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Preparation method of carbon-coated potassium phosphotungstate microcubic composite

A carbon-coated potassium phosphotungstate and potassium phosphotungstate technology, which can be applied to active material electrodes, electrical components, electrochemical generators, etc. Salt application and other issues, to achieve uniform morphology, good cycle reversibility and stability, and high conductivity.

Active Publication Date: 2017-07-07
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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  • Preparation method of carbon-coated potassium phosphotungstate microcubic composite
  • Preparation method of carbon-coated potassium phosphotungstate microcubic composite
  • Preparation method of carbon-coated potassium phosphotungstate microcubic composite

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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 preparation method of a carbon-coated potassium phosphotungstate microcubic composite belongs to the technical field of chemical batteries. The preparation method comprises: firstly preparing potassium phosphotungstate microcubes, then dispersing the potassium phosphotungstate microcubes in a mixed solution of ethanol and deionized water; adding ammonia water, tetraethyl orthosilicate, resorcinol and formaldehyde, carrying out a stirring reaction, and after the reaction is finished, washing and drying, and roasting the dried solid powder under nitrogen protection; next, etching the roasted solid powder in HF acid to remove silicon dioxide; and centrifuging and drying the solid phase to obtain the carbon-coated potassium phosphotungstate microcubic composite. The potassium phosphotungstate microcubes prepared by the simple preparation method and simple and convenient operations are small in size and uniform in morphology, thereby being conducive to solving the problem of difficult insertion and extraction of lithium ions in and from a microcrystalline structure. The potassium phosphotungstate microcubes is coated with carbon to obtain the composite which has high electrical conductivity and has good cyclic reversibility and stability and high specific discharge capacity in electrochemistry.

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 Applications(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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