锂电池正极材料LiNi_(x)Co_(y)Mn_(z)O_(2)承烧用莫来石-堇青石质匣钵的研制

Preparation of Mullite-Cordierite Sagger for Sintering Lithium Battery Cathode Material LiNi_(x)Co_(y)Mn_(z)O_(2)

莫来石-堇青石质匣钵对于制备高性能锂电池正极材料尤为重要。本文采用莫来石(1.18~0.6 mm)和堇青石(2~1 mm)为骨料,莫来石(0.074 mm)、煅烧氧化铝(0.044 mm)、佛山黄泥(0.044 mm)和煤矸石(0.044 mm)为基质,在1380℃下保温3 h烧结制备锂电池正极材料LiNi_(x)Co_(y)Mn_(z)O_(2)(LNCM)承烧用莫来石-堇青石匣钵,并采用埋覆侵蚀法探究了正极材料在烧结过程中对匣钵的侵蚀行为。结果表明:在1380℃下保温3 h烧结制备的匣钵力学性能和抗热震性均较好,其室温抗折强度为10.02 MPa,经3次热震循环后残余强度保持率在51.52%~53.26%;适当增加粗颗粒(1.18~0.6 mm)莫来石的含量可有效提高莫来石-堇青石匣钵的抗侵蚀性,且经侵蚀25次后匣钵表面的最大反应层厚度为447μm,最小反应层厚度为211μm。

Mullite-cordierite sagger is particularly important for the preparation of high-performance lithium battery cathode materials.In this paper,mullite(1.18~0.6 mm)and cordierite(2~1 mm)were used as aggregates,and mullite(0.074 mm),calcined alumina(0.044 mm),Foshan yellow mud(0.044 mm)and coal gangue(0.044 mm)were used as matrix.Mullite-cordierite sagger for lithium battery cathode material LiNi_(x)Co_(y)Mn_(z)O_(2)(LNCM)was prepared by sintering at 1380℃for 3 h.The corrosion behavior of cathode material on sagger during sintering process was investigated by burying corrosion method.The results show that the mechanical properties and thermal shock resistance of sagger sintered at 1380℃for 3 h are good.The flexural strength at room temperature is 10.02 MPa,and the residual strength retention rate is 51.52%~53.26%after three thermal shock cycles.The corrosion resistance of mullite-cordierite sagger can be effectively improved by appropriately increasing the content of coarse particles(1.18~0.6 mm)of mullite.After 25 times of erosion,the maximum reaction layer thickness on sagger surface is 447μm,and the minimum reaction layer thickness is 211μm.