The invention relates to a preparation method of an ultralow-temperature high-rate type
lithium ion cell. The preparation method of the ultralow-temperature high-rate type
lithium ion cell provided by the invention comprises the following steps of: (A) uniformly mixing
lithium cobalt oxide, an electric conduction agent, PVDF (
polyvinylidene fluoride) or PVDF / HFP (
hexafluoropropylene) by adopting NMP(
nuclear matrix protein) as a dissolvant so as to prepare positive pole
slurry; (B) uniformly spraying the positive pole
slurry on a positive pole
current collector by utlizing an atomization spray gun, and
drying, rolling and
cutting pieces to form a positive
pole piece; (C) uniformly mixing a negative pole material, the electric conduction agent, the PVDF or PVDF / HFP by adopting the NMP as the dissolvant so as to prepare negative pole
slurry; (D) uniformly spraying the negative pole slurry on a negative pole
current collector by using the atomization spray gun, and
drying, rolling and
cutting pieces to form a negative
pole piece; and (E) laminating or winding the prepared positive and negative pole pieces and a polyolefine diaphragm into an electric core, encapsulating the electric core through an
aluminium plastic film, injecting an electrolytic solution after
vacuum drying, standing to form the lithium
ion cell. Compared with the prior art, the preparation method provided by the invention has the advantages that the lithium
ion migration journey is shortened, the charge-
discharge property is improved, the removing of the dissolvant is easy, the
energy consumption of equipment is less, and the technological process is environment-friendly.