Enhanced electrochemical performance and storage property of LiNi0.815Co0.15Al0.035O2 via Al gradient doping

被引：127

作者：

Duan, Jianguo ^{[1
]}

Hu, Guorong ^{[1
]}

Cao, Yanbing ^{[1
]}

Tan, Chaopu ^{[2
]}

Wu, Ceng ^{[2
]}

Du, Ke ^{[1
]}

Peng, Zhongdong ^{[1
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China

[2] Guangzhou Libode New Mat Co Ltd, Guangzhou 510800, Guangdong, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2016年 / 326卷

基金：

中国博士后科学基金;

关键词：

Lithium ion batteries; Cathode materials; Concentration-gradient; High cycling performance; LITHIUM-ION BATTERIES; LIXNI0.8CO0.15AL0.05O2 CATHODE MATERIALS; HIGH-ENERGY; LINI0.8CO0.15AL0.05O2; SURFACE; ALUMINUM; DIFFRACTION; LINIO2; LICOO2; OXIDE;

D O I：

10.1016/j.jpowsour.2016.07.008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LiNi1-x-yCoxAlyO2 is a commonly used Ni-rich cathode material because of its relatively low cost, excellent rate capability and high gravimetric energy density. Surface modification is an efficient way to overcome the shortcomings of Ni-rich cathodes such as poor cycling stability and poor thermal stability. A high-powered concentration-gradient cathode material with an average composition of LiNi0.815Co0.15Al0.035O2 (LGNCAO) has been successfully synthesized by using spherical concentration-gradient Ni0.815Co0.15Al0.035(OH)(2) (GNCA)as the starting material. An efficient design of the Al3+ precipitation method is developed, which enables obtaining spherical GNCA with similar to 10 mu m particle size and high tap density. In LGNCAO, the nickel and cobalt concentration decreases gradually whereas the aluminum concentration increases from the centre to the outer layer of each particle. Electrochemical performance and storage properties of LGNCAO have been investigated comparatively. The LGNCAO displays better electrochemical performance and improved storage stability than LNCAO. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：322 / 330

页数：9

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