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Preparation method of lithium iron phosphate compound material

A technology of lithium ferrous phosphate and composite materials, which is applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve the problems of inability to balance rate performance and tap density, and achieves improved electrochemical performance, easy industrialization, and the solution of tap density. low density effect

Active Publication Date: 2012-03-21
GREAT POWER BATTRY ZHUHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a preparation method of lithium ferrous phosphate composite material, aiming to solve the problem that the rate performance and tap density cannot be balanced when it is used as the positive electrode material of lithium ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] According to Fe 2+ :PO 4 3- :M molar ratio 0.98:1:0.02 Weigh FeSO 4 ·7H 2 O(AR), H 3 PO 4 (AR), Ni(NO) 2 (AR) mix, add a small amount of distilled water, stir to dissolve. Li again + :PO 4 3- LiOH·H with a molar ratio of 3:1 2 Slowly add the O solution into the mixture, mix well, adjust the pH value to 7-11, and then move it into the autoclave. Fill the autoclave with pure nitrogen and seal it. Stirring was performed at 180° C. for 5 hours at a speed of 300 r / min. After the reaction, cool to room temperature, filter with Buchner funnel, and wash with deionized water several times. Dry in a vacuum oven at 90°C for 1 hour. Put the dry matter into a tube furnace, feed pure nitrogen, heat up to 600°C, keep it warm for 4 hours, cool to room temperature, take it out, and get LiFe 0.98 Ni 0.02 PO 4 sample.

[0025] LiFe 0.98 Ni 0.02 The PO4 sample is put into a sensitization solution composed of 20g / L tin dichloride and 50ml / L hydrochloric acid (37% HCl) fo...

example 2

[0029] According to Fe 2+ :PO 4 3- Molar ratio 1:1: Weigh FeCl 2 4H 2 O(AR), H 3 PO 4 (AR) mix, add a small amount of distilled water, stir to dissolve. Li again + :PO 4 3- LiOH·H with a molar ratio of 3:1 2 Slowly add the O solution into the mixture, mix well, adjust the pH to 7-11, and then move it into a high-pressure reactor. Fill the autoclave with pure argon and seal it. Stirring was performed at 180° C. for 5 hours at a speed of 300 r / min. After the reaction, cool to room temperature, filter with Buchner funnel, and wash with deionized water several times. Dry in a vacuum oven at 90°C for 1 hour. Put the dry matter into a tube furnace, feed pure argon, heat up to 600°C, keep it warm for 4 hours, cool to room temperature, take it out, and get LiFePO 4 sample.

[0030] LiFePO 4 The sample is put into a sensitization solution composed of 20g / L tin dichloride and 50ml / L hydrochloric acid (37% HCl) for sensitization. Vacuum filter and wash several times with...

example 3

[0034] According to Fe 2+ :PO 4 3- Molar ratio 1:1: Weigh FeCl 2 4H 2 O(AR), H 3 PO 4 (AR) mix, add a small amount of distilled water, stir to dissolve. Li again + :PO 4 3- LiOH·H with a molar ratio of 2.8:1 2 Slowly add the O solution into the mixture, mix well, adjust the pH to 7-11, and then move it into a high-pressure reactor. Fill the autoclave with pure nitrogen and seal it. Stirring was performed at 190° C. for 5 hours at a speed of 250 r / min. After the reaction, cool to room temperature, filter with Buchner funnel, and wash with deionized water several times. Dry in a vacuum oven at 90°C for 1 hour. Put the dry matter into a tube furnace, feed pure argon, raise the temperature to 550°C, keep it warm for 4 hours, cool to room temperature, take it out, and get LiFePO 4 sample.

[0035] LiFePO 4 The sample is put into a sensitization solution composed of 20g / L tin dichloride and 50ml / L hydrochloric acid (37% HCl) for sensitization. Vacuum filter and wash...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate compound material for the anode material of a lithium ion battery. In the method, a hydrothermal synthesis method is firstly adopted to prepare spherical lithium iron phosphate material with high tap density; and then aiming at the problem of low conductivity of the lithium iron phosphate material, a chemical plating methodis adopted to carry out surface coated metal or metal alloy coating on the lithium iron phosphate material so as to improve the electrochemical property of the lithium iron phosphate material. The invention overcomes the defects of low electronic conductivity and low tap density, and has simple preparation method and easy industrialization.

Description

technical field [0001] The invention relates to a production process of a lithium ion battery, in particular to a preparation method for a lithium iron phosphate composite material used as a positive electrode material of the lithium ion battery. Background technique [0002] With the development of industrialization, urbanization, and the expansion of population, a large amount of fossil energy such as coal and oil has been developed, resulting in CO in the atmosphere 2 increase in greenhouse gas levels. Statistics show that the concentration of carbon dioxide in the earth's atmosphere has risen from 280ppm before the industrial revolution to 380ppm, and will inevitably reach 450ppm in 40 years. At the end of the last century, the earth's surface temperature rose by about 0.6 degrees, and this century is expected to rise by 1.4 degrees to 5.8 degrees. In this context, how to vigorously develop "zero carbon emission" energy is very meaningful. [0003] As an energy storag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/58H01M4/38
CPCY02E60/12Y02E60/10
Inventor 卢阳崔明许汉良张帆陈京才
Owner GREAT POWER BATTRY ZHUHAI