摘要
Abstract
Silicon anodes has attracted widespread attention due to its extremely high specific capac-ity.Only minor amounts of Si added in the anode can significantly improve batteries specific capac-ity,but the huge volume expansion will limit its stability.In full-cells,the utilization rate of anode can be adjusted by changing the N/P ratio,and the lithium insertion depth of the silicon anode can be con-trolled,thereby changing its energy density and cycling performance.In this work,we produced pouch Li-ion batteries with three N/P ratios of 1.09,1.06,and 1.03.As the N/P ratio decreased,the battery quality decreased,the total silicon content decreased,the energy density and initial coulombic efficiency of the battery increased.However,during the cycling process,the lithium insertion and ex-traction depth of the silicon increased,and the volume expansion intensified,ultimately leading to a shortened cycling life.Therefore,introducing silicon into the LFP system and designing an appropri-ate N/P ratio is expected to improve the energy density of LFP system to 200 Wh/kg at the cost of cycle life.关键词
硅碳/N/P比/磷酸铁锂/能量密度/循环寿命Key words
Si-C/N/P ratio/lithium iron phosphate/energy density/cycle life分类
动力与电气工程
