Improving rate capability and decelerating voltage decay of Li-rich layered oxide cathodes by chromium doping

被引：67
|
作者：
Li, Huimian [1 ]
Guo, Huajun [1 ]
Wang, Zhixing [1 ]
Wang, Jiexi [1 ]
Li, Xinhai [1 ]
Chen, Ning [2 ]
Gui, Weihua [2 ]
机构：
[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Sch Informat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2018年 / 43卷 / 24期
基金：
中国国家自然科学基金;
关键词：
Lithium rich layered oxide; Cr doping; Rate capability; Voltage decay; Stabilize oxygen; LITHIUM-ION BATTERIES; ENHANCED ELECTROCHEMICAL PERFORMANCE; ELECTRODE MATERIAL; DESIGN; CARBON; LI1.2MN0.54NI0.13CO0.13O2; NANOPARTICLES; SUBSTITUTION; CAPACITY; ANODE;
D O I：
10.1016/j.ijhydene.2018.04.203
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：
In order to improve the rate capability and mitigate the voltage decay of lithium rich layered oxides, chromium doped cathode materials Li-1.2[Mn0.54Ni0.13Co0.13](1-x)CrxO2 (x = 0,0.003,0.005,0.007) is synthesized via co-precipitation method followed by calcination. As a result, Cr-doped samples present shortened voltage platform at 4.5 V, indicating that the escape of lattice oxygen is suppressed by Cr doping. Among all samples, Li-1.2[Mn0.54Ni0.13Co0.13](1-x)CrxO2 (x = 0.005) sample shows the greatest rate capability (119.3 mAh g(-1) at 10 C) and the minimum voltage drop (0.6167 V) after 200 cycles at 1.0 C. The reasons for the improved electrochemical performance are the enhanced structural stability, the stronger Cr-O bond than Mn-O band and the decreased metal oxygen covalency induced by Cr doping. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：11109 / 11119
页数：11
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