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

Abstract

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

CLC Number:

TM912.9

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.

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

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