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A method of in-situ coating conductive polymers to improve electrode capacity

A conductive polymer, in-situ coating technology, applied in the field of electrochemistry, can solve problems such as the inability to use electrode materials, and achieve the effects of being beneficial to transmission, the preparation method is simple and easy to operate, and the conductivity is high.

Active Publication Date: 2021-08-17
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 a template and also as 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 1g of powdered lithium cobaltate and 0.05g of acetylene black and ball mill for 2 hours, 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, use metal lithium as the negative electrode, and use 1mol / L lithium hexafluorophosphate ethylene carbonate solution as the electrolyte, assemble it into a lithium ion battery, and charge it 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 the electrode material coated with polypyrrole in situ.

Embodiment 2

[0018] a Mechanically mix 1g of powdered lithium vanadate with 0.125g of acetylene black and ball mill for 20h, then press into tablets, wherein the thickness of the tablets is 0.2cm;

[0019] b Use the sheet pressed in step a as the positive electrode material, use sodium metal as the negative electrode, and use 1mol / L sodium hexafluorophosphate ethylene carbonate solution as the electrolyte, assemble it into a sodium ion battery, and charge it 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 1g of powdered lithium iron phosphate and 0.1g of acetylene black and ball mill 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, use metal lithium as the negative electrode, and use 1mol / L lithium hexafluorophosphate ethylene carbonate solution as the electrolyte, assemble it into a lithium ion battery, and charge it 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 ℃, obtain the electrode material of in-situ coated polythiophene.

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Abstract

The invention relates to a preparation method of an electrode material, in particular to a method for in-situ coating a conductive polymer to increase the capacity of an electrode, and belongs to the technical field of electrochemistry. In the present invention, firstly, the powdery battery material is mechanically mixed with acetylene black and ball-milled, then pressed into tablets, and assembled into a battery as a positive electrode material, charged to 3‑4.2V, and then the charged electrode material is taken out and placed in a conductive Soak in an aqueous solution of polymer monomers and surfactants, take out the soaked electrode material, wash it, and dry it to obtain the electrode material in-situ coated with a conductive polymer, which can be applied to Lithium and sodium ion batteries, 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 in-situ coating a conductive polymer to increase the capacity of an electrode, and belongs to the technical field of electrochemistry. [0002] technical background [0003] 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 research hotspot. Electrochemical energy storage technology is an energy storage method that uses electrochemical reactions to convert chemical energy and electrical energy. Among them, 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. Therefore, higher requir...

Claims

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Application Information

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Patent Type & Authority Patents(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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