Modified positive electrode material for lithium iron phosphate battery and preparation method of modified positive electrode material and lithium-ion battery

A technology of lithium iron phosphate battery and positive electrode material, applied in battery electrodes, batteries, secondary batteries, etc., can solve problems such as poor charge-discharge performance and cycle performance, improve battery electrochemical performance, reduce battery internal resistance, The effect of reducing drag

Inactive Publication Date: 2017-04-26
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of poor charge and discharge performance and cycle performance of existing lithium iron phosphate power batteries in low temperature environments, and provide an ideal modified lithium iron phosphate battery positive electrode material and its preparation method, lithium ion battery

Method used

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  • Modified positive electrode material for lithium iron phosphate battery and preparation method of modified positive electrode material and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] ① Weigh 18g of ethylenediamine and dissolve it in 80ml of deionized water, add 23.1g of zirconium oxynitrate, stir ultrasonically for 30min, filter with suction, and dry the obtained solid in an air drying oven at 80°C for 12h to obtain a white solid, that is, zirconium-doped Carbon precursors.

[0034] ② Place the zirconium-doped carbon material precursor prepared in step ① in a place filled with N 2 In a tube furnace, the temperature was raised to 320 °C at a heating rate of 5 °C / min, kept for 5 h, and then cooled to room temperature at a cooling rate of 5 °C / min to obtain a zirconium-doped carbon material.

[0035] ③ Disperse 12.5g of lithium iron phosphate and 0.25g of the zirconium-doped carbon material obtained in step ② in deionized water, transfer the resulting solution to a high-pressure reactor, place the reactor in a dynamic reactor, and adjust The rotation speed of the reactor was 20r / min, the mixture was subjected to hydrothermal treatment at 140°C for 14h...

Embodiment 2

[0037] ①Weigh 31g of diethylenetriamine and dissolve it in 80ml of deionized water, add 42.9g of zirconium nitrate pentahydrate, stir ultrasonically for 20min, filter with suction, and dry the obtained solid in an air drying oven at 60°C for 14h to obtain a white solid. That is, zirconium-doped carbon material precursor.

[0038] ② Place the zirconium-doped carbon material precursor prepared in step ① in a place filled with N 2 In a tube furnace, the temperature was raised to 300 °C at a heating rate of 3 °C / min, kept for 3 h, and then cooled to room temperature at a cooling rate of 5 °C / min to obtain zirconium-doped carbon materials.

[0039] ③ Disperse 12.5 g of lithium iron phosphate and 0.25 g of the zirconium-doped carbon material obtained in step ② in deionized water, and transfer the resulting solution to an autoclave. The reactor was placed in a dynamic reactor, the rotation speed of the reactor was adjusted to 15 r / min, and the mixture was subjected to hydrothermal t...

Embodiment 3

[0041] ① Weigh 43.9g of triethylenetetramine and dissolve it in 80ml of deionized water, add 32.7g of zirconium isopropoxide, stir ultrasonically for 30min, filter with suction, and dry the obtained solid in an air drying oven at 80°C for 12h to obtain a white solid. That is, zirconium-doped carbon material precursor.

[0042]② Place the zirconium-doped carbon material precursor prepared in step ① in a place filled with N 2 In a tube furnace, the temperature was raised to 320 °C at a heating rate of 5 °C / min, kept for 5 h, and then cooled to room temperature at a cooling rate of 5 °C / min to obtain a zirconium-doped carbon material.

[0043] ③ Disperse 12.5 g of lithium iron phosphate and 0.25 g of the zirconium-doped carbon material obtained in step ② in deionized water, and transfer the resulting solution to an autoclave. The reactor was placed in a dynamic reactor, the rotation speed of the reactor was adjusted to 20 r / min, and the mixture was subjected to hydrothermal trea...

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Abstract

The invention discloses a modified positive electrode material for a lithium iron phosphate battery and a preparation method of the modified positive electrode material. The preparation method comprises the following steps of (1) carrying out mixed reaction and drying on a compound A and a compound B to obtain a zirconium-doped carbon material precursor; (2) sintering the zirconium-doped carbon material precursor obtained in the step (1) to obtain a zirconium-doped carbon material; and (3) carrying out mixed reaction and drying on lithium iron phosphate and the zirconium-doped carbon material obtained in the step (2) to obtain the modified positive electrode material for the lithium iron phosphate battery, wherein the compound A is the compound capable of providing a carbon source and a nitrogen source and the compound B is the compound capable of providing a zirconium source. Compared with the prior art, the modified positive electrode material for the lithium iron phosphate battery has the advantages that the lithium iron phosphate is modified through the zirconium-doped amorphous carbon material, the resistance of lithium ion migration is reduced, volume expansion of the material in the charge-discharge process is improved, the carbon material is prevented from falling off and the modified positive electrode material has a good application prospect. The invention further discloses a lithium-ion battery.

Description

technical field [0001] The invention belongs to the field of new energy materials, and more specifically, the invention relates to an ideal modified lithium iron phosphate cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium iron phosphate batteries have the characteristics of good safety and high energy density, and have become the mainstream batteries in power batteries. However, in a low temperature environment, the resistance of lithium ions to escape from the positive electrode material and migrate in the electrolyte increases, and the charge and discharge performance and cycle performance of the lithium iron phosphate battery decrease sharply. Therefore, to improve the lithium iron phosphate battery in a low temperature environment The charge-discharge performance and cycle performance are of great significance. [0003] Some people use metal ions to dope lithium iron phosphate to improve the intrinsic conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/62H01M4/626H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 杨泛明焦奇方
Owner OPTIMUM BATTERY CO LTD
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