Improving the fast discharge performance of high-voltage LiNi0.5Mn1.5O4 spinel by Cu2+, Al3+, Ti4+ tri-doping

被引：61
作者：
Deng, Jicheng [1 ,2 ,3 ]
Xu, Youlong [1 ,2 ,3 ]
Xiong, Lilong [1 ,2 ]
Li, Liang [1 ,2 ]
Sun, Xiaofei [3 ]
Zhang, Yuan [1 ,2 ]
机构：
[1] Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab Minist Educ, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, Int Ctr Dielectr Res, Xian 710049, Peoples R China
[3] Xi An Jiao Tong Univ, Shaanxi Engn Res Ctr Adv Energy Mat & Devices, Xian 710049, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 677卷
基金：
中国国家自然科学基金;
关键词：
Lithium ion batteries; Cathode materials; LiMn1.5Ni0.5O4; Tridoping; LI-ION BATTERIES; ELECTROCHEMICAL PROPERTIES; CATHODE MATERIALS; ELECTRONIC-STRUCTURE; LITHIUM INSERTION; CATION; CR; FE; CO; SUBSTITUTION;
D O I：
10.1016/j.jallcom.2016.03.256
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：
The sluggish Li+ ion diffusion coefficient at similar to 4.7 V (vs. Li+/Li) greatly impairs the fast discharge performance of LiMn1.5Ni0.5O4 cathode material. Herein, a tri-doping strategy is proposed where Cu2+, Al3+, Ti4+ ions are partially substituted for Ni2+ and Mn4+. Cu2+, Al3+, Ti4+ tri-doping effectively suppresses the LixNi1-xO impurity phase, increases the cation mixing in the octahedral B-site in the spinel, enlarges the electronic conductivity, and enhances the structural stability. Most importantly, the Li+ diffusion coefficients show a peculiar boost at 4.7 V by two orders of magnitude after tri-doping. Compared to the pristine LiMn1.5Ni0.5O4 (denoted P-LNM), the tri-doped Li[Ni0.455Cu0.03Al0.03Mn1.455Ti0.03]O-4 (denoted TD-LNM) exhibits much better fast discharge performance, delivering a specific capacity of similar to 101 mAh g(-1) at 100 C discharge rate. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：18 / 26
页数：9
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