Nanoscale lithium vanadyl phosphate positive electrode material and preparation method thereof, lithium ion battery

A technology of lithium vanadyl phosphate and cathode material, applied in nanotechnology, battery electrodes, nanotechnology and other directions, can solve the problems of poor electrical conductivity, large size of lithium vanadyl phosphate, poor electrochemical performance, etc., and achieve excellent electrical conductivity , The effect of inhibiting the growth of crystal nucleus and improving conductivity

Active Publication Date: 2020-07-14
SHENZHEN DYNANONIC
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Problems solved by technology

[0004] The purpose of the present invention is to provide a nano-lithium vanadyl phosphate positive electrode material and its preparation method, aiming to solve the problem of poor electrical conductivity of the existing lithium vanadyl phosphate, large size of lithium vanadyl phosphate, and poor electrochemical performance. question

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  • Nanoscale lithium vanadyl phosphate positive electrode material and preparation method thereof, lithium ion battery

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[0024] The embodiment of the present invention also provides a preparation method of nano-lithium vanadyl phosphate positive electrode material, comprising the following steps:

[0025] S01. Provide a lithium source, a vanadium source, a phosphorus source, and a polyacrylic acid complexing agent, mix them in a solvent, and adjust the pH to 3-6 to obtain a gel mixture;

[0026] S02. Drying the gel-like mixture and crushing it to obtain a lithium vanadyl phosphate precursor;

[0027] S03. Provide carbon nanotubes and dispersants, mix the lithium vanadyl phosphate precursor, carbon nanotubes, and dispersants, grind them, sinter in an inert atmosphere, crush and sieve to obtain nano-lithium vanadyl phosphate positive electrodes Material.

[0028] The preparation method of the nano-lithium vanadyl phosphate positive electrode material provided by the embodiment of the present invention has the following advantages:

[0029] First, under the action of a dispersant, through grindin...

Embodiment 1

[0048] A method for preparing a nanometer lithium vanadyl phosphate positive electrode material, comprising the following steps:

[0049] Weigh 0.8 mol of lithium carbonate, 1 mol of vanadium pentoxide, 0.9 mol of diammonium hydrogen phosphate, and 0.1 mol of hydrolyzed polymaleic anhydride, dissolve them in deionized water, and adjust the pH of the solution to 4 with oxalic acid;

[0050] Stir in a water bath at 70°C for 4h to form a gel-like mixture, then dry at 60°C in an air atmosphere for 12h, and then crush to form a powder to obtain a lithium vanadyl phosphate precursor;

[0051] Weigh 95% of the lithium vanadyl phosphate precursor, mix it with 1% carbon nanotubes, and 0.2% PVP, and stir it under the condition of 800r / min, then sand-mill to D50=1um; Dry at 100°C to obtain a composite material of CNT / lithium vanadyl phosphate;

[0052] The dried composite material was sintered at 800°C for 4 hours, then crushed and sieved to obtain the finished product.

Embodiment 2

[0054] A method for preparing a nanometer lithium vanadyl phosphate positive electrode material, comprising the following steps:

[0055] Weigh 0.9 mol of lithium nitrate, 1.2 mol of vanadium pentoxide, 1 mol of diammonium hydrogen phosphate, and 0.15 mol of polyacrylic acid, dissolve them in deionized water, adjust the pH of the solution to 5 with citric acid; stir in a water bath at 80°C for 6 hours until The sol was then dried at 60°C for 12 hours in an air atmosphere, and then crushed to form a powder to obtain a lithium vanadyl phosphate precursor;

[0056] Weigh 96.3% lithium vanadyl phosphate precursor, mix with 1.5% carbon nanotubes, 0.4% PVP, and stir under the condition of 1000r / min, then sand mill to D50=1um; put the grinding liquid under the protection environment of nitrogen Dry at 100°C to obtain a composite material of CNT / lithium vanadyl phosphate;

[0057] The dried composite material was sintered at 650°C for 6 hours, then crushed and sieved to obtain the fi...

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Abstract

The invention provides a nanometer lithium vanadium phosphate positive electrode material. The nanometer lithium vanadium phosphate positive electrode material comprises a carbon nanotube and nanometer lithium vanadium phosphate, wherein the grain of the nanometer lithium vanadium phosphate is 40-200 nanometers, and the mass ratio of the carbon nanotube and the nanometer lithium vanadium phosphateis (0.2-1):(99-99.8). The invention also provides a preparation method of the nanometer lithium vanadium phosphate positive electrode material. The preparation method comprises the following steps ofproviding a lithium source, a vanadium source, a phosphate source and a polyacrylic acid complexing agent, performing uniform mixing in a solvent, and adjusting pH to 3-6 to obtain a gel mixture; drying and crushing the gel mixture to obtain a lithium vanadium phosphate precursor; and providing the carbon nanotube and a dispersing agent, mixing and grinding the lithium vanadium phosphate precursor, the carbon nanotube and the dispersing agent, performing sintering in an inert atmosphere, and performing crushing and sieving to obtain the nanometer lithium vanadium phosphate positive electrodematerial.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a nanometer lithium vanadyl phosphate cathode material and a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium vanadyl phosphate is a new type of lithium-ion battery cathode material, which belongs to the phosphate polyanion cathode material. 4+ / V 5+ Based on the redox couple, it has a higher charge-discharge platform (3.95Vvs Li + ) and high theoretical specific capacity (159mAh / g), the energy density is also higher than the commercialized lithium iron phosphate cathode material, which is a good candidate material for a new generation of lithium-ion power batteries, and my country is rich in vanadium resources, so Considering production cost and raw material price, lithium vanadyl phosphate cathode battery material has irreplaceable advantages. [0003] At present, lithium vanadyl phosphate i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽方东升李洁凤
Owner SHENZHEN DYNANONIC
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