人造石墨加工性能研究

Research on correlation of artificial graphite processing performance

选取不同物理指标(如吸油值、粒度、比表面积、振实密度)的人造石墨,采用锂离子电池常规湿法和干法配料工艺配制浆料,并涂布干燥得到负极片。然后对浆料和负极片进行粘度、细度、过筛时间、流变、压实密度、反弹等加工性能测试。结果表明:吸油值越大,粒度分布越广,比表面积越大,振实密度越小,浆料的流变性能越差;湿法配料工艺更容易获得分散网络稳定的浆料,干法配料工艺制得的合格浆料过筛时间短,但在高剪切力下会破坏浆料的分散网络,引起浆料沉降。该研究成果对人造石墨类材料的制造工艺改善和锂离子电池制造过程具有重要指导意义。

Artificial graphite with different physical indexes(such as oil absorption value,particle size,specific surface area,tap density)was selected,and the slurry was prepared by conventional wet and dry batching technology of lithium ion battery,and the negative electrode sheet was obtained by coating and drying.Then the slurry and the negative electrode were tested for viscosity,fineness,sieving time,rheology,compaction,rebound and other processing properties.The results show that the larger the oil absorption value,the wider the particle size distribution,the larger the specific surface area,the smaller the tapping,and the worse the rheological properties of the slurry;the wet batching process is easier to obtain a slurry with a stable dispersion network,and the sieving time of the qualified slurry prepared by the dry batching process is short,but the dispersive mesh of the slurry will be destroyed under high shearing force,and the slurry will precipitate.The research results have important guiding significance for the improvement of the manufacturing process of artificial graphite materials and the manufacturing process of lithiumion batteries.