The routine diaphragm has a general affinity for organic electrolytes, but its good wettability and liquid retention greatly impact the performance of lithium-ion batteries.
Use formula 6 to calculate the lithium-ion migration number of the routine diaphragm, ZnO modified diaphragm, and ZnB modified diaphragm. The lithium-ion migration numbers of ZnB modified diaphragm are 0.41, while the lithium-ion migration numbers of ZnO modified diaphragm and routine diaphragm are 0.3 and 0.21.
The results show that the zinc borate modified diaphragm increases the lithium-ion migration number of the battery. This is because the Lewis acid sites of zinc borate can absorb anions in the battery system, and the increase in the migration number of lithium ions will help improve rate performance .
The lithium-ion migration numbers of ZnB modified diaphragm are 0.41, while the lithium-ion migration numbers of ZnO modified diaphragm and routine diaphragm are 0.3 and 0.21. When the battery is working, the charge transfer rate of lithium ions reflects the charging and discharging characteristics of the battery.
The modified LiCoO 2 /Li battery released a discharge capacity of 125 mAh g −1 at a current density of 1 C . A simple sol-gel coating method is used to uniformly deposit a thin layer of titanium dioxide on the PP diaphragm. The LiFePO 4 /Li battery with PP@TiO 2 diaphragm has a high capacity of 92.6 mAh g −1 at 15C .
The electrochemical performance test results show that the modification of zinc borate can effectively improve the comprehensive performance of the PE diaphragm and the overall cycle stability and rate performance of the lithium iron phosphate battery. 1. Introduction
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