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A method for in situ reduction of coated metals to improve electrode capacity

A coating and metal technology, applied in the field of electrochemistry, to achieve the effect of wide material sources, high safety, and increased capacity

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

However, this method requires the addition of a reducing agent to reduce metal ions to obtain metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] a. Mechanically mix 1g of powdered lithium titanate with 0.05g of acetylene black and ball mill for 2 hours, and then press into tablets, wherein the thickness of the tablets is 0.01cm;

[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 discharge it to 1.5V;

[0016] c Disassemble the battery discharged to 1.5V in step b, take out 1g of the electrode material prepared in step b, disperse it in 10g of 0.01mol / L soluble titanium salt solution, soak it for 1h, and then take it out at 60°C Under drying, the in-situ reduction-coated titanium electrode material can be obtained.

Embodiment 2

[0018] a Mechanically mix 1g of powdered sulfur with 0.125g of acetylene black and ball mill for 20h, then press into tablets, wherein the thickness of the tablets is 0.5cm;

[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 discharge it to 0.001V;

[0020] c Disassemble the battery discharged to 0.001V in step b, take out 1g of the electrode material prepared in step b, disperse and soak it in 100g of soluble manganese salt solution of saturated concentration for 24h, and then take it out at 120°C After drying, the in-situ reduction-coated manganese electrode material can be obtained.

Embodiment 3

[0022] a Mechanically mix 1g of powdered selenium with 0.1g of acetylene black and ball mill for 10h, then press into tablets, wherein the thickness of the tablets is 0.1cm;

[0023] b. Use the sheet pressed in step a as the positive electrode material, use metallic 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 discharge it to 0.01V;

[0024] c Disassemble the battery discharged to 0.01V after step b, take out 1g of the electrode material prepared in step b, disperse it in 50g of 0.01mol / L soluble nickel salt solution, soak it for 12h, and then take it out at 80°C The electrode material coated with nickel can be reduced in situ.

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Abstract

The invention relates to a preparation method of an electrode material, in particular to a method for in-situ reduction of a coated metal to increase the capacity of an electrode, and belongs to the technical field of electrochemistry. In the present invention, firstly, the powdered 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, discharged to 1.5‑0.001V, and then the discharged electrode material is taken out and placed in a soluble Disperse and soak in the metal salt solution, and then take out the electrode material soaked in the soluble metal salt solution, wash it, and dry it to obtain the above-mentioned electrode material for in-situ reduction of coated metal, which can be applied to lithium, The electrode of the 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 in-situ reduction of a coated metal 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 require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/04H01M10/0525H01M10/054
CPCH01M4/0438H01M4/366H01M10/0525H01M10/054Y02E60/10
Inventor 方东鲍瑞易健宏李秀娟
Owner KUNMING UNIV OF SCI & TECH
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