Nb2O5掺杂对LiNi0.9Mn0.1O2正极材料结构及电化学性能的影响

摘要采用高温固相反应法,将Nb₂O₅与Ni_0.9Mn_0.1(OH)₂前驱体、LiOH·H₂O一起混合焙烧,制备了Nb₂O₅掺杂改性的LiNi_0.9Mn_0.1O₂材料,研究了Nb₂O₅掺杂量对材料的晶体结构、形貌和电化学性能的影响和作用机制。实验结果表明,Nb⁵⁺掺杂可以提高LiNi_0.9Mn_0.1O₂层状结构的有序程度,拓宽过渡金属层间距,降低Li⁺/Ni²⁺混合程度,减少锂离子在电极材料中脱嵌和扩散阻力。在2.7~4.4 V、1.0 C 下,掺杂0.5% Nb₂O₅的NM-0.5Nb材料循环200 次后容量保持率为83.73%,明显高于LiNi_0.9Mn_0.1O₂的容量保持率(74.73%)。循环伏安和电化学阻抗谱数据说明Nb₂O₅掺杂可以减少电极极化,降低材料的电化学阻抗,提高Li⁺扩散速率,从而改善材料的循环性能和倍率性能。

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	何正
	刘婧
	雷海林
	李韡
	郭翠梨

关键词：锂离子电池 LiNi_0.9Mn_0.1O₂ Nb掺杂正极材料

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.

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

Received 2023-03-13;

Corresponding Authors: 郭翠梨,教授,gcl@tju.edu.cn。 Email: gcl@tju.edu.cn

About author: 何正(1996—),男,硕士研究生,主要研究方向为电池材料的研究。

引用本文:

何正, 刘婧, 雷海林, 李韡, 郭翠梨.Nb₂O₅掺杂对LiNi_0.9Mn_0.1O₂正极材料结构及电化学性能的影响[J]. 化学工业与工程, 2025,42(2): 11-19

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, 2025,42(2): 11-19

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