The invention discloses a hypervolume stable
lithium battery, the hypervolume stable
lithium battery comprises a positive
electrode, a negative
electrode, a
composite membrane and a nonaqueous
electrolyte; the nonaqueous
electrolyte comprises a
lithium salt, a
room temperature ionic liquid electrolyte and a composite additive, wherein the
room temperature ionic liquid electrolyte comprises a
quaternary ammonium salt cationic liquid and a cosolvent at the
mass ratio of 1:(0.1-0.5); and the
composite membrane comprises a multi-arc hole
fiber based membrane and an inorganic nanometer
coating on the surface of the multi-arc hole
fiber based membrane. Compared with the prior art, in the provided hypervolume stable
lithium battery and a preparation method of the hypervolume stable
lithium battery, the nonaqueous electrolyte uses an
ionic liquid to replace the traditional
organic solvent, the range of the
working temperature of the battery is expanded, the stability on the
metal lithium is good, the safety of the battery at the high-
power density is further improved, the potential safety
hazard of the battery is eliminated; the
composite membrane guarantees the better mechanical propertyand the electric
conductivity of the composite membrane, and meanwhile, the
thermal stability of the membrane is improved. Therefore, the hypervolume stable
lithium battery is higher in
ionic conductivity and excellent in
thermal stability,
chemical stability and electrochemical stability.