纳米氧化铝浆料制备及用于改性锂电池正极材料

doi:10.19964/j.issn.1006-4990.2023-0062

Abstract

Abstract:

In order to develop a more simple and efficient method of alumina modified cathode materials，and improve the rate and cycle performance of lithium battery cathode materials，the preparation of nano-alumina slurry with Ammonium polyacrylate（PAANH₄） as dispersant and the coating of nano-alumina on the cathode material LiNi_0.8Co_0.1Mn_0.1O₂ were studied.Through the experiment，it was optimized that the particle size of nano-alumina was smaller and uniform，when the addition amount of PAANH₄ was 4% ，and the milling time was 8 h.This nano-alumina slurry was used to modify the cathode material of lithium ion battery.It was found that the addition of alumina did not change the surface morphology，particle size and crystal structure of the cathode material.In the electrochemical performance test，when the alumina coating amount was 0.3%（mass fraction），better enhanced rate performance was obtained，and when the alumina coating amount was 0.5%（mass fraction），better cycling stability was obtained.At 1C rate，the capacity retention rates of uncoated and 0.5%（mass fraction）alumina-coated cathode materials were 75.61% and 84.93% after 100 times，respectively.

Key words: nano-alumina slurry, surface modification, cathode material, lithium-ion battery

CLC Number:

TQ133.1

TIAN Peng, XU Jingang, XU Qianjin, LIU Kunji, PANG Hongchang, NING Guiling. Preparation of nano-alumina slurry and its application in modifying lithium-ion battery cathode material[J]. Inorganic Chemicals Industry, 2023, 55(12): 43-49.

Figures/Tables 5

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Table 1

References 42

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正极材料	改性方法	循环容量保持率/%
NCM811^［37］	ALD	73.87（0.1C，100次）
NCM811 ^［34］	溅射法	88.30（1C，100次）
NCM622 ^［38］	浸渍法	82.00（0.5C，100次）
NCM523^［39］	ALD	76.80（1C，30次）
NCM622^［40］	干法	85.00（1C，100次）
NCM^［41］	ALD	84.70（1C/3，80次）
NCM811^［42］	浸渍法	82.67（0.5C，100次）
NCM811（本工作）	—	84.93（1C，100次）

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Preparation of nano-alumina slurry and its application in modifying lithium-ion battery cathode material

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