正极材料LiNi0.8Co0.1Mn0.1O2的合成工艺优化及电化学性能

doi:10.11949/j.issn.0438-1157.20161631

化工学报 ›› 2017, Vol. 68 ›› Issue (4): 1652-1659.DOI: 10.11949/j.issn.0438-1157.20161631

• 材料化学工程与纳米技术 • 上一篇下一篇

正极材料LiNi_0.8Co_0.1Mn_0.1O₂的合成工艺优化及电化学性能

肖忠良, 胡超明, 宋刘斌, 卢意鹏, 刘姣, 曾鹏

长沙理工大学化学与生物工程学院, 电力与交通材料保护湖南省重点实验室, 湖南长沙 410114

收稿日期:2016-12-29 修回日期:2016-12-29 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: 宋刘斌
基金资助:
国家自然科学基金项目（21501015，21545010，31527803）；中国科学院环境监测STS项目(KFJ-SW-STS-173)；湖南省自然科学基金项目（2016JJ3007）；湖南省科技计划项目（2015GK1046）。

Optimization for synthesis technology of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material and electrochemical performance

XIAO Zhongliang, HU Chaoming, SONG Liubin, LU Yipeng, LIU Jiao, ZENG Peng

Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China

Received:2016-12-29 Revised:2016-12-29 Online:2017-04-05 Published:2017-04-05
Supported by:
supported by the National Natural Science Foundation of China (21501015, 21545010, 31527803), the STS Project of the Chinese Academy of Sciences (KFJ-SW-STS-173), the Natural Science Foundation of Hunan Province (2016JJ3007) and the Scientific Program of Hunan Province (2015GK1046).

摘要/Abstract

摘要：

采用高温固相法合成锂离子电池富镍三元材料LiNi_0.8Co_0.1Mn_0.1O₂，对其工艺条件进行优化，对产物进行X射线衍射（XRD（，扫描电镜（SEM（以及电化学性能分析。结果表明：在氧气气氛下，锂与金属元素摩尔比为1.05:1、烧结时间15 h、烧结温度750℃为最佳合成工艺条件。按最佳工艺合成的样品在1C首次放电容量高达174.9 mA·h·g^-1，50次循环后比容量为158.5 mA·h·g^-1，容量保持率为90.62%，表现出良好的循环稳定性。XRD和SEM表征表明，在氧气气氛下烧结的样品有良好的层状结构，阳离子混排程度小，具有较好的类球形，粒径均匀分布在10~20 μm。循环伏安（CV（和电化学阻抗（EIS（结果表明，工艺条件的优化有助于提高正极材料的电化学性能。

关键词: LiNi_0.8Co_0.1Mn_0.1O₂, 合成, 高温固相, 电化学, 稳定性, 锂离子电池

Abstract:

Ni-rich ternary cathode material LiNi_0.8Co_0.1Mn_0.1O₂ for lithium-ion battery was synthesized by a high-temperature solid-state reaction method, and its process conditions were optimized. The structural and morphological features of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material prepared were investigated with X-ray diffraction and scanning electron microscopy. Its electrochemical properties were analyzed. The results showed that under the oxygen atmosphere, the molar ratio of lithium to metal elements was 1.05:1, the sintering time was 15 h and the sintering temperature was 750℃, the optimal synthesis conditions were obtained. The initial discharge capacity of the sample was 174.9 mA·h·g^-1 at 1C, the specific capacity was 158.5 mA·h·g^-1 after 50 cycles, and the capacity retention rate was 90.62%, which showed good cycle stability. The results of XRD and SEM showed that the sample sintered in oxygen atmosphere had a good layered structure with a small degree of cationic mixing and a good spherical shape. The particles were uniformly distributed in the range of 10-20 μm. The results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed that the electrochemical performance of the cathode materials was improved by optimization conditions.

Key words: LiNi_0.8Co_0.1Mn_0.1O₂, synthesis, high-temperature solid-state, electrochemistry, stability, lithium-ion battery

中图分类号:

TM912.9

肖忠良, 胡超明, 宋刘斌, 卢意鹏, 刘姣, 曾鹏. 正极材料LiNi_0.8Co_0.1Mn_0.1O₂的合成工艺优化及电化学性能[J]. 化工学报, 2017, 68(4): 1652-1659.

XIAO Zhongliang, HU Chaoming, SONG Liubin, LU Yipeng, LIU Jiao, ZENG Peng. Optimization for synthesis technology of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material and electrochemical performance[J]. CIESC Journal, 2017, 68(4): 1652-1659.

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正极材料LiNi_0.8Co_0.1Mn_0.1O₂的合成工艺优化及电化学性能

Optimization for synthesis technology of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material and electrochemical performance

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