Investigation on the effect of Na doping on structure and Li-ion kinetics of layered LiNi0.6Co0.2Mn0.2O2 cathode material

被引：148

作者：

Huang, Zhenjun ^{[1
]}

Wang, Zhixing ^{[1
]}

Jing, Qun ^{[2
]}

Guo, Huajun ^{[1
]}

Li, Xinhai ^{[1
]}

Yang, Zhihua ^{[3
,4
,5
]}

机构：

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

[2] Shihezi Univ, Coll Sci, Dept Phys, Shihezi 832000, Peoples R China

[3] Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, 40-1 South Beijing Rd, Urumqi 830011, Peoples R China

[4] Xinjiang Key Lab Elect Informat Mat & Devices, 40-1 South Beijing Rd, Urumqi 830011, Peoples R China

[5] Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, 40-1 South Beijing Rd, Urumqi 830011, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2016年 / 192卷

关键词：

Lithium-ion Batteries; Na-doping; Rate capabilty; Li-ion diffusion coefficient; First-principle calculation; CHEMICAL DIFFUSION-COEFFICIENTS; HIGH-RATE CAPABILITY; LITHIUM-ION; ELECTROCHEMICAL PROPERTIES; ANODE MATERIAL; ELECTRODE MATERIALS; HIGH-POWER; PERFORMANCE; CAPACITY; SYSTEM;

D O I：

10.1016/j.electacta.2016.01.139

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Introducing the Na ion into the Ni-rich LiNi0.6Co0.2Mn0.2O2, Li1-xNaxNi0.6Co0.2Mn0.2O2 (x = 0, 0.01, 0.03) has been synthesized by high-temperature solid method. The effect of Na dopants on the structure, morphology, electrochemical properties, Li ion diffusion coefficient and the activation barriers has been extensively studied. Rietveld refinement results reveal that Na doping suppress cation mixing degree effectively and enlarge Li slab space. Electrochemical testing shows that Na-doped electrodes exhibit higher initial coulombic efficiency, good capacity retention and superior rate capability. Using experiments combined with first-principles calculations, we confirmed that the Na doping has enlarged Li slab space and then made the activation barrier of Li migration be reduced resulting higher Li+ diffusion coefficients. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：120 / 126

页数：7

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