Low-temperature lithium-ion battery

The invention relates to a low-temperature lithium-ion battery, which comprises a positive pole piece, a negative pole piece, a membrane, a low-temperature electrolyte and a housing, wherein each of the positive pole piece and the negative pole piece comprises a positive active material, a negative active material, a binder and a conductive agent; the positive active material is one or a mixture of more of a lithium cobalt oxide, lithium manganate and lithium iron phosphate and accounts for 80%-97% of total mass of a coating of the positive pole piece, the compaction density of the coating is 3.2-3.5 and the single-sided surface density of the coating of the positive pole piece is 50-210g/m ; the negative active material is synthetic graphite and accounts for 85%-95% of total mass of the coating of the negative pole piece, the compaction density of the coating is 1.2-1.45, the single-sided surface density of the coating of the negative pole piece is 40-110g/m ; and the low-temperature electrolyte is prepared