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Method for improving electrode capacity through in-situ coated conductive macromolecule

A conductive polymer and in-situ coating technology, which is applied in the field of electrochemistry, can solve the problems that electrode materials cannot be used, and achieve the effects of favorable transmission, high conductivity, cycle stability and rate performance improvement

Active Publication Date: 2018-08-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, manganese dioxide is used as both a template and an initiator (oxidant) for the synthesis of polyaniline, but this method cannot be applied to most electrode materials coated with conductive polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] a Mechanically mix and ball mill 1g of powdered lithium cobaltate and 0.05g of acetylene black for 2h, and then press into tablets, wherein the thickness of the tablets is 0.1cm;

[0015] B use the sheet pressed in step a as the positive electrode material, take metal lithium as the negative electrode, and use the ethylene carbonate solution of lithium hexafluorophosphate of 1mol / L as the electrolyte, assemble into a lithium-ion battery, and charge to 3V;

[0016] c Disassemble the battery charged to 3V through step b, take out 1g of the electrode material prepared in step b, and place it in 10g of an aqueous solution containing 0.01mol of pyroxene monomer and 0.001mol of sodium lauryl sulfate After soaking for 1 hour, take it out and dry it at 60°C to obtain an electrode material coated with polypyrrole in situ.

Embodiment 2

[0018] a 1g powdery lithium vanadate is mechanically mixed with 0.125g carbon and ball milled for 20h, and then pressed into tablets, wherein the thickness of the sheet is 0.2cm;

[0019] B with the pressed sheet in step a as positive electrode material, with metal sodium as negative electrode, with the ethylene carbonate solution of sodium hexafluorophosphate of 1mol / L as electrolyte, assemble into sodium ion battery, charge to 4.2V;

[0020] c Disassemble the battery charged to 4.2V through step b, take out 1g of the electrode material prepared in step b, and place it in 100g of an aniline monomer containing 0.5mol and 0.05mol of sodium dodecylbenzenesulfonate Soak in an aqueous solution for 24 hours, then take it out and dry it at 120°C to obtain an electrode material coated with polyaniline in situ.

Embodiment 3

[0022] a Mechanically mix and ball mill 1g of powdered lithium iron phosphate with 0.1g of carbon for 10h, then press into tablets, wherein the thickness of the tablets is 0.15cm;

[0023] B use the sheet pressed in step a as the positive electrode material, take metal lithium as the negative electrode, and use the ethylene carbonate solution of lithium hexafluorophosphate of 1mol / L as the electrolyte, assemble into a lithium-ion battery, and charge to 4V;

[0024] c Disassemble the battery charged to 4V through step b, take out 1g of the electrode material prepared in step b, and place it in 50g of thiophene monomer containing 0.1mol and 0.01mol of cetyltrimethylammonium bromide Soak in the aqueous solution of 10h, then take out and dry at 80 ℃, the electrode material of in-situ coated polythiophene is obtained.

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Abstract

The invention relates to a preparation method of an electrode material, and specifically relates to a method for improving electrode capacity through in-situ coated conductive macromolecule, and belongs to the technical field of the electrochemistry. The method comprises the following steps: mechanically mixing and ball-milling the powdery battery material and the carbon at first, and then tableting the mixed material which is used as a positive electrode material to be assembled into the battery, charging the positive electrode material to 3-4.2V, and then taking out the charged electrode material and placing in the water solution containing the conductive macromolecule monomer and the surfactant to soak, taking out the soaked electrode to clean, and drying to obtain the electrode material with the in-situ coated conductive macromolecule. The electrode material can be applied to the lithium and sodium ion battery, and the battery capacity is greatly improved, and the preparation method is simple and easy to operate.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a method for increasing the capacity of an electrode by coating a conductive polymer in situ, and belongs to the field of electrochemical technology. technical background [0002] With the increasingly serious energy and environmental problems, the research on high-efficiency, low-cost and environment-friendly renewable energy conversion and storage systems has become a scientific research hotspot. Electrochemical energy storage technology is an energy storage method that uses electrochemical reactions to convert chemical energy and electrical energy, among which batteries are the cutting-edge technology of various high-performance energy storage devices. Lithium-sulfur, lithium-tin, lithium and sodium-ion batteries are widely used at present. The performance of the electrode material is the main factor affecting the performance of the battery, so the charge and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/42
CPCH01M4/366H01M10/42Y02E60/10
Inventor 方东鲍瑞易健宏李秀娟
Owner KUNMING UNIV OF SCI & TECH
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