Aerospace safe and high-power lithium ion storage battery

Abstract

The invention discloses an aerospace safe and high-power lithium ion storage battery, which comprises a positive electrode plate, a negative electrode plate, a separation membrane and electrolyte, wherein the positive and negative electrodes are separated by the separation membrane; the positive electrode plate comprises a positive electrode current collector and a positive electrode active coating layer coating the surface of the positive electrode current collector; the positive electrode active coating layer comprises positive electrode active substances; the positive electrode active substance is a mixed system formed by ingredients A and ingredients B; the ingredients A are at least one material from lithium cobalt oxides, nickel-cobalt lithium aluminate and nickel-cobalt lithium manganate; a conducting carbon layer coats the outer surfaces of materials of the ingredients A; the mass ratio of the conducting carbon layer to the ingredients A is (0.1 to 2):100; the thickness of the carbon layer is the nanometer level; the ingredients B are selected from at least one material from lithium manganate and lithium iron phosphate; and the mass percentage of the ingredients B accounting for the positive material active substances is 5 percent to 50 percent. Compared with the prior art, the aerospace safe and high-power lithium ion storage battery has the advantages that a mixed positive material system is used, so that the rate performance and the safety performance of an aerospace lithium ion battery can be greatly improved; and the application of the lithium ion battery to an aerospace power supply is expanded.

Description

technical field [0001] The invention belongs to the technical field of lithium ion accumulators, and in particular relates to a safe high-power lithium ion accumulator for hybrid system type space. Background technique [0002] Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have the advantages of higher energy density, long cycle life, and lower self-discharge rate. They have been widely used in various electronic products, new energy vehicles, and space In the satellite power subsystem. [0003] At present, lithium-ion batteries used in space energy storage power supply are all high specific energy type, and the specific energy of single battery is high, which is suitable for lightweight and long-life satellite power supply. With the continuous increase of space load on power system power requirements, high specific power lithium-ion batteries have attracted widespread attention due to their high specific p...

AI Technical Summary

Problems solved by technology

At present, the development of high-power lithium-ion battery technology used in space is relatively slow, and the corresponding technology is still immature. At the same time, because high-power lithium-ion batteries usually generate high heat when they are discharged with large currents, it is also crucial to improve the safety of batteries. important

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