Lithium iron phosphate preparing method

Abstract

Disclosed is a lithium iron phosphate preparing method.. The lithium iron phosphate preparing method can efficiently purify exhaust generated during production of lithium iron phosphate through the high-temperature solid state method and obtain good technical effects and considerable economic and environmental benefits. According to the lithium iron phosphate preparing method, ammonia gas in exhaust gas is processed through an ammonia gas purifying tower to obtain fertilizer containing ammonium sulfate for sale, so that ammonia content during a roasting process can be effectively utilized, the cost of scale production can be reduced, environment protection can be achieved and considerable economic benefits can be obtained; the ammonia gas exchanges heat with high-temperature exhaust, so that ammonia can be preheated before roasting, heat of the exhaust can be effectively utilized, reaction rate and product purity can be improved, energy can be saved and energy consumption can be further reduced; carbon monoxide absorbent are used for removing carbon monoxide in the exhaust, so that harmful gas can be further reduced, and significant environmental benefits can be achieved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and is a branch case of the invention patent application "A Preparation Method for Lithium-Ion Battery Material Lithium Ferrous Phosphate" (application number: 2015102532337). Specifically, it relates to a preparation method of lithium iron phosphate. The method efficiently purifies tail gas generated in the production process of lithium iron phosphate, and has considerable economic and environmental benefits by turning waste into treasure. 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...

AI Technical Summary

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.