锂离子电池石墨负极材料的包覆改性及电化学性能研究

doi:10.19964/j.issn.1006-4990.2025-0021

Abstract

Abstract:

Graphite is an important anode material for lithium-ion batteries，but the low initial coulombic efficiency，short cycle life，and poor rate performance of natural graphite limit its application.In order to improve the stability of its graphite structure and electrochemical performance，Al（NO₃）₃·9H₂O was used as the aluminum source with adjusting the pH with ammonia water and uniformly coating a layer of Al（OH）₃ on the surface of graphite by precipitation method，and Al₂O₃ coated graphite anode material was further prepared by heat treatment.Compared with the atomic layer deposition method，this method had the advantages of simple process and low cost，better control of the reaction process and lower energy consumption than the sol gel method.When the Al₂O₃ coating mass was 1.03%，the modified graphite surface was smooth.The Al₂O₃ coating layer could serve as a preformed solid electrolyte interface（SEI），reducing the regeneration of SEI and the consumption of lithium ions during subsequent cycling processes.Electrochemical performance tests showed that the materials exhibited excellent rate performance and cycling stability during charge and discharge processes.Graphite and Al₂O₃ coated graphite anode materials with a modification amount of 1.03% were assembled with lithium sheets to form lithium-ion batteries.After 100 cycles of charge and discharge at a current density of 0.1C（1.0C=372 mA∙h/g），the specific capacities were 212.59 mA∙h/g and 354.37 mA∙h/g，with capacity retention rates of 67.99% and 98.59%，respectively.

Key words: lithium-ion batteries, alumina, surface modification, anode material

CLC Number:

TQ131.11

LING Zheng, SUN Lu, TIAN Peng, YE Junwei. Study on coating modification and electrochemical performance investigation of graphite anode materials for lithium-ion batteries[J]. Inorganic Chemicals Industry, 2025, 57(12): 18-25.

Figures/Tables 6

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Table 1

References 35

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负极材料	改性方法	首次库伦效率/%	循环后比容量/（mA·h·g^-1）	循环容量保持率/%
MCMB-1^［20］	双水解法	90.73	295.00 （0.2C，100次）	98.57（0.2C，100次）
G05U^［22］	溶胶- 凝胶法	90.70	290.00 （0.33C，50次）	91.33（0.33C，50次）
1% Al₂O₃ （质量分数）^［25］	溶胶- 凝胶法	94.60	334.00 （1.1C，100次）	94.83（1.1C，100次）
0.7%-Al-A （质量分数）^［26］	溶胶浸渍- 包覆法		385.06 （0.1C，45次）	93.45（0.1C，45次）
BG/Al₂O₃-1.8^［34］	高能球磨法	84.21	344.00 （2.7C，500次）	84.00（2.7C，500次）
AN-1^［35］	溶胶- 凝胶法	93.40		84.95（1C，200次）
C-Al₂O₃-2 （本工作）	沉淀法	91.64	354.37 （0.1C，100次）	98.59（0.1C，100次）

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Study on coating modification and electrochemical performance investigation of graphite anode materials for lithium-ion batteries

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