Abstract:

When preparing ternary cathode material LiNi_xCo_yMn_zO₂(LNCM),the calcining saggers are vulnerable to the penetration and corrosion of Li₂O in the cathode material. Magnesium aluminate spinel has good hot performance and alkali resistance.The reaction between magnesium aluminate spinel and the precursor of LNCM cathode material at 800-1 100 ℃ was studied by the lab mixing reaction method.The phase composition and the microstructure of the mixed samples calcined at different temperatures were analyzed.The possibility of using magnesium aluminate spinel as the sagger matrix was explored.The effects of magnesium aluminate spinel powder addition (3%,6% and 9%,by mass) on the strength and the thermal shock resistance of the sagger materials were studied.The results show that the sagger containing magnesium aluminate spinel powder is suitable for the preparation of LNCM cathode material with a calcination temperature lower than 1 000 ℃;the addition of 6% can improve the thermal shock resistance of the mullite sagger material.

Key words: sagger, LiNi_xCo_yMn_zO₂ material, magnesium aluminate spinel, thermal shock resistance

摘要：

匣钵在煅烧制备三元正极材料LiNi_xCo_yMn_zO₂(LNCM)过程中易遭受电池正极材料中Li₂O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1 100 ℃的反应,对不同温度煅烧后混合试样的物相组成和微观结构进行了分析。探究了镁铝尖晶石作为匣钵基质的可能性。研究了加入不同质量分数(3%、6%和9%)镁铝尖晶石细粉对匣钵材料强度及抗热震性能的影响。结果表明:含镁铝尖晶石细粉的匣钵适用煅烧温度低于1 000 ℃的LNCM正极材料的制备,加入量为6%(w)时,能够提高莫来石质匣钵材料的抗热震性能。

关键词: 匣钵, LiNi_xCo_yMn_zO₂材料, 镁铝尖晶石, 抗热震性