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Lithium iron phosphate modification method

A lithium iron phosphate modification technology, which is applied in the field of lithium iron phosphate modification and lithium iron phosphate modification, can solve the problems of low specific capacity, poor second electrical conductivity, and poor low temperature performance of the third lithium iron phosphate battery. , to achieve the effect of improving conductivity, improving conductivity and stability

Inactive Publication Date: 2019-08-02
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second conductivity is poor, the diffusion speed of lithium ions is slow, and the actual specific capacity is low when charging and discharging at a high rate.
[0005] The low temperature performance of the third lithium iron phosphate battery is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for modifying lithium iron phosphate, using a metal oxide and carbon mixed coating method to modify lithium iron phosphate, according to the following steps:

[0020] Using 6g of lithium iron phosphate, 1g of transition metal oxysalt cobalt acetate and 3g of carbon source glucose as raw materials, put them in a ball mill jar, add a certain amount of ethanol, and mill in a ball mill for 4 hours;

[0021] The ball-milled sample was fully dried in a vacuum oven, and then heated to 600°C in a tube furnace under an argon atmosphere at a heating rate of 5°C / min and kept for 2 hours to obtain metal oxides and Carbon mixed coated lithium iron phosphate.

[0022] The performance of the modified lithium iron phosphate see figure 1 The first-efficiency performance diagram and figure 2 It is the discharge rate diagram of the metal oxide and carbon mixed-coated lithium iron phosphate material obtained in Example 1.

Embodiment 2

[0024] A method for lithium iron phosphate modification, according to the following steps:

[0025] Using 7g of lithium iron phosphate, 1g of transition metal oxo-salt nickel acetate and 2g of carbon source glucose as raw materials, put them in a ball mill jar, add a certain amount of ethanol, and mill in a ball mill for 4 hours;

[0026] The ball-milled sample was fully dried in a vacuum oven, and then heated to 600°C in a tube furnace under an argon atmosphere at a heating rate of 5°C / min and kept for 2 hours to obtain metal oxides and Carbon mixed coated lithium iron phosphate.

Embodiment 3

[0028] A method for lithium iron phosphate modification, according to the following steps:

[0029] Using 7g of lithium iron phosphate, 2g of transition metal oxo acid manganese acetate and 1g of carbon source sucrose as raw materials, put them in a ball mill jar, add a certain amount of ethanol, and mill in a ball mill for 4 hours;

[0030] The ball-milled sample was fully dried in a vacuum oven, and then heated to 600°C in a tube furnace under an argon atmosphere at a heating rate of 5°C / min and kept for 2 hours to obtain metal oxides and Carbon mixed coated lithium iron phosphate.

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Abstract

The invention relates to a modification method of a lithium iron phosphate material. The modified lithium iron phosphate material coated by a metal oxide and carbon is prepared in a ball milling mixing and high temperature calcining method by taking lithium iron phosphate, transition metal oxysal and a carbon source as material and enthanol as a solvent. Certain amount of LiFePO4, metal salt and carbon source are weighed, certain amount of the enthanol is added, ball milling is carried out to reach a fully mixing state, drying is carried out after ball milling, the mixture is calcined in a tubular furnace in the argon atmosphere, and the lithium iron phosphate material coated by the metal oxide and carbon is obtained. The metal oxide can effectively filling vacancy in the incomplete carbonlayer, the amorphous carbon can be tightly fixed to the surface of LiMnPO4. The metal oxide can improve the conductivity and stability of the material.

Description

technical field [0001] The invention relates to a lithium ion battery electrode material, in particular to a method for modifying lithium iron phosphate, specifically a method for modifying lithium iron phosphate by using a method of mixing and coating metal oxide and carbon. [0002] technical background [0003] Lithium-ion battery is a kind of energy storage device, which has the advantages of high voltage, high specific energy, and good safety. It is widely used in various electronic products, and the electrode material is the main factor affecting the performance of lithium-ion battery. [0004] Lithium iron phosphate is a new lithium ion battery electrode material. At present, many manufacturers around the world have started industrial production. It is characterized by large discharge capacity, low price, non-toxicity, and no environmental pollution. Countries around the world are competing to realize industrialized production. However, lithium iron phosphate materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 何丹农王亚坤张芳张道明卢玉英阳靖峰焦靖华
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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