Preparation method of lithium ion battery material lithium iron phosphate

Abstract

The invention relates to a preparation method of lithium ion battery material lithium iron phosphate. According to the method, tail gas generated in the lithium ion phosphate high-temperature solid-phase method production process is efficiently purified, and a good technical effect and a remarkable economic and environmental benefit are achieved. An ammonia gas purifying tower is used for treating ammonia gas in the tail gas, finally a chemical fertilizer containing ammonium sulfate is obtained and used for sale, ammonium components in the burning process are effectively used, the cost of the mass production is reduced, the environment is protected, and the remarkable economic benefit is achieved. The nitrogen is used for exchanging heat with high-temperature tail gas, the nitrogen is preheated before the sintering, the heat of the tail gas is effectively used, the reaction rate and product purity can be improved, the energy is saved, and the energy consumption is further reduced. Carbon oxide in the tail gas is removed by adopting a carbon oxide adsorption agent, so that harmful gas in the tail gas is further reduced, and the environmental benefit is obvious.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of lithium iron phosphate, a lithium ion battery material. The method efficiently purifies the tail gas generated in the production process of lithium iron phosphate, turns waste into treasure, and has considerable benefits. economic and environmental benefits. Background technique [0002] As a high-energy chemical power source, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. . [0003] Lithium iron phosphate is a recently developed lithium-ion battery electrode material, mainly used in power lithium-ion batteries, as a positive electrode active material. It is also called lithium iron phosphate in the field, and its chemical formula is: LiFePO 4 . [0004] The advantages of lithium iron phosphate as an electrode material are: ① high en...

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Problems solved by technology

④No memory effect

However, harmful gases will be produced during the solid phase sintering process, the main components are ammonia, carbon dioxide, carbon monoxide and other harmful gases

[0006] In the prior art, there is no suitable treatment method for purifying the tail gas generated in the production process of the above-mentioned solid-phase sintering method of lithium iron phosphate. If the above-mentioned tail gas is directly discharged outside, it will bring great harm to the environment.

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