Flexible electrode film and preparation method and application thereof

A flexible electrode and film technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as poor cycle stability, low capacity utilization efficiency of positive electrode materials, and low electronic conductivity, so as to reduce reaction polarization, Inhibit the shuttle effect and improve the effect of liquid absorption

Active Publication Date: 2019-08-06
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low electronic conductivity of elemental sulfur and its discharge products, and the shuttling side reactions of soluble polysulfide products lead to low capacity utilization efficiency of cathode materials, poor cycle stability, and limited power performance, which severely restricts the development of lithium-sulfur battery technology.
At the same time, the low conductivity and low density characteristics of elemental sulfur make it difficult to effectively improve the active load mass of the positive electrode, which limits the energy and power performance of the battery.

Method used

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  • Flexible electrode film and preparation method and application thereof
  • Flexible electrode film and preparation method and application thereof
  • Flexible electrode film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Step 1: The specific surface area of ​​elemental sulfur and BET is 400m 2 / g of fluorinated carbon black is mechanically mixed according to a mass ratio of 1:0.3, then added to a ball mill, and dry ball milled for 0.5h, then the above materials are kept in an argon atmosphere at a temperature of 155°C for 24h, and the argon environment is cooled to room temperature. Then, the above materials are ground and refined, and passed through a 300-mesh sieve to obtain a carbon fluoride-loaded sulfur composite material;

[0060] Step 2: Grind and mix the carbon fluoride-supported sulfur composite material and carbon nanotubes with a diameter of less than 5nm at a mass ratio of 8:1 for more than 30 minutes, and then use the carbon fluoride-supported sulfur composite material: carbon nanotubes: polytetrafluoroethylene The mass ratio of the mixture is 8:1:1, adding 15% by mass of polytetrafluoroethylene emulsion, grinding and stirring into a snow flake mixture;

[0061] Step 3: Ad...

Embodiment 2

[0066] Step 1: Make the specific surface area of ​​elemental sulfur and BET 300m 2 / g of porous fluorinated graphene is mechanically mixed according to the mass ratio of 1:0.2, then added to the ball mill, dry ball milled for 1.0h, and then the above materials are kept in an argon atmosphere at a temperature of 155°C for 12h, and the argon environment is cooled to room temperature , and then grind and refine the above-mentioned materials and pass through a 300-mesh sieve to obtain a carbon fluoride-loaded sulfur composite material;

[0067] Step 2: Grind and mix the carbon fluoride-supported sulfur composite material and carbon nanotubes with a diameter of less than 5nm at a mass ratio of 8:1 for more than 30 minutes, and then use the carbon fluoride-supported sulfur composite material: carbon nanotubes: polytetrafluoroethylene The mass ratio of the mixture is 8:1:1, adding 15% by mass of polytetrafluoroethylene emulsion, grinding and stirring into a snow flake mixture;

[00...

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Abstract

The invention discloses a flexible electrode film and a preparation method and an application thereof. The film comprises a carbon fluoride supported sulfur composite material, carbon nanotubes and abinder. The mass ratio of the carbon fluoride supported sulfur composite material to the carbon nanotubes to the binder is (5-12): (0.8-1.2): (0.8-1.2). After hot pressing of the film, a self-supporting flexible cathode is obtained. A preparation method combining atmospheric-pressure low-temperature drying and high-temperature short-time hot pressing is adopted, which can cause secondary melting expansion of sulfur, reduce the resistance of the electrode and achieve the effects of film formation, flexibility improvement and reduction in sulfur loss of active components. The electrode has a compact structure, excellent flexibility and good conductivity.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a flexible electrode film and its preparation method and application. Background technique [0002] With the development of social economy, people have higher and higher performance requirements for mobile power supplies, and various portable electronic product supporting power supplies are developing in the direction of high specific energy, high power, long life, high safety, and high environmental adaptability. The theoretical specific energy of lithium-sulfur batteries is 2600Wh / kg, which is an important direction for the development of next-generation high-energy-density battery technology. However, the low electronic conductivity of elemental sulfur and its discharge products, and the shuttling side reactions of soluble polysulfide products lead to low capacity utilization efficiency of cathode materials, poor cycle stability, and limited power performance, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/052
CPCH01M4/13H01M4/139H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 彭思侃王晨燕绍九王楠
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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