Preparation method of lithium iron phosphate electrode formed by foam material and battery

A technology of lithium iron phosphate and foam materials, which is applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve problems such as unfavorable lithium iron phosphate battery applications, and achieve favorable penetration and diffusion, high electronic conductivity, Reduce the effect of concentration polarization

Inactive Publication Date: 2021-06-08
SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium iron phosphate electrode has the advantages of thin coating layer and large electrode area, but there are serious problems in the rate performance and heat dissipation rate, which is not conducive to the application of lithium iron phosphate batteries in the field of high power density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Lithium hydroxide (lithium source), ferrous sulfate (iron source), phosphoric acid (phosphorus source) and ethanol are prepared as a precursor solution, and the molar ratio of lithium, iron, and phosphorus is 1:1:1. Put the precursor solution and carbon foam together into a polytetrafluoroethylene-lined autoclave, and maintain the temperature at 150°C for 24 hours. After natural cooling, take out the foam material, at this time, lithium iron phosphate is deposited in the pores of the foam material in situ, and the loading capacity of lithium iron phosphate is 2g / cm 2 .

[0030] The lithium iron phosphate electrode is roll-formed and disassembled to the required size for battery assembly.

[0031] The lithium iron phosphate electrode is assembled with commercial graphite as the positive and negative electrodes to form a lithium iron phosphate single battery. The electrolyte composition includes: ethylene carbonate (EC) and dimethyl carbonate (DMC) with a volume ratio of...

Embodiment 2

[0041] The basic requirements for electrode fabrication, battery assembly and testing are the same as in Example 1. The main differences are explained below:

[0042] Lithium hydroxide (lithium source), ferrous sulfate (iron source), phosphoric acid (phosphorus source) and water are prepared into a precursor solution. The foam material is aluminum foam. The temperature of the solvothermal reaction is 180° C., and the time is 16 hours. The loading capacity of lithium iron phosphate is 5g / cm 2. After testing, the sheet resistance of the pole piece is: 0.31Ohm; the diffusion coefficient of lithium ions is: 3.43×10 -11 cm 2 / s.

[0043] The charging and discharging system is 25°C, 20C, 2.0~4.2V; the discharge capacity densities of lithium iron phosphate single battery for the first time and 1000 times are 145mAh / g and 133mAh / g respectively.

Embodiment 3

[0045] The basic requirements for electrode fabrication, battery assembly and testing are the same as in Example 1. The differences are mainly explained below: lithium hydroxide (lithium source), ferrous sulfate (iron source), phosphoric acid (phosphorus source) and water are prepared into a precursor solution. The foam material is titanium foam. The temperature of the solvothermal reaction is 170° C., and the time is 12 hours. The loading capacity of lithium iron phosphate is 4g / cm 2 . After testing, the sheet resistance of the pole piece is: 0.35Ohm; the diffusion coefficient of lithium ions is: 3.46×10 -11 cm 2 / s.

[0046] The charging and discharging system is 25°C, 20C, 2.0~4.2V; the discharge capacity densities of the lithium iron phosphate single battery for the first time and 1000 times are 143mAh / g and 134mAh / g respectively.

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Abstract

The invention provides a preparation method of a lithium iron phosphate electrode formed by a foam material and a battery. The lithium iron phosphate electrode obtained based on the preparation method has excellent rate capability. The preparation method of the lithium iron phosphate electrode formed by the foam material comprises the steps of loading lithium iron phosphate on the foam material, then carrying out roll forming, and splitting to a required size to obtain the lithium iron phosphate electrode, preferably, the lithium iron phosphate loading capacity of the lithium iron phosphate electrode is 1-5g / cm<2>.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate electrode, in particular to a preparation method of a foam material-formed lithium iron phosphate electrode. Background technique [0002] Lithium iron phosphate is a commonly used electrode material for lithium-ion batteries, which has the advantages of good cycle stability and the disadvantages of low electronic conductivity and low ion diffusion coefficient. The manufacturing method of the lithium iron phosphate electrode is mainly to prepare the lithium iron phosphate active material into a slurry and coat it on the surface of the aluminum foil. The lithium iron phosphate electrode has the advantages of a thin coating layer and a large electrode area, but there are serious problems in rate performance and heat dissipation rate, which is not conducive to the application of lithium iron phosphate batteries in the field of high power density. In order to improve the high-curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/04H01M10/0525
CPCH01M4/136H01M4/1397H01M4/0435H01M10/0525Y02E60/10
Inventor 陈东许立军曹建武徐靓苗家兵马越范瑞成常宁王永旺
Owner SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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