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Research Article

Controllable construction of La2Li0.5Co0.5O4 multifunctional “armor” to stabilize Li-rich layered oxide cathode for high-performance lithium-ion batteries

Xiaoyang Deng1,§, Mi Li1,§, Zizai Ma2,3, Xiaoguang Wang1,2( )
Institute of New Carbon Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, China
College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, China

§ Xiaoyang Deng and Mi Li contributed equally to this work.

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Graphical Abstract

Li1.2Mn0.54Ni0.13Co0.13O2 cathode is modified through La2Li0.5Co0.5O4 coating. The modified cathode demonstrates excellent cycling stability and rate performance.

Abstract

Lithium-rich manganese-based cathodes (LR) are valuable cathode materials for the next generation of lithium-ion batteries (LIBs) with high-energy density. However, the fast voltage/capacity decay on cycling is the major obstacle for the practical application induced by the less-than-ideal anionic redox reactions and structure distortion. Herein, in order to tackle these challenges, a perovskite-like La2Li0.5Co0.5O4 (LLCO) material is selected as protective surface to stabilize the Li1.2Mn0.54Ni0.13Co0.13O2 (LR) substrate through wet chemical coating method. Versatile structure/phase characterizations and electrochemical tests exhibit that the LLCO can not only minish the oxygen evolution and enhance the structure stability, but also restrain the electrolyte corrosion and increase the mechanical strength of cathode materials. Moreover, the coated LLCO with high electronic/ionic conductivity dramatically accelerates the energy storage kinetic, thereby displaying the improved rate performance. Specifically, the optimized LR@LLCO sample (1LLCO) exhibits a high capacity of 250.6 mAh·g−1 after 100 cycles at 0.1 C and excellent capacity retention of 82.6% after 200 cycles at 2 C. This work provides a new idea for the modification of LR cathodes toward commercial high-performance LIBs.

Keywords

lithium-rich manganese-based oxidelithium-ion batteriessurface modificationelectrochemical performance

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 10634-10643
DOI: 10.1007/s12274-023-5613-2
Cite this article:
Deng X, Li M, Ma Z, et al. Controllable construction of La2Li0.5Co0.5O4 multifunctional “armor” to stabilize Li-rich layered oxide cathode for high-performance lithium-ion batteries. Nano Research, 2023, 16(7): 10634-10643. https://doi.org/10.1007/s12274-023-5613-2
Topics:
CathodesIon batteries

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Received: 11 December 2022
Revised: 23 February 2023
Accepted: 23 February 2023
Published: 18 April 2023
© Tsinghua University Press 2023
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