摘要
为进一步提高锂电池正极材料煅烧用匣钵的性能,以煤矸石和氢氧化镁为原料合成尖晶石-镁橄榄石复相骨料(S-F)用于制备匣钵复合层,并对试样的抗热震性能和抗侵蚀性能进行了测试。研究结果表明:采用S-F等量替代镁橄榄石、尖晶石骨料制备匣钵复合层时,复相骨料与基质结合紧密,促使复合层试样内裂纹穿骨料断裂比例及偏转频率增加,故而消耗了更多断裂能,复合层抗折强度由替代前的16.4 MPa提高到20.2 MPa,3次热冲击后的残余强度保持率由33.5%提高到37.1%;复相骨料内尖晶石晶粒被镁橄榄石相包裹,避免了尖晶石与正极材料直接接触反应导致的过大体积膨胀,侵蚀层平均厚度也由518μm降至320μm,钵体复合层的抗正极材料侵蚀性能得到大幅提升。
To further enhance the performance of saggars used for calcining lithium-ion battery cathode materials,a spinel-forsterite multiphase aggregate(S-F)was synthesized from coal gangue and Mg(OH)2 as raw materials for preparing the saggar composite layer.The thermal-shock and corrosion resistances of the specimens were evaluated.The results show that replacing forsterite and spinel aggregates with the S-F aggregate in equal amounts can improve the bonding between the aggregate and the matrix.This promotes a higher proportion of cracks propagating through the aggregate and an increased frequency of crack deflection within the composite layer specimen,thereby consuming more fracture energy.Consequently,the rupture modulus of the composite layer rises from 16.4 MPa to 20.2 MPa,and the residual-strength ratio after three thermal-shock cycles increases from 33.5%to 37.1%.Within the multiphase aggregate,the spinel grains are enveloped by the forsterite phase,preventing direct contact and reaction between the spinel and the cathode material that would otherwise cause excessive volume expansion.As a result,the average thickness of the corrosion layer decreases from 518μm to 320μm,significantly enhancing the corrosion resistance of the saggar composite layer against cathode materials.
作者
刘伟正
李亚伟
徐义彪
王新杰
丁良盛
徐浩然
LIU Weizheng;LI Yawei;XU Yibiao;WANG Xinjie;DING Liangsheng;XU Haoran(State Key Laboratory of Advanced Refractories,Wuhan University of Science and Technology,Wuhan 430081,China;National-Provincial Joint Engineering Reasearch Center of High Temperature Materials and Lining Technology,Wuhan University of Science and Technology,Wuhan 430081,China;Joint International Research Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;WuhanWinning Technology Co.,Ltd.,Wuhan 431400,China)
出处
《武汉科技大学学报》
北大核心
2026年第2期102-108,共7页
Journal of Wuhan University of Science and Technology
基金
青海省科技成果转化专项项目(2023-GX-102)。
关键词
尖晶石-镁橄榄石复相骨料
匣钵复合层
锂电池正极材料
抗热震性能
抗侵蚀性能
spinel-forsterite multiphase aggregate
saggar composite layer
lithium-ion battery cathode material
thermalshock resistance
corrosion resistance
