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Preparation method for flexible positive pole of lithium selenium battery

A battery and flexible technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the inability to effectively improve the shuttle effect of polyselenide in lithium-selenium batteries, and achieve easy implementation, mass production, and simple preparation methods. , the effect of improving utilization

Inactive Publication Date: 2015-09-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, flexible electrodes cannot effectively improve the multi-selenide shuttle effect of lithium-selenium batteries. How to further improve the defects and problems of lithium-selenium batteries on this basis is a question worth thinking about.

Method used

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  • Preparation method for flexible positive pole of lithium selenium battery
  • Preparation method for flexible positive pole of lithium selenium battery
  • Preparation method for flexible positive pole of lithium selenium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 0.18g of multi-walled carbon nanotubes (10nm in diameter and 200nm in length) and 0.02g of sodium alginate were thoroughly ground in a mortar, then an appropriate amount of ultrapure water was added for wet grinding, and then the slurry was mixed with a spatula Coated on the fixed diaphragm, dried in vacuum for 12 hours and then cut into appropriate size for later use.

[0036] Prepare a mixed solution of 50 mL of concentrated nitric acid and 150 mL of concentrated sulfuric acid, add 1 g of hollow carbon fibers (40 nm in diameter and 10 μm in length) into the solution, stir magnetically for 5 hours, filter the product and wash three times with deionized water and ethanol respectively to obtain Activated hollow carbon fibers. Take 0.6 g of the activated hollow carbon fiber and 0.4 g of selenium powder, and after fully grinding, heat the sample at 260° C. without air for 12 hours to obtain a hollow carbon fiber and selenium composite material.

[0037] Take 75 mg of holl...

Embodiment 2

[0046] 0.18g of multi-walled carbon nanotubes (10nm in diameter and 200nm in length) and 0.02g of sodium alginate were thoroughly ground in a mortar, then an appropriate amount of ultrapure water was added for wet grinding, and then the slurry was mixed with a spatula Coated on the fixed diaphragm, dried in vacuum for 12 hours and then cut into appropriate size for later use.

[0047] Prepare a mixed solution of 50 mL of concentrated nitric acid and 150 mL of concentrated sulfuric acid, add 1 g of hollow carbon fibers (40 nm in diameter and 10 μm in length) into the solution, stir magnetically for 5 hours, filter the product and wash three times with deionized water and ethanol respectively to obtain Activated hollow carbon fibers. Take 0.6 g of activated hollow carbon fiber and 0.4 g of selenium powder, and after fully grinding, heat the sample at 260° C. without air for 12 hours to obtain hollow carbon fiber and selenium composite material.

[0048] Take 100 mg of hollow ca...

Embodiment 3

[0051] 0.18g of multi-walled carbon nanotubes (10nm in diameter and 200nm in length) and 0.02g of sodium alginate were thoroughly ground in a mortar, then an appropriate amount of ultrapure water was added for wet grinding, and then the slurry was mixed with a spatula Coated on the fixed diaphragm, dried in vacuum for 12 hours and then cut into appropriate size for later use.

[0052] Prepare a mixed solution of 50 mL of concentrated nitric acid and 150 mL of concentrated sulfuric acid, add 1 g of hollow carbon fibers (40 nm in diameter and 10 μm in length) into the solution, stir magnetically for 5 hours, filter the product and wash three times with deionized water and ethanol respectively to obtain Activated hollow carbon fibers. Take 0.5 g of activated hollow carbon fiber and 0.5 g of selenium powder, and after fully grinding, heat the sample at 260° C. without air for 12 hours to obtain hollow carbon fiber and selenium composite material.

[0053] Take 60 mg of hollow car...

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Abstract

The invention discloses a preparation method for a flexible positive pole of a lithium selenium battery. The preparation method comprises the steps that one side of a membrane is coated with a multi-walled carbon nanotube polyselenide adsorption layer; then a hollow carbon fiber and element-selenium compound material is subjected to vacuum filtration, and a membrane of a multi-walled carbon nanotube is coated with the hollow carbon fiber and element-selenium compound material, so that an active material layer is formed, and the flexible positive pole of the lithium selenium battery is obtained. The preparation method is simple in operation and low in cost, the flexible positive pole of the lithium selenium battery obtained through the method has good mechanical property and electrical property, and is high in selenium loading capacity and active material utilization rate, the cycling stability and the rate capacity of the lithium selenium battery are greatly improved, and the preparation method has high application potential and commercial value.

Description

technical field [0001] The invention relates to a preparation method for a flexible positive electrode of a lithium-selenium battery, belonging to the field of lithium-selenium batteries. Background technique [0002] With the continuous development of portable electronic products, electric vehicles, aerospace and military fields, batteries with high energy density are more and more urgently needed. Among emerging high energy density batteries, the theoretical volumetric energy density of lithium-sulfur batteries is 3467mA h / cm 3 , is considered to be a promising battery system, but how to inhibit the dissolution of polysulfide ions and avoid the generation of lithium dendrites during charge and discharge has been restricting the development and use of lithium-sulfur batteries. Selenium is a congener element of sulfur, which has similar properties to sulfur (3253mA h / cm 3 ) volume specific capacity and better electronic conductivity and electrochemical activity than sulfur...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/1397H01M4/58H01M4/583H01M10/36
CPCH01M4/1393H01M4/1397H01M4/58H01M4/583H01M10/36Y02E60/10
Inventor 张治安王冠超杨富华赖延清
Owner CENT SOUTH UNIV
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