Citation: Zuhao Zhang, Xiaoyan Xie, Huixian Xie, Xiaokai Ding, Jiaxiang Cui, Chenyu Liu, Dong Luo, Zhan Lin. Dual-site Doping to Enhance Oxygen Redox and Structural Stability of Li-rich Layered Oxides[J]. Chinese Journal of Structural Chemistry, ;2022, 41(4): 220406. doi: 10.14102/j.cnki.0254-5861.2022-0066 shu

Dual-site Doping to Enhance Oxygen Redox and Structural Stability of Li-rich Layered Oxides

Zuhao Zhang ¹ ,
Xiaoyan Xie ¹ ,
Huixian Xie ¹ ,
Xiaokai Ding ¹ ,
Jiaxiang Cui ¹ ,
Chenyu Liu ^1,, ,
Dong Luo ^1,, ,
Zhan Lin ¹

1.
Guangzhou Key Laboratory of Clean Transportation Energy Chemistry, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China

Corresponding author: Chenyu Liu, cy.liu@gdut.edu.cn Dong Luo, luodong@gdut.edu.cn
Received Date: 21 March 2022
Accepted Date: 4 April 2022

Figures(5)

Cobalt-free Li-rich layered oxides (LLOs) such as Li_1.2Mn_0.6Ni_0.2O₂ have attracted extensive attention owing to their high specific capacity and low cost. Nonetheless, numerous problems such as continuous voltage fading and capacity decay have become stumbling blocks in its commercial application. In this study, we propose an effective dual-site doping strategy by choosing Mo as the cation and F as the anion to enhance the capacity and cycling performance. The research demonstrates that the cycling stability of LLOs enhances with the doping ratio of Mo, and their capacity increases with the doping ratio of F. It is because Mo as a pillar enhances the structural stability and F doping is conducive to the activation of Li₂MnO₃. What's more, dual-site doping also promotes the diffusion of Li⁺ and reduces the internal resistance of the electrode. Due to these improvements, the 5F3M sample still maintains a discharge capacity of 190.98 mAh g^-1 after 100 cycles at 200 mA g^-1, which is much higher than 165.29 mAh g^-1 of the Pristine sample. This discovery provides a new way to develop advanced layered oxide cathodes for both Na- and Li-ion batteries.
- lithium-ion battery,
- Li-rich layered oxides,
- doping,
- Li₂MnO₃
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