Low-temperature lithium iron phosphate lithium-ion power battery

Abstract

The invention provides a low-temperature lithium iron phosphate lithium-ion power battery. The low-temperature lithium iron phosphate lithium-ion power battery comprises a positive plate, a negative plate, a membrane, electrolyte, a shell, a cover plate and a post terminal, wherein positive materials in the positive plate comprise a positive active material, a binding agent and a conductive agent, the positive active material is lithium iron phosphate which is subjected to nanocrystallization and is coated with a discontinuous graphene structure, the median diameter of the nanocrystallization lithium iron phosphate is 5-10nm, the graphene is 3-8 layers of multilayer graphene, and the coating area accounts for 40%-70% of the total surface area of the lithium iron phosphate material. The low-temperature lithium iron phosphate lithium-ion power battery has the advantages that the problem that the lithium iron phosphate lithium-ion power battery has poor low-temperature property is solved, the low-temperature lithium iron phosphate lithium-ion power battery has relatively excellent low-temperature property under the condition that other performance indexes are not lowered, the application range of the lithium iron phosphate lithium-ion power battery is greatly expanded, and the lithium iron phosphate lithium-ion power battery facilitates the popularization of electric cars in low-temperature areas and the normal use of the electric cars in cold winter.

Description

technical field [0001] The invention relates to a lithium ion storage battery, in particular to a low-temperature lithium iron phosphate lithium ion power battery. Background technique [0002] The shortage of petroleum resources and serious environmental pollution are two hot spots that are of great concern to the whole world. Among them, fuel vehicles are the focus of fuel consumption and the main source of air pollution, while electric vehicles are an effective means to alleviate energy and environmental protection problems. All countries are vigorously researching, Develop and industrialize products ranging from basic spare parts to complete vehicles. As a power battery for key components, lithium iron phosphate battery is recognized as one of the best batteries. It has the advantages of high safety performance, long cycle life, high storage capacity, and high temperature resistance. It can be widely used in miner's lamps, electric vehicles, electric tools, military com...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the current situation of poor low-temperature performance of lithium iron phosphate lithium-ion power batteries, to have more excellent low-temperature performance without reducing other performance indicators, and to greatly expand the application range of lithium iron phosphate lithium-ion power batteries , is conducive to the promotion of electric vehicles in low-temperature areas and the normal use of cold winters, and has important social and economic significance

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