Effect of Nb doping on structure and electrochemical properties of LiNi0.9Mn0.1O2 cathode material

Abstract In this paper, the high temperature solid-phase reaction method is used, and Nb₂O₅ is mixed with LiNi_0.9Mn_0.1O₂ precursor and LiOH·H₂O in one step to prepare Nb₂O₅-doping LiNi_0.9Mn_0.1O₂. The effect and mechanism of Nb₂O₅ doping amount on the crystal structure, morphology and electrochemical property were investigated. The experimental results show that Nb⁵⁺ doping can improve the order of layered structure, expand the spacing between transition metal layers, reduce cation mixing of Li⁺/Ni²⁺ and facilitate the de-intercalation of Li⁺ in the active material. At the voltage of 2.7—4.4 V and 1.0 C, NM-0.5Nb exhibited the capacity retention of 83.73% after 200 cycles, significantly higher than the retention rate (74.73%) of LiNi_0.9Mn_0.1O₂. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) test results show that the electrochemical polarization and impedance of NM-0.5Nb cathode material decreases and the lithium ion diffusion rate increases, so the cycle performance and the rate performance of Nb₂O₅-doping LiNi_0.9Mn_0.1O₂ cathode material are improved.

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	HE Zheng
	LIU Jing
	LEI Hailin
	LI Wei
	GUO Cuili

Keywords： lithium ion battery LiNi_0.9Mn_0.1O₂ Nb doping cathode material

Received 2023-03-13;

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HE Zheng, LIU Jing, LEI Hailin, LI Wei, GUO Cuili.Effect of Nb doping on structure and electrochemical properties of LiNi_0.9Mn_0.1O₂ cathode material[J] Chemcial Industry and Engineering, 2025,V42(2): 11-19

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