Graphene ultra-low temperature power lithium battery

Abstract

The invention discloses a graphene ultra-low temperature power lithium battery, comprising: a battery casing, a negative electrode insulating sheet, a battery core, a positive electrode insulating sheet and a cap. The cell includes a positive pole piece, a negative pole piece and a diaphragm. The positive electrode sheet includes a positive electrode current collector and a positive electrode material coating respectively arranged on both sides of the positive electrode current collector. The positive electrode material coating is made of a positive electrode material mixture coated on the surface of the positive electrode current collector. The positive electrode material mixture includes nanoparticle positive electrode material, positive electrode Binder, positive electrode mixed conductive agent and positive electrode solvent. Among them, the nanoparticle positive electrode material is lithium iron phosphate nanoparticles, and the positive electrode mixed conductive agent contains: 97-99 parts of positive electrode conductive agent base material, 0.2-0.4 parts of graphene, 0.2-0.4 parts of SP, and 0.2 parts by weight. ~0.4 parts KS-6.

Description

technical field [0001] The invention belongs to the technical field of rechargeable batteries, and in particular relates to a lithium ion battery. Background technique [0002] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. Lithium iron phosphate has an olivine structure and has excellent resistance to overcharge and overdischarge. It is widely used in the field of power batteries. Lithium iron phosphate is considered to be the most advanced battery due to its high safety, long cycle life, low price and environmental protection. Promising cathode active materials for lithium-ion power batteries. [0003] However, low-temperature performance has always been the bottleneck of lithium iron phosphate power batteries. Compared with other positive electrode active materials, the inherent poor electrical conductivity of lithium iron phosphate materials greatly limits its dynamic characteristics at...

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to overcome the above deficiencies in the prior art, to provide a graphene ultra-low temperature power lithium battery, to improve the low-temperature discharge performance of lithium iron phosphate power battery, and to solve the problem of low temperature of lithium iron phosphate power battery at a lower cost. Poor electrical conductivity of lithium iron phosphate, significant drop in electrical conductivity of positive / negative electrodes, poor electrolyte permeability, etc.

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