Laboratory Preparation and Influence Factor Analysis of LiFePO4 Soft Package Battery

LiFePO4 soft package battery has been widely used in industry because of its high working voltage, low cost, good thermal stability and high security. However, there are so many steps to prepare a commercial soft package battery and the required equipments are too complex for one to complete all the operations. Also, the proportion of materials in each company is different and not completely public available, which makes it hard to analyze the changes of material structure after various treatments. Therefore, a simplified preparation of the LiFePO4 soft package full battery in laboratory needs to be realized for comparison and analysis in the follow-up study. In this paper, the laboratory simplified preparation process of LiFePO4 soft package battery was introduced in details. The morphology and cycle performance of three batteries with three different ratios of active materials, conductive agents and binders in the cathode material were studied. It was found that the battery with the mass ratio of 92:6.5:7 had the highest discharge platform (3.3 V), the largest specific capacity (153.4 mAh/g) and cycle retention rate. These discussions provide a good reference to repair and improve the industrial soft package full battery.