Preparation method of anode material of lithium-ion power battery lithium vanadium phosphate

A technology for power batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of large investment in industrial production equipment, cumbersome gel making process, and poor cycle stability, so as to facilitate industrial production and electrochemical reactions. The effect of many active sites and long cycle life

Inactive Publication Date: 2011-06-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the solid-phase method is simple to operate, the primary particle size of the product is large and the cycle stability is poor; in the sol-gel method, the gel molecules are small, the raw materials are fully mixed, and the product quality is high, but the gel preparation process is too cumbersome ; The hydrothermal method requires the pressure of the reactor to reach more than 20 atmospheres, the investment in industrial production equipment is large, and the safety hazard is large

Method used

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  • Preparation method of anode material of lithium-ion power battery lithium vanadium phosphate
  • Preparation method of anode material of lithium-ion power battery lithium vanadium phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1) Prepare white turbid NH with a concentration of 50 g / L with deionized water 4 VO 3 Solution and LiOH·H with a concentration of 100 g / L 2 O aqueous solution, LiOH·H 2 Add O aqueous solution to NH 4 VO 3 Stir evenly in the white turbid solution until the solution becomes clear;

[0025] 2) Add hydrazine hydrate dropwise to the solution prepared in step 1) until the solution turns light yellow;

[0026] 3) Use deionized water to prepare (NH) with a concentration of 100 g / L 4 ) 2 HPO 4 Aqueous solution, and then add this aqueous solution to the light yellow solution in step 2) to obtain a brown-black solution;

[0027] 4) Add NH to the brown-black solution 4 VO 3 1,4-butynediol with a mass of 20%, add ammonia while stirring to adjust the pH of the solution to 10;

[0028] 5) Place the solution obtained in step 4) in a polytetrafluoroethylene reactor, fully react at 180 °C, rinse with deionized water, and dry to obtain precursor powder; then, under 700 °C, argon protection, The p...

Embodiment 2

[0033] 1) Prepare white turbid NH with a concentration of 70 g / L with deionized water 4 VO 3 Solution and LiOH·H with a concentration of 120 g / L 2 O aqueous solution, LiOH·H 2 Add O aqueous solution to NH 4 VO 3 Stir evenly in the white turbid solution until the solution becomes clear;

[0034] 2) Add hydrazine hydrate dropwise to the solution prepared in step 1) until the solution turns light yellow;

[0035] 3) Prepare (NH) with a concentration of 110 g / L with deionized water 4 ) 2 HPO 4 Aqueous solution, and then add this aqueous solution to the light yellow solution in step 2) to obtain a brown-black solution;

[0036] 4) Add NH to the brown-black solution 4 VO 3 1,4-butynediol with a mass of 40%, add ammonia while stirring to adjust the pH of the solution to 12.5;

[0037] 5) Place the solution obtained in step 4) in a polytetrafluoroethylene reactor, fully react at 200 °C, rinse with deionized water, and dry to obtain precursor powder; then, under 750 °C, argon protection, The p...

Embodiment 3

[0042] 1) Prepare white turbid NH with a concentration of 100 g / L with deionized water 4 VO 3 Solution and LiOH·H with a concentration of 140 g / L 2 O aqueous solution, LiOH·H 2 Add O aqueous solution to NH 4 VO 3 Stir evenly in the white turbid solution until the solution becomes clear;

[0043] 2) Add hydrazine hydrate dropwise to the solution prepared in step 1) until the solution turns light yellow;

[0044] 3) Prepare (NH) with a concentration of 120 g / L with deionized water 4 ) 2 HPO 4 Aqueous solution, and then add this aqueous solution to the light yellow solution in step 2) to obtain a brown-black solution;

[0045] 4) Add NH to the brown-black solution 4 VO 3 1,4-Butynediol with a mass of 60%, add ammonia while stirring to adjust the pH of the solution to 14;

[0046] 5) Put the solution obtained in step 4) in a polytetrafluoroethylene reactor, fully react at 220 °C, rinse with deionized water, and dry to obtain precursor powder; then, under the protection of 800 °C and argon,...

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Abstract

The invention discloses a preparation method of an anode material of lithium-ion power battery lithium vanadium phosphate, comprising the following steps: adding a LiOH.H2O aqueous solution into the white turbid aqueous solution of NH4VO3, and stirring until the solution is clear; then, adding a nodularizer hydrazine hydrate dropwise until the solution becomes yellowish; adding an (NH4)2HPO4 aqueous solution into the above yellowish solution to cause the solution to gradually become brownish black; adding 1,4-butynediol into the above brownish black solution, and stirring; adjusting the pH to10-14; drying the obtained solution in a kettle to obtain precursor powder; and finally, at the temperature of 700-800 DEG C, calcining the precursor powder under the protection of argon to obtain the porous spherical anode material of lithium vanadium phosphate. The lithium-ion battery prepared from the anode material of lithium vanadium phosphate prepared by the method in the invention has the characteristics of high specific capacity, long cycle life, good charging and discharging performances with high multiplying power and the like.

Description

Technical field [0001] The invention relates to a method for preparing a positive electrode material for a lithium ion battery, in particular to a method for preparing a lithium vanadium phosphate positive electrode material for a lithium ion power battery. Background technique [0002] The development of new energy and renewable clean energy is an important way to solve the energy crisis and environmental problems. Lithium-ion batteries, as the latest generation of secondary batteries, have developed rapidly since they came out in 1990. Compared with commonly used secondary batteries such as lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have the advantages of high open-circuit voltage, high energy density, long service life, no memory effect, no pollution, and small self-discharge. At present, lithium-ion batteries have been widely used in mobile phones, notebook computers, video cameras and household appliances, and are act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 涂江平乔彦强程丽娟周俊平王秀丽谷长栋
Owner ZHEJIANG UNIV
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