锂离子电池正极材料用CA6匣钵的改性研究

doi:10.3969/j.issn.1001-1935.2025.04.007

耐火材料 ›› 2025, Vol. 59 ›› Issue (4): 311-316.DOI: 10.3969/j.issn.1001-1935.2025.04.007

锂离子电池正极材料用CA₆匣钵的改性研究

姚丽君, 王官煜, 尹致远, 王志鹏, 温天朋

东北大学冶金学院辽宁沈阳 110819

收稿日期:2024-10-24 发布日期:2025-08-18
通讯作者: 温天朋,男,1992年生,博士,副教授。E-mail:wentianpeng@smm.neu.edu.cn
作者简介:姚丽君:女,2004年生,学士。E-mail:3172234319@qq.com

Modification of CA₆ saggers for lithium-ion battery cathode materials

Yao Lijun, Wang Guanyu, Yin Zhiyuan, Wang Zhipeng, Wen Tianpeng

First author's address:School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China

Received:2024-10-24 Published:2025-08-18

摘要/Abstract

摘要： 锂离子电池正极材料用匣钵材料易被含锂正极材料腐蚀,进而导致匣钵材料损毁,降低其使用寿命。为改善锂离子电池正极材料用匣钵材料的服役性能,提出以La₂O₃掺杂改性后的CA₆为锂离子电池正极材料烧成用匣钵材料,研究La₂O₃掺杂(外加质量分数分别为0、1.0%、2.0%、3.0%、和4.0%)对CA₆材料体积密度、显气孔率等性能以及物相组成、显微结构演变特征的影响,并考察LiMn₂O₄正极材料在CA₆匣钵表面的侵蚀行为和机制。结果表明:La³⁺以间隙型缺陷的形式进入晶格,同时形成氧空位缺陷,使晶体结构由板条状向六方柱状等轴态发展,致密化程度和力学性能提高。当La₂O₃掺杂量为4.0%(w)时,体积密度升高至3.14 g·cm^-3,显气孔率降低至12.0%。由于La₂O₃改性后的CA₆致密度的提升,其作为匣钵材料时可减少Li⁺向材料内部渗透,使材料具备良好的抗侵蚀性能。

关键词: 匣钵材料, CA₆, 掺杂改性, 锂离子电池正极材料, 抗侵蚀性

Abstract: The saggers used for lithium-ion battery cathode materials are easily corroded by lithium-containing cathode materials,which leads to damage of the saggers and reduction of their service life.To improve the service performance,La₂O₃-doped modified CA₆ was proposed as the sagger material.The effects of La₂O₃ extra-additions (0,1.0%,2.0%,3.0%,and 4.0%,by mass,respectively) on properties of CA₆ materials such as bulk density and apparent porosity,as well as phase composition and microstructure evolution characteristics were studied.In addition,the corrosion behavior and mechanism of LiMn₂O₄ cathode material on the surface of CA₆ saggers were investigated.The results show that La³⁺ enters the lattice in the form of interstitial defects and forms oxygen vacancy defects simultaneously,which makes the crystal structure develop from lath-like to hexagonal columnar equiaxed state,and improves the densification degree and mechanical properties.When the extra-addition of La₂O₃ is 4.0%,the bulk density increases to 3.14 g·cm^-3 and the apparent porosity decreases to 12.0%.Due to the improved density of La₂O₃-modified CA₆,CA₆ sagger material can reduce the penetration of Li⁺,thus exhibiting good corrosion resistance.

Key words: sagger materials, CA₆, doping modification, lithium-ion battery cathode materials, corrosion resistance

中图分类号:

TQ175

姚丽君, 王官煜, 尹致远, 王志鹏, 温天朋. 锂离子电池正极材料用CA₆匣钵的改性研究[J]. 耐火材料, 2025, 59(4): 311-316.

Yao Lijun, Wang Guanyu, Yin Zhiyuan, Wang Zhipeng, Wen Tianpeng. Modification of CA₆ saggers for lithium-ion battery cathode materials[J]. Refractories, 2025, 59(4): 311-316.

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锂离子电池正极材料用CA₆匣钵的改性研究

Modification of CA₆ saggers for lithium-ion battery cathode materials

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