Preparation method of mesoporous lithium vanadium phosphate cathode material

A mesoporous lithium vanadium phosphate, cathode material technology, applied in the direction of phosphate, phosphorus oxyacid, chemical instruments and methods, etc., to achieve high specific capacity, shorten the electron transmission distance, increase the effect of contact area

Active Publication Date: 2018-08-28
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, mesoporous materials can increase the contact area, increase the active sites of electrochemical reactions, and increase the liquid retention capacity, which has become the focus of people's research. At present, mesoporous lithium vanadium phosphate with uniform pores has rarely been reported.

Method used

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  • Preparation method of mesoporous lithium vanadium phosphate cathode material

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[0017] The invention provides a method for preparing a mesoporous lithium vanadium phosphate positive electrode material, comprising the following steps: (1) preparing a mixed solution in proportion with a vanadium source, a phosphorus source, a template agent, and oxalic acid, and drying to obtain a dry mixture; (2) mixing The dry mixture in step (1) is roasted in an inert atmosphere, and then an alkaline solution is added to remove the template, washed and dried to obtain mesoporous vanadium phosphate; (3) the mass ratio of mesoporous vanadium phosphate to lithium source in step (2) is 1: (0.1~5) mixed with deionized water to prepare a solution with a lithium ion concentration of 0.01mol / L~10mol / L. After drying and roasting in an inert atmosphere, remove unreacted lithium elements with deionized water. After drying, Prepared mesoporous lithium vanadium phosphate.

[0018] The method shown in the specific embodiment of the present invention includes: (1) V2O5, oxalic acid, te...

Embodiment 2

[0022] Example 2 V2O5: oxalic acid: template agent (KIT-6 is a kind of mesoporous silica): ammonium monohydrogen phosphate = 1: 2: 2: 4 Add V2O5, oxalic acid, template agent, monohydrogen phosphate ammonium, mixed and stirred for 3 hours, and dried with water at a temperature of 30°C and an air pressure of -95KPa to obtain a mixture. The obtained mixture was calcined at 300°C for 7 hours in a nitrogen atmosphere, and KIT-6 was removed from the obtained product with 30% sodium hydroxide solution at 40°C, washed and dried to obtain mesoporous vanadium phosphate. Add the obtained mesoporous vanadium phosphate and lithium hydroxide into deionized water at a mass ratio of 1:0.5. The concentration of lithium ions in the solution is 0.2mol / L. After mixing and stirring for 1 hour, the temperature is 30°C and the pressure is -95KPa. Dry to obtain the mixture. In an argon protective atmosphere, it was calcined at 400°C for 30 hours, and unreacted lithium elements were removed with deio...

Embodiment 3

[0023] Example 3 Add V2O5, oxalic acid, template agent, and ammonium dihydrogen phosphate at a molar ratio of V2O5: oxalic acid: template (mesoporous carbon): ammonium dihydrogen phosphate = 1: 4.5: 4: 3.2, mix and stir for 4 hours, and the passing temperature is Dry the water at 60°C with an air pressure of -75KPa to obtain a mixture. The obtained mixture was calcined at 500°C for 20 hours in a nitrogen atmosphere, and the mesoporous carbon was removed from the obtained product with 40% barium hydroxide solution at 45°C, washed and dried to obtain mesoporous vanadium phosphate. Add the obtained mesoporous vanadium phosphate and lithium carbonate into deionized water at a mass ratio of 1:0.8. The lithium ion concentration in the solution is 2mol / L. After mixing and stirring for 3 hours, the water is dried at a temperature of 50°C and an air pressure of -75KPa. to get the mixture. In an argon protective atmosphere, it was calcined at 500°C for 20 hours, and unreacted lithium e...

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Abstract

The invention discloses a preparation method of a mesoporous lithium vanadium phosphate cathode material. The method comprises the following steps: (1) preparing a mixed solution from a vanadium source, a phosphorus source, a template agent and oxalic acid according to a ratio, and drying the mixed solution to obtain a dried mixture; (2) calcining the dried mixture obtained in the step (1) under inert atmosphere, then adding an alkaline solution and removing the template agent, washing and drying to obtain mesoporous vanadium phosphate; and (3) mixing mesoporous vanadium phosphate obtained inthe step (2) with a lithium source according to a mass ratio of 1 to (0.1-5), then adding the mixture to deionized water to prepare a solution with a lithium ion concentration of 0.01-10mol/L, duringand calcining under inert atmosphere, then removing unreacted lithium elements by using deionized water, and drying the solution to obtain mesoporous lithium vanadium phosphate. The mesoporous lithiumvanadium phosphate prepared by the method has uniform pores; the contact area between the mesoporous lithium vanadium phosphate and electrolyte is increased; the electron transmission distance is shortened, so that the lithium battery conductivity and the material utilization rate are improved.

Description

technical field [0001] The invention relates to the preparation technology of lithium battery positive electrode materials, in particular to a preparation method of mesoporous lithium vanadium phosphate positive electrode material. Background technique [0002] Due to the advantages of high energy density, no memory effect, long cycle life, small self-discharge and discharge, and fast charge and discharge, lithium-ion batteries are gradually applicable to all aspects of life. Lithium-ion batteries are indispensable in everything from mobile phones to operating buses. With the Internet of Things technology, the field of smart cars will become the next focus of changing human society. However, power batteries, as the core components of smart cars, are also facing various technical challenges, such as how to increase energy density, prolong service life, and reduce charging time. [0003] Among them, the positive electrode material is the key factor of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37
CPCH01M4/5825H01M10/0525C01B25/26C01B25/375C01B25/45Y02E60/10
Inventor 邹朋辉张华磊张洁云
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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