2016-04-01;

Fund:

国家高技术研究发展计划（2013AA050901）资助项目。

Corresponding Authors: 单忠强,E-mail:shanzq@tju.edu.cn。 Email: shanzq@tju.edu.cn

About author: 杨芳凝(1990-),女,硕士研究生,现从事锂离子电池正极材料的研究。

引用本文:

杨芳凝, 田建华, 朱希, 单忠强.溶胶-凝胶法制备条件对Li_1.2Mn_0.54Ni_0.13Co_0.13O₂电化学性能的影响[J]. 化学工业与工程, 2018,35(1): 1-7

Yang Fangning, Tian Jianhua, Zhu Xi, Shan Zhongqiang.Influence of the Synthesis Condition of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ on the Electrochemical Properties[J]. Chemcial Industry and Engineering, 2018,35(1): 1-7

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