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Method for preparing three-dimensional graphene-phosphotungstate

A technology of rubidium phosphotungstate and graphene, which is applied in the field of preparation of lithium-ion battery cathode materials, can solve the problems of poor conductivity of rubidium phosphotungstate, achieve uniform shape, excellent structural stability, and improve discharge specific capacity Effect

Inactive Publication Date: 2016-08-17
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the difficulty of intercalating and deintercalating lithium ions in the microcrystalline structure and non-smooth electron transfer channels, rubidium phosphotungstate has poor conductivity and is almost an insulator.

Method used

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  • Method for preparing three-dimensional graphene-phosphotungstate
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  • Method for preparing three-dimensional graphene-phosphotungstate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Preparation of rubidium phosphotungstate:

[0025] In a 250mL three-neck flask, first add 100mL concentration of 15×10 -4 mol / L aqueous solution of phosphotungstic acid, then slowly add 100mL concentration of 5×10 -2 mol / L aqueous solution of rubidium chloride was heated to 100°C and stirred for 1 hour to form a rubidium phosphotungstic acid emulsion. After the reaction was completed, it was cooled to room temperature and separated by suction filtration to obtain rubidium phosphotungstate.

[0026] 2) Preparation of graphene-coated rubidium phosphotungstate:

[0027] Take 0.25g of rubidium phosphotungstate prepared in step 1) and put it into a polytetrafluoroethylene bottle, then add 10mL of graphene oxide aqueous solution with a concentration of 10mg / mL prepared in advance, and stir the mixed solution for one hour at room temperature, Make it fully react, then put the polytetrafluoroethylene bottle into the hydrothermal reaction kettle, and finally put the hydroth...

Embodiment 2

[0029] 1) Preparation of rubidium phosphotungstate:

[0030] Into a 250mL three-neck flask, first add 100mL concentration of 6×10 -4 mol / L aqueous solution of phosphotungstic acid, then slowly add 100mL concentration of 3×10 -2 mol / L aqueous solution of rubidium chloride was heated to 100°C and stirred for 1 hour to form a rubidium phosphotungstic acid emulsion. After the reaction was completed, it was cooled to room temperature and separated by suction to obtain rubidium phosphotungstate.

[0031] 2) Preparation of polyaniline-coated rubidium phosphotungstate:

[0032] Take 0.25g of rubidium phosphotungstate prepared in step 1) and put it into a polytetrafluoroethylene bottle, then add 10mL of graphene oxide aqueous solution with a concentration of 10mg / mL prepared in advance, and stir the mixed solution for one hour at room temperature, Make it fully react, then put the polytetrafluoroethylene bottle into the hydrothermal reaction kettle, and finally put the hydrothermal r...

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Abstract

The invention discloses a method for preparing three-dimensional graphene-phosphotungstate, and belongs to the technical field of chemical batteries. The method comprises the following steps of: mixing a rubidium chloride solution and a phosphotungstic acid solution to react so as to obtain rubidium phosphowolframate; mixing the rubidium phosphowolframate and a graphene oxide solution, performing hydrothermal reaction, after the reaction is completed, cooling to the room temperature, taking out solid substances, and performing freeze-drying, thereby obtaining three-dimensional graphene-phosphotungstate. The method disclosed by the invention is simple, the prepared rubidium phosphowolframate is relatively small in size, uniform in morphology and beneficial to solve the problem that lithium ions are hard to embed and desorb from microcrystalline structures, and can be applied to cathode materials of lithium batteries, and conductivity of a heteropolyacid molecular cluster battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Rubidium phosphotungstate (Rb 3 PW 12 o 40 ) is a kind of heteropolyacid (polymetallic oxygen cluster), and rubidium 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 commercialized ordinary LiCoO 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 redox process, it is obtained that the heteropolyacid molecules are redischarged from [PW(VI) 12 o 40 ] 3- The state gets 24 electrons a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 刁国旺孙春雨倪鲁彬李斌季卫吴震梁大帅赵钢筋李欢
Owner YANGZHOU UNIV
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