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Vanadium pentoxide-lithium borate-graphene glass positive electrode material and preparation method and application thereof

A cathode material, graphene technology, applied in the field of V2O5-LiBO2-graphene glass cathode material and its preparation, can solve the problems of high price, low specific capacity, low energy density, etc.

Active Publication Date: 2020-09-15
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial applications have proven that these materials have high potential and stability, but their specific capacity is low (205mAh / g)
In addition, as the earliest commercial cathode material, lithium cobalt oxide (LiCoO 2 ) The theoretical specific capacity is 273mAh / g, but the actual specific capacity is only about 140mAh / g, and there are also defects of high price and high toxicity; although lithium nickelate (LiNiO 2 ) The specific capacity can reach 150mAh / g, slightly higher than LiCoO 2 , but in LiNiO 2 During the synthesis process, the loss of lithium is prone to occur, and LiNiO that meets the standard chemical composition is synthesized 2 Difficult; with LiCoO 2 Compared with lithium manganese oxide (LiMnO 4 ) is cheap, but the theoretical specific capacity is low (148mAh / g), and the cycle performance is poor; lithium iron phosphate (LiFeO 4 ) The theoretical specific capacity can reach 170mAh / g, but the conductivity is poor and the energy density is low
The theoretical specific capacity of negative electrode graphite is 372mAh / g, and the actual specific capacity reaches 360mAh / g. The positive electrode material limits the specific capacity of lithium-ion batteries

Method used

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  • Vanadium pentoxide-lithium borate-graphene glass positive electrode material and preparation method and application thereof
  • Vanadium pentoxide-lithium borate-graphene glass positive electrode material and preparation method and application thereof
  • Vanadium pentoxide-lithium borate-graphene glass positive electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0026] The present invention provides a V 2 o 5 -LiBO 2 -The preparation method of graphene glass cathode material, comprises the following steps:

[0027] a) V with a mass ratio of 7 to 9:2 to 3 2 o 5 and LiBO 2 Mix evenly, heat up to 700-800°C, keep warm, and quench; keep warm at 180-220°C for 8-10 hours, and ball mill after cooling to obtain a powder with a particle size D50 of less than 10 μm;

[0028] b) mixing the powder and the corrosive agent at a mass ratio of 1:1.8 to 2.3 to form pores, and then ultrasonically mixing with the flake graphene dispersion to obtain a precursor;

[0029] c) In an Ar atmosphere of 0.015-0.025MPa, anneal the precursor at 200-400°C and keep it warm for 6-9h to obtain V 2 o 5 -LiBO 2 - Graphene glass cathode material.

[0030] In the present invention, V with a mass ratio of 7 to 9:2 to 3 2 o 5 and LiBO 2 Mix evenly, heat up to 700-800°C, keep warm, and quench; keep warm at 180-220°C for 8-10 hours, and ball mill after cooling to ...

Embodiment 1

[0047] V with a mass ratio of 8:2 2 o 5 and LiBO 2 Mix evenly, transfer the obtained mixed raw materials to an alumina crucible, melt in a heating furnace, raise the temperature to 800°C at a heating rate of 10°C / min, keep it warm for 30min, pour it into an iron plate under vacuum, and cool it rapidly ( Quenching), heat at 200°C for 9 hours, then cool down to room temperature with the furnace, grind into powder, ball mill for 100min, sieve, particle size D50 is less than 10μm, and vacuum pack;

[0048] Add 10mL of 1mol / L hydrofluoric acid aqueous solution and 5g of the above-mentioned powder into a plastic beaker, mix and make holes under stirring, the stirring speed is 1000rpm, the temperature is 400°C, the time is 100min, and then add 5g with a solid content of 1%. The flake graphene dispersion was ultrasonicated at 40°C for 50min, and then dried at 140°C for 5h to obtain the precursor;

[0049] Put the precursor into a closed tubular heating furnace, pressurize Ar to 0.0...

Embodiment 2

[0052] The same step as in Example 1, except that 8 g of graphene flake dispersion with a solid content of 2% was added.

[0053] image 3 V prepared for Example 2 of the present invention 2 o 5 -LiBO 2 - Scanning electron microscope image of graphene glass cathode material; from image 3 It can be seen that: V 2 o 5 -LiBO 2 -The graphene glass powder is spherical as a whole, and dense small holes appear on the surface to realize the loading of graphene powder.

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Abstract

The invention provides a V2O5-LiBO2-graphene glass positive electrode material and a preparation method and application thereof. The method comprises the following steps: a) uniformly mixing V2O5 andLiBO2, heating, keeping the temperature, and quenching; carrying out heat preservation again, cooling, and carrying out ball milling to obtain powder with the particle size D50 of less than 10mu m; b)mixing the powder with corrosion, forming pores, and ultrasonically mixing with the flake graphene dispersion liquid to obtain a precursor; and c) in an Ar atmosphere, annealing the precursor, and carrying out heat preservation to obtain the glass positive electrode material. According to the preparation method, through introducing flaky graphene into V2O5-LiBO2, using the flaky graphene as a strong conductive agent, using a corrosive agent for corrosion pore forming, and then performing heat treatment and ultrasonic treatment, the V2O5-LiBO2 glass particles are assembled, embedded and filledwith flaky graphene, the defects of vanadium-boron glass used as an electrode of the lithium ion battery are overcome, and the lithium ion battery has the performance advantages of high conductivity,high reversible specific capacity and high battery cycling stability.

Description

technical field [0001] The invention belongs to the technical field of cathode materials, in particular to a V 2 o 5 -LiBO 2 - Graphene glass cathode material and its preparation method and application. Background technique [0002] Due to the advantages of large specific capacity, wide use potential, and high energy density, lithium-ion batteries have developed extremely rapidly, and products have been put into use on a large scale in daily life. Lithium-ion battery cathode materials are mainly cobalt, manganese, nickel, etc. and their composite oxides. Commercial applications have demonstrated that these materials have high potential and stability, but their specific capacity is low (205 mAh / g). In addition, as the earliest commercial cathode material, lithium cobalt oxide (LiCoO 2 ) The theoretical specific capacity is 273mAh / g, but the actual specific capacity is only about 140mAh / g, and there are also defects of high price and high toxicity; although lithium nickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/62H01M10/0525C03C3/14C03C11/00C03C15/00C03C17/22
CPCH01M4/364H01M4/483H01M4/485H01M4/625H01M10/0525C03C3/14C03C11/00C03C15/00C03C17/22C03C2218/111Y02E60/10
Inventor 李长久孔凡厚刘龙阳李铭涵黄柯柯
Owner HAINAN UNIVERSITY
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