ZrO2包覆富锂正极材料Li[Li0.2Ni0.2Mn0.6]O2

摘要

采用共沉淀-高温固相法制备了富锂正极材料Li[Li_0.2Ni_0.2Mn_0.6]O₂,并使用Zr(OC₃H₇)₄进行了ZrO₂包覆改性。通过X射线粉末衍射(XRD)、透射电子显微镜(TEM)和电化学测试手段讨论了ZrO₂包覆对材料的结构、形貌和电化学性能的影响。ZrO₂能均匀覆盖在Li[Li_0.2Ni_0.2Mn_0.6]O₂颗粒表面,包覆后材料的电化学性能有一定的改善。包覆质量分数0.5%的ZrO₂样品表现了提高的循环和倍率性能。首次放电容量(0.1 C,2.0~4.8 V)高达250.8 mAh·g^-1,循环45周(0.2 C)容量保持为201.6 mAh·g^-1,2.0 C倍率放电容量可达123.2 mAh·g^-1。

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	苏银利
	王丹
	陈丽
	单忠强

关键词：锂离子电池；富锂正极材料；层状结构； ZrO₂包覆；电化学性能

Abstract：

The Li-rich layered Li[Li_0.2Ni_0.2Mn_0.6]O₂ was prepared by co-precipitation and solid state reaction method, then coated with ZrO₂ (Zr(OC₃H₇)₄ as coating source). The X-ray diffraction (XRD), transmission electron microscope (TEM) techniques, and galvanostatic charge-discharge tests were used to investigate the effect of ZrO₂ coating on the crystal structures, morphology and electrochemical performance of Li-rich material Li[Li_0.2Ni_0.2Mn_0.6]O₂. The results showed that ZrO₂ particles was homogeneously covered on the surface of Li[Li_0.2Ni_0.2Mn_0.6]O₂, and the electrochemical performance was improved after ZrO₂ coating, the 0.5% ZrO₂ coated sample exhibited superior cycle performance and rate capability among the samples,The 0.5% ZrO₂-coated Li[Li_0.2Ni_0.2Mn_0.6]O₂ sample delivered initial discharge capacity of 250.8 mAh·g^-1 at 20 mA·g^-1 (0.1 C) in the range of 2.0 to 4.8 V, the discharge capacity maintained 201.6 mAh·g^-1after 45 cycles at 0.2 C,and the discharge capacity at 2.0 C rate attained 123.2 mAh·g^-1.

Keywords： lithium ion battery； Li-rich cathode； layered structure； ZrO₂ coating

Received 2013-05-03;

Corresponding Authors: 陈丽,E-mail:chenli_su@eyou.com。 Email: chenli_su@eyou.com

About author: 苏银利(1969-),男,工程师,现从事锂离子电池正极材料的研究。

引用本文:

苏银利, 王丹, 陈丽, 单忠强.ZrO₂包覆富锂正极材料Li[Li_0.2Ni_0.2Mn_0.6]O₂[J]. 化学工业与工程, 2015,32(4): 30-33

Su Yinli, Wang Dan, Chen Li, Shan Zhongqiang.Modification of ZrO₂-Coated Li[Li_0.2Ni_0.2Mn_0.6]O₂[J]. Chemcial Industry and Engineering, 2015,32(4): 30-33

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