Improving the Electrochemical Performance of Core–Shell LiNi 0.8 Co 0.1 Mn 0.1 O 2 Cathode Materials Using Environmentally Friendly Phase Structure Control Process

Lipeng Xu (), Chongwang Tian, Chunjiang Bao (), Jinsheng Zhao and Xuning Leng
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Lipeng Xu: School of Mechanical and Automotive Engineering, Liaocheng University, Liaocheng 252000, China
Chongwang Tian: School of Mechanical and Automotive Engineering, Liaocheng University, Liaocheng 252000, China
Chunjiang Bao: School of Mechanical and Automotive Engineering, Liaocheng University, Liaocheng 252000, China
Jinsheng Zhao: School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China
Xuning Leng: Shandong Yellow Sea Science and Technology Innovation Research Institute, Rizhao 262306, China

Energies, 2023, vol. 16, issue 10, 1-17

Abstract: The phase structure of the precursor is crucial for the microstructure evolution and stability of Ni-rich cathode materials. Using sodium lactate as a green complexing agent, cathode electrode materials with different phase structures and unique core–shell structures were prepared by the co-precipitation method in this study. The influence of the phase structure of the nickel-rich precursor on the cathode electrode materials was studied in depth. It was found that α-NCM811 had large interlayer spacing, which was beneficial for the diffusion of lithium ions. In contrast, β-NCM811 had smaller interlayer spacing, a good layered structure, and lower ion mixing, resulting in better cycling performance. The core–shell-αβ-NCM811 with α-NCM811 as the core and β-NCM811 as the shell was prepared by combining the advantages of the two different phases. The core–shell-αβ-NCM811 showed the highest discharge capacity of 158.7 mAh/g at 5 C and delivered excellent rate performance. In addition, the β-NCM811 shell structure with smaller layer spacing could prevent corrosion of the α-NCM811 core by the electrolyte. Thus, the capacity retention rate of the core–shell-αβ-NCM811 was still as high as 86.16% after 100 cycles.

Keywords: precursor phase structure; core–shell cathode materials; LiNi 0.8 Co 0.1 Mn 0.1 O 2; electrochemical performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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