Al-doping enables high stability of single-crystalline LiNi0.7Co0.1Mn0.2O2 lithium-ion cathodes at high voltage

被引：42

作者：

Cheng, Lei ^{[1
]}

Zhang, Bao ^{[1
]}

Su, Shi-Lin ^{[1
]}

Ming, Lei ^{[1
]}

Zhao, Yi ^{[1
]}

Tan, Xin-Xin ^{[1
]}

机构：

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

来源：

RSC ADVANCES | 2021年 / 11卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Ions - Manganese compounds - Nickel compounds - Lithium compounds - Lithium-ion batteries - Stability;

D O I：

10.1039/d0ra09813b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

LiNi0.7Co0.1Mn0.2O2 (NCM) is a kind of promising cathode material for lithium ion batteries because of its high capacities. However, the further commercialization of this material has been seriously hindered by the unstable structure at a deep de-lithiation state. Herein, it is identified that this drawback can be diminished by Al-doping, which is inherently stable in the lattice framework to restrain the structural collapse of LiNi0.7Co0.1Mn0.2O2 at a high cut-off voltage (4.4 V). As expected, the Al-doped NCM (NCM-0.2Al) material obtains the highest reversible capacity and capacity retention (144.69 mA h g(-1), 80.26%) after 90 cycles at 1C. The excellent performance demonstrates that Al-doping can effectively enhance the Li+-ion diffusion kinetic and structural stability of NCM, providing a feasible strategy for the further industrialization of Ni-rich materials.

引用

页码：124 / 128

页数：5