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Method for preparing doped and modified lithium ferrous phosphate positive material of lithium battery

A technology of lithium iron phosphate and positive electrode materials, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low maximum capacity, low electrical conductivity and lithium ion mobility, and achieve improved mobility and improved doping effects , the effect of reasonable synthetic temperature

Active Publication Date: 2013-03-27
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems in the prior art that the lithium iron phosphate material has low conductivity and lithium ion mobility, and the maximum capacity after doping and modification is low, and provides a lithium battery doped modified phosphite The preparation method of lithium iron cathode material effectively controls the particle size of lithium iron phosphate material particles, improves the uniformity of material doping, and finally achieves the effect of improving the electrical properties of the material

Method used

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Examples

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Effect test

example 1

[0031] A method for preparing a lithium battery doped modified lithium iron phosphate positive electrode material, comprising the following process steps:

[0032] A. Take soluble ferric ion-containing compound and soluble doped metal compound as solute and deionized water as solvent respectively, and configure a solution with a solubility of 0.01mol / L. In the solution, soluble ferric ion-containing The compound and the soluble doping metal compound are uniformly mixed according to the molar ratio of Fe:M=(1-x):x to obtain a mixed solution of metal ions, wherein x=0.01;

[0033] B, use deionized water to dilute ammonia liquor, make the ammonia solution that concentration is 0.01mol / L;

[0034] C. Take the metal ion mixed solution described in step A and the ammonia solution described in step B respectively, place them in two containers at a molar ratio of 1:3, and inject the reaction at a flow rate of 1 mL / min respectively Vessel, use external heating equipment to maintain th...

Embodiment 2

[0039] A method for preparing a lithium battery doped modified lithium iron phosphate positive electrode material, comprising the following process steps:

[0040] A. Using soluble ferric ion-containing compounds and soluble doped metal compounds as solutes and deionized water as solvents, configure a solution with a solubility of 5mol / L. In the solution, the soluble ferric ion-containing compounds Mix evenly with the soluble doping metal compound according to the molar ratio of Fe:M=(1-x):x to obtain a mixed solution of metal ions, wherein x=0.04;

[0041] B, use deionized water to dilute ammonia liquor, make the ammonia solution that concentration is 5mol / L;

[0042] C. Take the metal ion mixed solution described in step A and the ammonia solution described in step B respectively, place them in two containers at a molar ratio of 1:3, and inject them into the reaction at a flow rate of 100mL / min respectively Container, use external heating equipment to maintain the temperature...

Embodiment 3

[0047] A method for preparing a lithium battery doped modified lithium iron phosphate positive electrode material, comprising the following process steps:

[0048] A. Use soluble ferric ion-containing compound and soluble doped metal compound as solute and deionized water as solvent respectively, and configure a solution with a solubility of 2.5mol / L. In the solution, soluble ferric ion-containing The compound and the soluble doping metal compound are uniformly mixed according to the molar ratio of Fe:M=(1-x):x to obtain a mixed solution of metal ions, wherein x=0.02;

[0049] B, use deionized water to dilute ammonia liquor, and make the ammonia solution that concentration is 2.5mol / L;

[0050] C. Take the metal ion mixed solution described in step A and the ammonia solution described in step B respectively, place them in two containers at a molar ratio of 1:3, and inject them into the reaction at a flow rate of 51mL / min respectively Container, use external heating equipment ...

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Abstract

The invention relates to a method for preparing a doped and modified lithium ferrous phosphate positive material of a lithium battery and belongs to the technology of the positive material of a lithium ion battery. The particle diameter of ferric phosphate prepared by using a precipitation method is small; the particle size of a lithium ferrous phosphate material prepared from the self-made ferric phosphate is nanoscale; and an ion-doped phosphate group compound prepared by using the precipitation method is fine and small in particle size, and thus the phosphate group compound can be uniformly mixed with the ferric phosphate, the follow-up full reaction is facilitated and the doping effect is improved; a solid state sintering method is adopted as the basis, the commercial application is convenient, and the doping technology is simple and practical; and a prepared LiFe(1-x)MxPO4(0(x(0.05)) material has excellent electrochemical performances, and the first discharge capacity under 1C multiplying power is not lower than 140mAh / g.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery cathode material, specifically, the invention relates to a preparation method of a lithium battery doped modified lithium ferrous phosphate cathode material, which belongs to the lithium ion battery cathode material technology. Background technique [0002] In recent years, various countermeasures have been taken to cope with the depletion of fossil fuels and prevent global warming. To address the issue of fossil fuels, we are actively introducing natural energy such as solar power and wind power. In terms of preventing global warming, start targeting CO 2 Emission reduction measures such as electrification and motor-assisted driving of high-emission vehicles have been implemented, but these measures have led to new issues such as power system instability and increased power consumption. To solve these issues, power storage components are essential. . Lithium-ion batteries have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 梁孜李明科郑威王睿
Owner DONGFANG ELECTRIC CORP LTD
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