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Lithium vanadium phosphate/graphene composite material and preparation method thereof

A technology of lithium vanadium phosphate and composite materials, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of inability to effectively solve the problems of high-rate and sufficient electrical performance of lithium-ion batteries, and achieve the effect of simple and flexible preparation process.

Inactive Publication Date: 2012-03-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers usually use carbon sources such as high specific surface carbon, glucose or sucrose to prepare Li 3 V 2 (PO 4 ) 3 / C composite materials; but the materials often obtained cannot effectively solve the high-rate and sufficient electrical properties of lithium-ion batteries.

Method used

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  • Lithium vanadium phosphate/graphene composite material and preparation method thereof
  • Lithium vanadium phosphate/graphene composite material and preparation method thereof
  • Lithium vanadium phosphate/graphene composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Graphite oxide and deionized water were put into the container at a ratio of 1:10 (mg / mL), and after ultrasonication for 4 hours, a graphene oxide dispersion was obtained. After adding ascorbic acid solution, the ultrasonic wave was continued for 2 hours, and it was allowed to stand at room temperature for 20 hours to obtain Partially reduced graphene oxide dispersion in water as solvent. Add vanadium pentoxide and oxalic acid into deionized water at a molar ratio of 1:3, stir in a water bath at 80°C until dissolved, and then add Li 2 CO 3 and NH 4 h 2 PO 4 , continue to stir for 30min to obtain the precursor of lithium vanadium phosphate sol, which is added to the above-mentioned graphene oxide dispersion, wherein the mass ratio of lithium vanadium phosphate, graphene oxide and ascorbic acid is 40:1:1, continue to stir for 2h, and sonicate for 2h , dried at 80°C and ground, then pre-calcined at 350°C for 4 hours under nitrogen, and then calcined at 800°C for 8 hour...

Embodiment 2

[0025] Graphite oxide and deionized water were put into the container at a ratio of 1:5 (mg / mL). After ultrasonication for 4 hours, a graphene oxide dispersion was obtained. After adding 85% hydrazine hydrate, ultrasonication was continued for 4 hours to obtain a graphene oxide dispersion using water as a solvent. Partially reduced graphene oxide dispersion. Add vanadium pentoxide and oxalic acid into deionized water at a molar ratio of 1:3, stir in a water bath at 80°C until dissolved, and then add Li 2 CO 3 and NH 4 h 2 PO 4 , continue to stir for 30min to obtain the precursor of lithium vanadium phosphate sol, which is added to the above-mentioned graphene oxide dispersion, wherein the mass ratio of lithium vanadium phosphate, graphene oxide and hydrazine hydrate is 400:10:1, continue to stir for 2h, and ultrasonically 2h, dried at 80°C and ground, then pre-calcined at 350°C for 4h under nitrogen, and then calcined at 750°C for 12h to obtain lithium vanadium phosphate / g...

Embodiment 3

[0027] Graphite oxide and deionized water were put into a container at a ratio of 1:5 (mg / mL), and after ultrasonication for 4 hours, a graphene oxide dispersion was obtained. Add vanadium pentoxide and oxalic acid into deionized water at a molar ratio of 1:3, stir in a water bath at 80°C until dissolved, and then add Li 2 CO 3 and NH 4 h 2 PO 4, continue to stir for 30min, obtain the lithium vanadium phosphate sol precursor, join it in the above-mentioned graphene oxide dispersion liquid, continue ultrasonic 2h after adding the citric acid solution, wherein the mass ratio of vanadium phosphate lithium, graphene oxide and citric acid is 40: 1:4, continue to stir for 2 hours, dry at 80°C and grind, then pre-calcine at 350°C for 4 hours under argon, and then calcinate at 850°C for 4 hours to obtain lithium vanadium phosphate / graphene composite material. The graphene content in the sample was 2.8%.

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Abstract

The invention discloses a lithium vanadium phosphate / graphene composite material and a preparation method thereof. The lithium vanadium phosphate / graphene composite material consists of lithium vanadium phosphate and graphene or graphene and other amorphous carbon. The preparation method comprises the following steps: mixing oxidized graphite and deionized water, performing ultrasonic treatment, or further adding a reducing agent and then performing ultrasonic treatment; and adding a material or colloidal sol precursor for synthesizing lithium vanadium phosphate, water bathing at 60-90 DEG C while stirring, continuing ultrasonic treatment, drying and grinding, performing heat treatment in the presence of inert or reducing gas, and naturally cooling to room temperature to obtain the lithium vanadium phosphate / graphene composite material. The composite material prepared by using the method disclosed by the invention is used as the lithium ion battery anode material, the specific capacity of the composite material is up to 115 mAh.g<-1> in case of charging / discharging at 10C multiplying factor, and the composite material has nearly no attenuation after 500 cycles. The method has simple synthesis process and good repetitiveness, and provides an anode material with high capacity and long service life for the application of high multiplying factor lithium ion batteries.

Description

Technical field [0001] The invention involves an electrode material and its preparation methods in the field of battery technology, especially a lithium -ion battery positive composite material and its preparation methods that can be used for high magnification. Background technique [0002] As a high -performance green energy storage device, lithium -ion secondary batteries have the characteristics of good performance, safety, low cost, and environmental friendliness. In terms of energy generation and storage technology, it has a significant impact on the sustainable development of today's society.At present, it has been widely used in portable electronic products. It also has broad prospects in the areas of pilot vehicles, electric vehicles, and electric vehicles, and can also exert its unique advantages in solar energy and wind energy.The positive electrode material is the most critical factor for the development of left and right lithium -ion battery performance. [0003] At ...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 方建慧刘海东杨刚沈霞施利毅
Owner SHANGHAI UNIV
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