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Iron phosphate/conducting polymer composite cathode material for lithium ion battery and preparation method of composite cathode material

A technology of composite cathode materials and conductive polymers, which can be applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limitation, low electron conductivity, lithium ion migration rate, etc., and achieve easy operation, simple preparation method, and excellent electrochemical performance. performance effect

Inactive Publication Date: 2015-02-18
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Iron phosphate is environmentally friendly, has a wide range of raw material sources, and is low in price. However, due to its inherently low electronic conductivity and lithium ion migration rate, the promotion and application of this material in lithium ion battery cathode materials is limited.

Method used

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  • Iron phosphate/conducting polymer composite cathode material for lithium ion battery and preparation method of composite cathode material
  • Iron phosphate/conducting polymer composite cathode material for lithium ion battery and preparation method of composite cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Configure a 0.1M ferric nitrate solution and an equimolar concentration of 0.1M diammonium hydrogen phosphate solution; the syringe draws 100 mL of the same volume of ferric nitrate solution and ammonium dihydrogen phosphate solution, and the two solutions are fed at 100 mL / min through a precision syringe pump. The flow rate is injected into the Y-type microchannel mixer, the two liquids are in contact with each other at an angle of 60 degrees and mixed, reacting to produce nano-iron phosphate precipitate. The precipitate is centrifuged, washed several times, and dried in a blast drying oven for 6 hours to obtain a dry Nanometer iron phosphate precipitation: Put the dried nanometer iron phosphate precipitate into a muffle furnace and calcinate at 350 degrees Celsius to obtain nanometer iron phosphate without crystal water. A layer of conductive polymer polythiophene is uniformly coated on the surface of the crystallized water nano-iron phosphate by gas phase polymerizatio...

Embodiment 2

[0025] Configure a 0.1M ferric nitrate solution and an equimolar concentration of 0.1M diammonium hydrogen phosphate solution; the syringe draws 100 mL of the same volume of ferric nitrate solution and ammonium dihydrogen phosphate solution, and the two solutions are fed at 100 mL / min through a precision syringe pump. The flow rate is injected into the Y-type microchannel mixer, the two liquids are in contact with each other at an angle of 60 degrees and mixed, reacting to produce nano-iron phosphate precipitate. The precipitate is centrifuged, washed several times, and dried in a blast drying oven for 6 hours to obtain a dry Nanometer iron phosphate precipitation: Put the dried nanometer iron phosphate precipitate into a muffle furnace and calcinate at 350 degrees Celsius to obtain nanometer iron phosphate without crystal water. A layer of conductive polymer polythiophene is uniformly coated on the surface of the crystallized water nano iron phosphate by gas phase polymerizatio...

Embodiment 3

[0027] Configure a 0.1M ferric nitrate solution and an equimolar concentration of 0.1M diammonium hydrogen phosphate solution; the syringe draws 100 mL of the same volume of ferric nitrate solution and ammonium dihydrogen phosphate solution, and the two solutions are fed at 100 mL / min through a precision syringe pump. The flow rate is injected into the Y-type microchannel mixer, the two liquids are in contact with each other at an angle of 60 degrees and mixed, reacting to produce nano-iron phosphate precipitate. The precipitate is centrifuged, washed several times, and dried in a blast drying oven for 6 hours to obtain a dry Nanometer iron phosphate precipitation: Put the dried nanometer iron phosphate precipitate into a muffle furnace and calcinate at 350 degrees Celsius to obtain nanometer iron phosphate without crystal water. A layer of conductive polymer polythiophene is uniformly coated on the surface of the crystallized water nano-iron phosphate by gas phase polymerizatio...

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Abstract

The invention relates to a preparation method for an iron phosphate / conducting polymer composite cathode material for a lithium ion battery. The preparation method comprises the following steps: respectively extracting equal volumes of ferric nitrate solution, ammonium dihydrogen phosphate solution or phosphoric acid solution, injecting two streams of solution through a precision injection pump into a Y-type microchannel mixer for reaction to generate nano iron phosphate precipitate, centrifuging, cleaning, drying, calcining, and adopting gaseous polymerization to enable the surface of the nano iron phosphate from which crystal water is removed to be coated with a layer of conducting polymer polythiophene. Through adopting high flow rate condition, two outlets of the Y-type microchannel mixer are arranged at 60 degrees, reactant fluids are mixed and reacted to prepare the nano iron phosphate, and does not block the microchannel. The core-shell structure cathode material prepared in the invention has a quite excellent electrochemical performance, and is simple in preparation method and easy to operate.

Description

Technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a conductive polymer coated lithium ion battery positive electrode material iron phosphate and a preparation method thereof. Background technique [0002] Iron Phosphate (FePO 4 ) Is also called iron orthophosphate. The iron in iron phosphate is trivalent, mostly dihydrate compounds; iron phosphate compounds are widely used, such as: steel, ceramic glass and nutritional supplements (iron fortifiers), manufacturing lithium iron phosphate cathodes Materials and catalysts. Because iron phosphate has a rich framework structure, research is mainly focused on the synthesis of microporous iron phosphate materials with open framework structure, and organic compounding of iron phosphate to improve its performance in the fields of catalysis, lithium ion batteries and biological materials. With the deepening of the research of iron phosphate, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362H01M4/5825Y02E60/10
Inventor 何丹农严鹏吴晓燕杨扬王丹张春明
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH