锂离子电池正极材料铌掺杂LiNiO2 的制备与电化学性能

doi:10.19964/j.issn.1006-4990.2022-0270

摘要/Abstract

摘要：

为了提高LiNiO₂的电化学性能，用固相反应法制备了铌掺杂LiNiO₂材料，并用X射线衍射（XRD）分析、恒电流滴定技术（GITT）、电化学阻抗谱（EIS）等方法研究铌掺杂量对LiNiO₂的结构和性能的影响。结果表明适量的铌（Nb）掺杂可以提高LiNiO₂层状结构的有序程度，降低Li⁺/Ni²⁺混合程度，降低电荷转移阻抗，提高活性材料中锂离子的扩散系数。其中LiNi_0.99Nb_0.01O₂在0.5C循环100次的容量保持率为91.4%，5C时放电比容量为143 mA·h/g。而未掺杂铌的LiNiO₂在相同条件下的容量保持率和比容量仅为69.2%和127 mA·h/g。结果说明铌掺杂能够有效提高LiNiO₂的电化学性能。

关键词: 锂离子电池, 正极材料, LiNiO₂, 掺杂

Abstract:

In order to improve the performance of LiNiO₂，Nb-doped LiNiO₂was prepared by a solid-state reaction method.The effects of the amount of Nb-doping on the structure and performance of LiNiO₂ were investigated by X-ray diffraction analysis（XRD），galvanostatic titration（GITT），electrochemical impedance spectroscopy（EIS） and other methods.Nb-doping could effectively improve the order degree of the layered structure，reduce Li⁺/Ni²⁺ mixing，reduce the charge transfer impedance，and increase the diffusion coefficient of Li⁺ in the active materials.Therefore，LiNi_0.99Nb_0.01O₂ exhibited higher capacity retention（91.4% after 100 cycles at 0.5C） and better rate capability（143 mA·h/g at 5C）.As a comparison，the data of bare LiNiO₂ was 69.2% and 127 mA·h/g under the same conditions.These results further demonstrated that Nb-doping with a strong Nb—O bond，high valence stat，and larger ionic radius could effectively improve the performance of LiNiO₂.

Key words: lithium-ion batteries, cathode material, LiNiO₂, doping

中图分类号:

TM912.9

黄丽颖,陆冬楚,宁玉雪,胡婷婷,陈晴,黄国欣,苏静,文衍宣. 锂离子电池正极材料铌掺杂LiNiO₂的制备与电化学性能[J]. 无机盐工业, 2022, 54(11): 52-58.

HUANG Liying,LU Dongchu,NING Yuxue,HU Tingting,CHEN Qing,HUANG Guoxin,SU Jing,WEN Yanxuan. Preparation and electrochemical performance of Nb-doped LiNiO₂ cathode material for lithium-ion batteries[J]. Inorganic Chemicals Industry, 2022, 54(11): 52-58.

图/表 9

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样品	R_S/Ω	R_SEI/Ω	R_ct/Ω	S_qr
LNO-000	1.6	36.8	117.8	0.117 8
LNO-75	0.6	28.7	110.1	0.134 5
LNO-100	1.1	32.9	87.1	0.109 2
LNO-125	1.2	29.1	230.8	0.934 7

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锂离子电池正极材料铌掺杂LiNiO₂的制备与电化学性能

Preparation and electrochemical performance of Nb-doped LiNiO₂ cathode material for lithium-ion batteries

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