Preparation method of a porous carbon-based flexible lithium-sulfur battery positive electrode material

A carbon-based flexible lithium-sulfur battery technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of lithium polysulfide intermediates easily soluble in electrolyte, poor conductivity of sulfur active materials, and inability to fold and bend. The effect of slowing down the speed of dissolution and diffusion, increasing the loading capacity, and slowing down the volume expansion

Active Publication Date: 2021-03-12
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the traditional lithium-sulfur battery cannot be folded and bent, the conductivity of the sulfur active material is poor, the volume of the sulfur electrode rapidly expands and deforms after lithium intercalation, and the lithium polysulfide intermediate product generated during the discharge process is easily soluble in the electrolyte. Provided is a method for preparing a porous carbon-based flexible lithium-sulfur battery positive electrode material
[0005] In the present invention, a three-dimensional carbon-based conductive fiber network with a certain strength is selected as the carrier and conductive network of the positive electrode material of the flexible lithium-sulfur battery, and the sulfur active material is evenly dispersed in the porous network of the conductive fiber network through the method of dissolution recrystallization and high-temperature diffusion In the structure, it solves the problem that the cathode material of conventional lithium-sulfur batteries cannot be bent and folded

Method used

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  • Preparation method of a porous carbon-based flexible lithium-sulfur battery positive electrode material
  • Preparation method of a porous carbon-based flexible lithium-sulfur battery positive electrode material
  • Preparation method of a porous carbon-based flexible lithium-sulfur battery positive electrode material

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specific Embodiment approach 1

[0022] DETAILED DESCRIPTION OF THE INVENTION The present embodiment is a method of preparing a porous structure carbon-based flexible lithium sulfur battery positive material, the method specific steps are as follows:

[0023] Step 1: Three-dimensional carbon-based conductive fibers are used as a current collector, immersed in a solution containing a sulfur active material; or first immersed into the solvent as a collector, and then mixed with a solution containing a sulfur active material; The concentration of the solution containing a sulfur active substance is from 0.05 to 1.5 g / ml, which has a ambient temperature of 5 to 45 ° C;

[0024] Step 2: Under a closed vacuum condition, by oscillating the solution containing a sulfur active material to the pore structure of the three-dimensional carbon-based conductive fiber network, the same pressure condition is maintained and the stirring solvent is rotated to obtain a loaded sulfur active substance. Three-dimensional carbon based...

specific Embodiment approach 2

[0026] DETAILED DESCRIPTION OF THE INVENTION The preparation method of a porous structure carbon-based flex lithium sulfur battery positive electrode material has a rich pore structure such as a well-formed structure of the three-dimensional carbon-based flexible lithium sulfur battery. figure 1 , 2 The BET test results include micropores, mesh and large holes, and the well structure is mainly distributed over a micropores and mesh ranges of 0.5 to 3.5 nm.

specific Embodiment approach 3

[0027] DETAILED DESCRIPTION OF THE INVENTION 3: DETAILED DESCRIPTION OF THE INVENTION Method of Preparation of a Porous Structure Carbon-based Flex Lithium Sulfur Battery, Step One, the three-dimensional carbon-based conductive fiber network prepared according to the following method:

[0028] Materials in carbon fibers or forming a highly conductive carbon-based fiber are treated with a raw material, treated in an atmosphere of from 250 to 610 ° C, an oxygen volume concentration of 1% to 80%, and partially oxidize the carbon material, resulting in a ratio of strength Table area controlled, high conductive, flexible three-dimensional carbon-based conductive fiber network; the treatment temperature is 250 to 610 ° C, and the oxygen volume concentration is 1% to 80%.

[0029] The three-dimensional carbon-based conductive fiber network can be carbon-based fibers having a certain conductivity and strength of natural cellulose fibers such as bamboo, linen, cotton yarn, which are carbon...

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Abstract

The invention discloses a method for preparing a positive electrode of a carbon-based flexible lithium-sulfur battery, which belongs to the technical field of preparation of lithium-sulfur battery materials for electrochemical energy storage. First, carbon fibers are annealed in an oxidizing atmosphere to prepare a three-dimensional conductive carbon network. The three-dimensional conductive carbon fiber network is used as a current collector, and then the three-dimensional conductive carbon fiber network is immersed in sulfur carbon disulfide. Ultrasonic or mechanical vibration under vacuum makes the sulfur solution infiltrate the carbon fiber hole structure. and evaporated to dryness, and further use high-temperature gas phase diffusion to diffuse sulfur into the finer gaps of carbon fibers to form a carbon-based flexible lithium-sulfur battery positive electrode in which sulfur is evenly distributed in the three-dimensional conductive carbon fiber network. The self-supporting electrode-assembled flexible battery can maintain high and stable charge-discharge capacity under different folding angles. The preparation method of the self-supporting flexible electrode in the present invention is simple to operate, easy to produce on a large scale, can be widely used in energy storage and flexible wearable devices, and has very good practical value.

Description

Technical field [0001] The present invention belongs to the preparation of lithium sulfur battery material, and in particular, the present invention relates to a preparation method of porous structural carbon-based flex lithium sulfur battery positive electrode material. Background technique [0002] With the improvement of people's material cultural needs and the rapid development of science and technology, it is convenient and light and portable wearable electronic products to have great love, including flexible curved display, electronic paper, flexible batteries, etc. Therefore, the portable energy storage equipment will have huge market demand and space, as a high energy density, strong security, and a convenient lithium-ion battery has a large development space. At present, the energy density of lithium cobaltate, lithium manganate, lithium iron phosphate, and three-dimensional lithium ion batteries such as lithium ion batteries, which have been difficult to meet the use of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/364H01M4/5815H01M4/625Y02E60/10
Inventor 伍鹏潘跃德李素丽曾家江李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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