Electrolyte Resistance Performances of Aluminum-Plastic Films for Soft-Packed Lithium Batteries
To study the effects of the lithium battery aluminum-plastic film composite process on the performances of the aluminum-plastic film,this article analyzed the corrosion mechanisms of the electrolytes on the lithium battery aluminum-plastic films by measuring the peeling force of the heat-sealing layer/aluminum foil layer after soaking in the electrolytes with different compositions.The lithium battery aluminum-plastic films prepared by seventeen different composite processes(changing the pre-bonding temperature,pre-bonding time,curing temperature,and curing time)were used as the research objects to analyze the influences of composite processes on the electrolyte resistance and the peeling force of the heat-sealing layer/aluminum foil layer of the lithium battery aluminum-plastic films.The results show that the corrosion mechanisms of the electrolyte on the aluminum-plastic films are as follows:lithium hexafluorophosphate(LiPF6)in the electrolyte reacts with water(H2 O)to produce hydrofluoric acid(HF),which then erodes the adhesive interface of the heat-sealing layer/aluminum foil layer,causing the adhesive failure of the heat-sealing layer/aluminum foil layer.The composite processes would affect the peeling force of the aluminum-plastic film heat-sealing layer/aluminum foil layer and its electrolyte resistance.The higher the pre-bonding temperature,the longer the pre-bonding time,the higher the curing temperature,and the longer the curing time during the composite process,the higher the peeling force of the heat-sealing layer/aluminum foil layer and the better the electrolyte resistance.However,once it increases to a certain value,the effect no longer exists.Under the composite process of a pre-bonding temperature of 180℃,a pre-bonding time of 15 s,a curing temperature of 190℃,and a curing time of 40 s,the peeling force of the aluminum-plastic film heat-sealing layer/aluminum foil layer is the highest,and the electrolyte resistance is the best.When the process parameters are lower than these,the higher the pre-bonding temperature or curing temperature,the longer the pre-bonding time or curing time,the better the peeling force of the heat-sealing layer/aluminum foil layer,and the better electrolyte resistance.
Lithium BatteryAluminum-Plastic FilmPeeling ForceElectrolyteComposite Process
万方数据
维普
