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A kind of preparation method of carbon-coated potassium phosphotungstate microcube composite material

A technology of carbon-coated potassium phosphotungstate and potassium phosphotungstate, applied in positive electrodes, active material electrodes, structural parts, etc., can solve problems affecting the application of potassium phosphotungstate and poor conductivity of potassium phosphotungstate and other problems, to achieve good cycle reversibility and stability, multiple lithium insertion sites, and solve the effects of difficult insertion and extraction.

Active Publication Date: 2019-06-14
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, limited by the difficulty of intercalation and extraction of lithium ions in the microcrystalline structure and non-smooth electron transfer channels, the poor conductivity of potassium phosphotungstate directly affects the application of potassium phosphotungstate in lithium-ion batteries.

Method used

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  • A kind of preparation method of carbon-coated potassium phosphotungstate microcube composite material
  • A kind of preparation method of carbon-coated potassium phosphotungstate microcube composite material
  • A kind of preparation method of carbon-coated potassium phosphotungstate microcube composite material

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Embodiment 1

[0030] 1) Preparation of potassium phosphotungstate microcubes:

[0031] Take 800mg of phosphotungstic acid in a 150ml beaker, add 120mL of water and ultrasonically dissolve it evenly, and obtain a concentration of 2.3×10 -3 mol / L aqueous solution of phosphotungstic acid. Take 600mg of potassium chloride in a 150mL beaker, add 120mL of water and ultrasonically dissolve it evenly, and obtain a concentration of 6.7×10 -2 mol / L aqueous potassium chloride solution. Put the phosphotungstic acid aqueous solution into a 500mL three-hole flask, heat it to 100°C under an oil bath, then add the prepared potassium chloride aqueous solution into the above-mentioned phosphotungstic acid aqueous solution at 100°C, and stir at 100°C React for 1 hour to form potassium phosphotungstate microcubic emulsion. After the reaction, cool to room temperature, centrifuge, take the solid phase, wash and separate, and dry to obtain potassium phosphotungstate microcubes.

[0032] 2) Preparation of carb...

Embodiment 2

[0036] 1) Preparation of potassium phosphotungstate microcubes:

[0037] Take 800mg of phosphotungstic acid in a 150ml beaker, add 120mL of water and ultrasonically dissolve it evenly, and obtain a concentration of 2.3×10 -3 mol / L aqueous solution of phosphotungstic acid. Take 600mg of potassium chloride in a 150mL beaker, add 120mL of water and ultrasonically dissolve it evenly, and obtain a concentration of 6.7×10 -2mol / L aqueous potassium chloride solution. Put the phosphotungstic acid aqueous solution into a 500mL three-hole flask, heat it to 100°C under an oil bath, then add the prepared potassium chloride aqueous solution into the above-mentioned phosphotungstic acid aqueous solution at 100°C, and stir at 100°C After 1 hour, a potassium phosphotungstate microcubic emulsion is formed. After the reaction, cool to room temperature, centrifuge, collect the solid phase for washing and separation, and dry to obtain potassium phosphotungstate microcubes.

[0038] 2) Preparat...

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Abstract

A method for preparing a carbon-coated potassium phosphotungstate microcube composite material, belonging to the technical field of chemical batteries, first preparing potassium phosphotungstate microcubes, and then dispersing the potassium phosphotungstate microcubes in ethanol and deionized water Add ammonia water, tetraethyl orthosilicate, resorcinol and formaldehyde to the mixed solution, stir the reaction until the end, wash and dry, and calcinate the dried solid powder under the protection of nitrogen; then the calcined solid powder Etch in HF acid to remove silicon dioxide, centrifuge to take the solid phase and dry it to obtain carbon-coated potassium phosphotungstate microcubic composite material. Through a simple preparation method and simple operation, the prepared potassium phosphotungstate microcube has a small size and a uniform shape, which is beneficial to solve the problem of difficult intercalation and deintercalation of lithium ions in the microcrystalline structure. The composite material obtained by wrapping carbon on the potassium phosphotungstate microcube has high electrical conductivity, good cycle reversibility and stability in electrochemistry, and high discharge specific capacity.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and in particular relates to a preparation method for a carbon-coated potassium phosphotungstate microcubic composite material as a positive electrode material of a lithium ion battery. Background technique [0002] Potassium phosphotungstate (K 3 PW 12 o 40 ) is a kind of heteropolyacid (polymetallic oxygen cluster). Potassium phosphotungstate is a well-studied positive electrode active material in heteropolyacid molecular clusters. Due to its reversible multi-electron redox reaction, it has the ability to reach 260Ah / kg high specific capacity (its capacity exceeds that of the commercialized common Li 2 CoO 2 150Ah / kg of lithium-ion battery) and excellent performance of fast charge and discharge. Through the XAFS (ray absorption fine structure) ray wave study of the electron transfer changes of heteropolyacids in the oxidation-reduction process, it is obtained that the heteropol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 倪鲁彬杨光赵钢筋牛国盛李欢赵红霞梁大帅
Owner YANGZHOU UNIV
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