摘要
为改善钴酸锂正极材料用堇青石-莫来石质匣钵的性能,延长其使用寿命,以锂辉石细粉部分取代堇青石-莫来石质匣钵材料中的堇青石细粉,研究了锂辉石加入量对堇青石-莫来石质匣钵材料的非晶相含量、烧结性能、力学性能、物相组成和显微结构以及抗钴酸锂正极材料侵蚀性能的影响。结果表明:由于锂辉石的引入,体系由MgO-Al_(2)O_(3)-SiO_(2)变成Li_(2)O-MgO-Al_(2)O_(3)-SiO_(2)四元体系,其最低共熔温度降低,非晶相含量增加,材料气孔率降低,材料强度随锂辉石加入量的增加先升高后降低,当锂辉石加入量为4%(质量分数,下同)时,其常温抗折强度、耐压强度和1100℃热态抗折强度均达到最大值,分别为13.5 MPa、95.8 MPa和11.3 MPa。材料热震后残余抗折强度随锂辉石加入量的增加先升高后降低,残余强度保持率略微降低。当锂辉石加入量为4%时,材料抗钴酸锂正极材料侵蚀性能最佳。
In order to improve the properties of cordierite-mullite sagger and prolong its service life,spodumene fine powder is used to partially replace the cordierite fine powder in cordierite-mullite sagger materials.The effects of spodumene addition on the amorphous phase content,sintering properties,mechanical properties,phase composition and microstructure of cordierite-mullite sagger materials and corrosion resistance of lit-hium cobalt oxide cathode materials were studied.The results show that with the introduction of spodumene,the system changes from MgO-Al_(2)O_(3)-SiO_(2) to Li_(2)O-MgO-Al_(2)O_(3)-SiO_(2) quaternary system,the lowest eutectic temperature decreases,the content of amorphous phase increases,the porosity of the material decreases,and the strength of the sagger materials increases first and then decreases.When the spodumene addition is 4wt%,the cold modulus of rupture,cold crushing strength and hot modulus of rupture at 1100℃of the sagger material reach the maximum values,which are 13.5 MPa,95.8 MPa and 11.3 MPa,respectively.The residual flexural strength of the materials after thermal shock increases first and then decreases with the increase of spodumene addition,and the retention rate of residual strength decreases slightly.The sagger material with 4wt%spodumene addition has the best corrosion resistance to lithium cobalt oxide cathode.
作者
何思瑶
魏闯
康鑫
李素平
HE Siyao;WEI Chuang;KANG Xin;LI Suping(Henan Key Laboratory of High Temperature Functional Ceramics,Zhengzhou University,Zhengzhou 450052,China;CNPC Pipeline Research Institute,Langfang 065000,Hebei,China)
出处
《材料导报》
CSCD
北大核心
2023年第22期1-6,共6页
Materials Reports
基金
国家自然科学基金(51872266,52172031)
河南省科技攻关项目(222102230030)。
关键词
锂辉石
钴酸锂正极材料
匣钵
抗侵蚀性
spodumene
lithium cobalt oxide cathode material
agger
corrosion resistance
