Preparation method of lithium ion battery material lithium iron phosphate

A lithium ferrous phosphate and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as environmental hazards and no memory effect, and achieve the effects of easy desorption, good technical effects, and increased adsorption capacity

Active Publication Date: 2015-09-02
RIZHAO HUAXUAN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Preparation method of lithium ion battery material lithium iron phosphate

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Embodiment 1

[0034]A preparation method of lithium iron phosphate lithium ion battery material, comprising the steps of:

[0035] Step (1), select raw materials for preparing lithium ferrous phosphate and prepare lithium ferrous phosphate product with high-temperature solid-state reaction method; The raw materials described in step (1) are iron source, phosphorus source, lithium source, specific iron source, phosphorus Source, lithium source are ferrous oxalate, ammonium dihydrogen phosphate, lithium carbonate respectively; Described high-temperature solid-state reaction method is: according to the molar ratio of iron source: phosphorus source: lithium source=1:1:1 mixing and grinding; After grinding and drying, transfer the material to a pre-calcining furnace for calcination at 600°C under a nitrogen atmosphere. The sintering time is 1 hour. After the first sintering, the material is ball-milled, and then the second sintering is carried out. The temperature of the second sintering is 650°C...

Embodiment 2

[0045] A preparation method of lithium iron phosphate lithium ion battery material, comprising the steps of:

[0046] Step (1), select raw materials for preparing lithium ferrous phosphate and prepare lithium ferrous phosphate product by high-temperature solid-state reaction method. The raw materials described in step (1) are iron source, phosphorus source and lithium source, and the specific iron source, phosphorus source and lithium source are respectively ferrous oxalate, ammonium dihydrogen phosphate and lithium carbonate. The high-temperature solid-phase reaction method is: mixing and grinding according to the molar ratio of iron source: phosphorus source: lithium source = 1:1:1. After grinding and drying, the material is transferred to a pre-calcining furnace for calcination under a nitrogen atmosphere at 700°C. The sintering time is 5 hours. After the first sintering, the material is ball-milled, and then the second sintering is carried out. The temperature of the secon...

Embodiment 3

[0055] A preparation method of lithium iron phosphate lithium ion battery material, comprising the steps of:

[0056] Step (1), select raw materials for preparing lithium ferrous phosphate and prepare lithium ferrous phosphate product by high-temperature solid-state reaction method. In step (1), iron source, phosphorus source, lithium source and carbon source are weighed, and specific iron source, phosphorus source, lithium source and carbon source are respectively ferrous oxalate, ammonium dihydrogen phosphate, lithium carbonate and glucose. The added amount is iron:phosphorus:lithium=1:1:1 (molar ratio), and the molar ratio of glucose to lithium source is 0.2:1. The high-temperature solid-phase reaction method is: mixing and grinding the raw materials according to the molar ratio. After grinding and drying, transfer the material to a pre-calcining furnace for calcination at 600°C under a nitrogen atmosphere. The sintering time is 1 hour. After the first sintering, the mater...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCB01D53/02B01D2253/25B01D2257/502C01B25/45C01C1/242C05C3/00H01M4/5825Y02E60/10Y02P20/50
Inventor 王海峰谷亦杰朱友坤
Owner RIZHAO HUAXUAN NEW ENERGY
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