Preparation and Electrochemical Properties of K+ Doped LiNi1/3Co1/3Mn1/3O2 Materials

Abstract

Abstract: LiNi_1/3Co_1/3Mn_1/3O₂, a cathode material for Li-ion battery, has the advantages of large discharge specific capacity, good thermal stability, low cost, and good safety performance, but its rate performance needs to be further improved. Therefore, K⁺ doped LiNi_1/3Co_1/3Mn_1/3O₂ materials (LNCM-xK) were prepared by hydrothermal method in this paper.The morphology and structure of LNCM-xK were characterized by X-ray diffraction spectrum, field emission scanning electron microscopy and X-ray photoelectron spectroscopy, and its electrochemical properties were tested by electrochemical workstation and blue electric test system. The results show that K⁺ doping can effectively reduce the cation mixing degreeand effectively improve the electrochemical properties of LiNi_1/3Co_1/3Mn_1/3O₂ materials, among which K⁺ doped LiNi_1/3Co_1/3Mn_1/3O₂ (LNCM-0.125K) of x=0.125 has the lowest cation mixing degree. The LNCM-0.125K sample has the best electrochemical performance. The capacity retention rate is 96.15% after 50 cycles at 0.2 C. The rate performance is carried out at different current density (0.2 C, 0.5 C, 1 C, 2 C, 5 C), and the capacity retention rate is 97.00% after 30 cycles of continuous charge and discharge.

Key words: rate performance, K⁺ doping, LiNi_1/3Co_1/3Mn_1/3O₂, cycle performance, Li-ion battery, cathode material

CLC Number:

TM912

GUO Lifang, XIE Yulong, BEN Cuoji. Preparation and Electrochemical Properties of K⁺ Doped LiNi_1/3Co_1/3Mn_1/3O₂ Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3272-3278.

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Preparation and Electrochemical Properties of K⁺ Doped LiNi_1/3Co_1/3Mn_1/3O₂ Materials

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