CoAl2O4包覆LiNi1/3Co1/3Mn1/3O2的电化学性能

doi:10.13208/j.electrochem.141043

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (2): 145-151. doi: 10.13208/j.electrochem.141043

• 化学电源及其材料近期研究专辑（客座编辑：复旦大学夏永姚教授） • 上一篇下一篇

CoAl₂O₄包覆LiNi_1/3Co_1/3Mn_1/3O₂的电化学性能

蔡济钧¹，崔王君^1*，李冰²，余洋洋¹，赵金保^1,2*

1. 厦门大学化学化工学院，福建厦门 361005；2. 厦门大学能源学院，福建厦门 361102

收稿日期:2014-10-26 修回日期:2014-12-22 出版日期:2015-04-28 发布日期:2014-12-31
通讯作者: 崔王君, 赵金保 E-mail:wjcui@xmu.edu.cn, jbzhao@xmu.edu.cn
基金资助:
福建省自然科学基金项目（NO. 2012J05028）资助

Electrochemical Performance of CoAl₂O₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂

CAI Ji-jun1, CUI Wang-jun^1*, LI Bing2, YU Yang-yang¹, ZHAO Jin-bao^1,2*

1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. College of Energy, Xiamen University, Xiamen 361005, Fujian, China

Received:2014-10-26 Revised:2014-12-22 Published:2015-04-28 Online:2014-12-31
Contact: CUI Wang-jun, ZHAO Jin-bao E-mail:wjcui@xmu.edu.cn, jbzhao@xmu.edu.cn

摘要/Abstract

摘要： 通过共沉淀法制得类球形锂离子电池正极材料LiNi_1/3Co_1/3Mn_1/3O₂，并用非水相共沉法对其进行CoAl₂O₄包覆得到LNCMO(x). 采用X射线衍射（XRD）、扫描电子显微术（SEM）和透射电子显微术（TEM）测试材料的结构和观察材料形貌. 结果表明，CoAl₂O₄在材料表面形成8 nm均匀包覆层，未改变主体材料的结构. 电化学性能测试表明，1%（by mass）CoAl₂O₄包覆量的LiNi1/3Co1/3Mn1/3O2材料（LNCMO(1)）高充电电压（3.0 ~ 4.6 V，150 mA·g^-1）100周期循环放电容量保持率为93.7%（无包覆LNCMO(0)保持率为74.4%）；55 °C高温100周期循环容量保持率为77%（无包覆LNCMO(0)保持率17%）. XRD和电感耦合等离子体原子发射光谱（ICP-AES）测试表明，CoAl₂O₄包覆的LNCMO(x)材料可有效地减缓材料中Mn离子在电解液的溶解，提高材料结构稳定性和热稳定性.

关键词: 锂离子电池, LiNi_1/3Co_1/3Mn_1/3O₂, 电化学性能, CoAl₂O₄包覆

Abstract: A method to improve the electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂for high voltage lithium-ion battery by CoAl₂O₄ coating was present in this work. The effects of CoAl₂O₄ coatings on the structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were investigated in detail. The results show that CoAl₂O₄ forms a thin layer of 8 nm on the surface of LiNi_1/3Co_1/3Mn_1/3O₂ without destroying the structure of the core material. The CoAl₂O₄-coated LiNi_1/3Co_1/3Mn_1/3O₂ possesses better rate capability and cycle performance than the uncoated sample. The excellent cycling performance can be obtained even with 1% (by mass) CoAl₂O₄ coating, for example, the capacity retentions at the 100th cycle increase from 74.4% to 93.7% at room temperature, and 17.7% to 77% at 55 °C, respectively. It was also confirmed that the CoAl₂O₄ coating could depress Mn ions dissolving into the electrolyte, and could lead to the enhancement in the structural stability and the thermal stability of LiNi_1/3Co_1/3Mn_1/3O₂, suggesting that the CoAl₂O₄ coating is an efficient way to improve the electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂.

Key words: lithium-ion battery, LiNi_1/3Co_1/3Mn_1/3O₂, electrochemical performance, CoAl₂O₄ coating

中图分类号:

O646

蔡济钧，崔王君*，李冰，余洋洋，赵金保*. CoAl₂O₄包覆LiNi_1/3Co_1/3Mn_1/3O₂的电化学性能[J]. 电化学（中英文）, 2015, 21(2): 145-151.

CAI Ji-jun, CUI Wang-jun*, LI Bing, YU Yang-yang, ZHAO Jin-bao*. Electrochemical Performance of CoAl₂O₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂[J]. Journal of Electrochemistry, 2015, 21(2): 145-151.

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https://electrochem.xmu.edu.cn/CN/Y2015/V21/I2/145

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CoAl₂O₄包覆LiNi_1/3Co_1/3Mn_1/3O₂的电化学性能

Electrochemical Performance of CoAl₂O₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂

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