What are the effects of electrolytes and diaphragm on the safety of lithium-ion batteries?

The effect of electrolytes and diaphragm on safety is mainly its characteristics.

The flammability and liquid state of widely used commercial electrolytes are not particularly desirable for safety. If lithium ion conductivity σ Li + & GT is used; The solid electrolyte of 104Scm1 can prevent the lithium crystal from piercing the diaphragm to reach the positive electrode to solve the safety problem. On the other hand, it can also solve the problem of the stability of the negative electrode in contact with the carbonate electrolyte and the positive electrode in contact with the aqueous electrolyte. problem. Of course, by using electrolytes with wider electrochemical Windows (especially LUMO), some flame retardant materials are added to the electrolyte. The modification of mixed Ionic liquids and organic liquid electrolytes into non-flammable electrolytes (at the same time, the Ionic conductivity σ Li will not be reduced too much) can also effectively improve safety.

The mechanical strength of the diaphragm (tensile and puncture strength), porosity, and whether it has a closing function are important grounds for determining its safety.

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