High-rate lithium vanadium phosphate positive electrode material, and preparation method and application thereof

A technology of lithium vanadium phosphate and cathode material, applied in the field of electrochemistry, can solve the problems of low ion diffusion coefficient, limitation, poor conductivity of lithium vanadium phosphate, etc., and achieve the effects of improving cycle performance, preventing agglomeration, and improving rate performance.

Active Publication Date: 2016-03-16
MAANSHAN YUCHI NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is mainly to overcome the shortcomings of the poor self-conductivity and low ion diffusion coefficient of lithium vanadium phosphate obtained by the existing s

Method used

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  • High-rate lithium vanadium phosphate positive electrode material, and preparation method and application thereof
  • High-rate lithium vanadium phosphate positive electrode material, and preparation method and application thereof
  • High-rate lithium vanadium phosphate positive electrode material, and preparation method and application thereof

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Embodiment 1

[0041] A method for preparing a high-rate lithium vanadium phosphate positive electrode material in this embodiment is prepared by using a solvothermal method at high temperature and high pressure, and the specific steps are as follows:

[0042] (1) First accurately weigh 400mg (1.5mmol) of tributyl phosphate, 153mg (1.5mmol) of lithium acetate dihydrate, and 348mg (1mmol) of vanadium acetylacetonate into 40mL of absolute ethanol solvent, and then add 1.0mL of oil Acid, ultrasonically dissolved for 20 minutes and then put into the autoclave, at a temperature of 400°C (control the heating rate at 2°C min -1 ), the reaction was carried out for 1 h under a pressure of 6 MPa to obtain the precursor of lithium vanadium phosphate positive electrode material.

[0043] (2) After taking out the precursor of the above-mentioned lithium vanadium phosphate positive electrode material, adopting a volume fraction of 95% ethanol to carry out centrifugal cleaning for 3 times (during centrifug...

Embodiment 2

[0049] The preparation method of a kind of high-rate lithium vanadium phosphate cathode material of the present embodiment, its specific steps are:

[0050] (1) First weigh 400mg (1.5mmol) of tributyl phosphate, 153mg (1.5mmol) of lithium acetate dihydrate, and 348mg (1mmol) of vanadium acetylacetonate into 40mL of absolute ethanol solvent, and then add 2.0mL of oleic acid , ultrasonically dissolved for 20 minutes and then placed in a high-pressure reactor, at a temperature of 500°C (controlling the heating rate at 2°C min -1 ), under the pressure of 2MPa, the reaction was carried out for 0.5h to obtain the precursor of lithium vanadium phosphate cathode material.

[0051] (2) After taking out the precursor of the above-mentioned lithium vanadium phosphate positive electrode material, adopting a volume fraction of 95% ethanol to carry out centrifugal cleaning for 3 times (during centrifugation, the rotating speed is 7000rpmmin -1 , the time is 10 min), and then put it into a ...

Embodiment 3

[0055] The preparation method of a kind of high-rate lithium vanadium phosphate cathode material of the present embodiment, its specific steps are:

[0056](1) First weigh 400mg (1.5mmol) of tributyl phosphate, 153mg (1.5mmol) of lithium acetate dihydrate, and 348mg (1mmol) of vanadium acetylacetonate into 40mL of absolute ethanol solvent, and then add 0.2mL of oleic acid , ultrasonically dissolved for 20 minutes and then placed in a high-pressure reactor, at a temperature of 250°C (controlled heating rate: 2°C min -1 ), the reaction was carried out for 5 h under a pressure of 10 MPa to obtain the precursor of lithium vanadium phosphate cathode material.

[0057] (2) After taking out the precursor of the above-mentioned lithium vanadium phosphate positive electrode material, adopting a volume fraction of 95% ethanol to carry out centrifugal cleaning for 3 times (during centrifugation, the rotating speed is 7000rpmmin -1 , the time is 10 min), and then put it into a vacuum ove...

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Abstract

The invention discloses a high-rate lithium vanadium phosphate positive electrode material, and a preparation method and application thereof, belonging to the technical field of electrochemistry. The lithium vanadium phosphate positive electrode material is a lithium vanadium phosphate/carbon composite positive electrode material composed of a great number of caterpillar-like hierarchical structures. The preparation method for the lithium vanadium phosphate positive electrode material comprises the following steps: adding a lithium source, a vanadium source, a phosphorus source and oleic acid into absolute ethyl alcohol; carrying out ultrasonic dissolving and then placing the substances into a high pressure reaction vessel for a complete reaction so as to obtain a precursor; successively subjecting the precursor to centrifugal cleaning and vacuum drying; and then calcining the precursor in a mixed atmosphere of argon and hydrogen so as to obtain the caterpillar-like lithium vanadium phosphate/carbon composite positive electrode material. When used as a lithium ion battery positive electrode material, the lithium vanadium phosphate/carbon composite positive electrode material has high specific capacity, good cycle stability and excellent rate capability and can meet the requirement of a power battery for high performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically relates to a high-rate lithium vanadium phosphate cathode material and a preparation method and application thereof. Background technique [0002] The social status quo such as global warming, fossil energy shortage, and environmental pollution all require us to make full use of renewable resources (wind energy, tidal energy, solar energy, etc.) Harmful resource industry development, to achieve the harmonious development of man and the environment. It is imperative to use clean energy electric vehicles to replace the original high-pollution fuel-powered vehicles. The increasing popularity of electric vehicles (EV) and hybrid electric vehicles (HV) and portable electronic devices are The performance of energy storage equipment puts forward higher requirements. The power batteries currently used mainly include lead-acid batteries, nickel-metal hydride batteries, nick...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/583H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 芮先宏成城
Owner MAANSHAN YUCHI NEW ENERGY MATERIALS CO LTD
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