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Issue 36, 2019
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LiNi0.90Co0.07Mg0.03O2 cathode materials with Mg-concentration gradient for rechargeable lithium-ion batteries

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Abstract

Nickel-rich layered oxides are attractive cathode materials for Li-ion batteries because of high energy density and low cost, but suffer from unsatisfactory cycling performance and poor thermal stability. Here we report the synthesis and application of Mg-concentration-gradient LiNi0.90Co0.07Mg0.03O2 (CG-NCMg) microspheres as a high-performance cathode material. The CG-NCMg, synthesized via Mg-cascade feeding coprecipitation and solid-state lithiation, exhibits a high capacity of 167.4 mA h gāˆ’1 at 10C rate and a capacity retention of 80.9% after 300 cycles at 1C, significantly outperforming the Mg-concentration-constant cathode. The superior performance is attributed to the concentration-gradient microstructure, in which the Mg-poor core provides high capacity while the Mg-rich shell with dilated interlayer spacing enhances structure stability and Li-ion diffusivity. These results indicate that low-content, concentration-gradient Mg doping is an efficient strategy to boost Ni-rich layered cathode materials.

Graphical abstract: LiNi0.90Co0.07Mg0.03O2 cathode materials with Mg-concentration gradient for rechargeable lithium-ion batteries

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Supplementary files

Article information


Submitted
14 Mar 2019
Accepted
26 Aug 2019
First published
27 Aug 2019

J. Mater. Chem. A, 2019,7, 20958-20964
Article type
Paper

LiNi0.90Co0.07Mg0.03O2 cathode materials with Mg-concentration gradient for rechargeable lithium-ion batteries

Y. Zhang, H. Li, J. Liu, J. Zhang, F. Cheng and J. Chen, J. Mater. Chem. A, 2019, 7, 20958
DOI: 10.1039/C9TA02803J

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