磷酸铁锂正极匀浆工艺研究

Optimized Process of Mixing Anode Slurry for LiFePO4 Battery

以LiFePO4为活性材料,SP和CNT为导电剂,PVDF为粘结剂制作锂离子动力电池正极浆料,并制作成正极片。采用细度、极片剥离强度、电阻率、SEM等方法研究正极浆料的均一性。结果表明,纳米级活性材料LiFePO4与纳米级导电剂SP和CNT在传统匀浆工艺中存在不同程度的团聚,通过优化匀浆工艺,能够改善活性材料与导电剂分散效果。优化匀浆工艺之后,活性材料与导电剂、粘结剂分散均匀;浆料细度达到3μm,极片剥离强度达到22.08N/m,电阻率为3.943Ω·cm,SEM结果表明,LiFePO4与SP和CNT分布均匀。

Anode slurry which consists of active material (LiFePO4), conductor (SP and CNT) and binder (PVDF) was mixed uniformly by an optimized process and applied in Li-ion power battery. The uniformity of slurry was researched by means of slurry fineness, electrode peeling strength, resistivity and SEM. It is found that slurry mixed by the optimized process showed improved uniformity, which was resulted from higher dispersion of active material, conductor and binder on nanoscale, while in traditional process they clustered. SEM images agreed with the result. Properties of slurry such as fineness of 3 μm, peeling strength of 22.08 N/m and resistivity of 3.943 Ω·cm were reached.