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Preparation method and application of a high energy density lithium-sulfur battery electrode

A high-energy density, lithium-sulfur battery technology, applied in battery electrodes, electrode manufacturing, lithium batteries, etc., can solve the problem of poor conductivity of electrode materials, and achieve the effect of improving conductivity, energy density, and load capacity

Active Publication Date: 2017-08-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method and application of a lithium-sulfur battery electrode with high energy density, introduce a three-dimensional conductive carbon fiber network structure into the lithium-sulfur battery, and solve the problems of poor conductivity of electrode materials

Method used

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  • Preparation method and application of a high energy density lithium-sulfur battery electrode
  • Preparation method and application of a high energy density lithium-sulfur battery electrode
  • Preparation method and application of a high energy density lithium-sulfur battery electrode

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preparation example Construction

[0034] The three-dimensional flexible high-conductivity carbon fiber network is a three-dimensional carbon current collector with high flexibility and excellent conductivity after high-temperature carbonization. The three-dimensional conductive carbon fiber network is prepared by heat treatment of absorbent cotton at a high temperature of 800 to 1200 ℃ (see patent: application number 201510069412.5 , A method for preparing flexible and highly conductive three-dimensional interconnected hollow carbon fiber), which exhibits excellent flexibility and good conductivity. The method uses long-fiber cellulose filaments (absorbent cotton) as raw materials to carbonize and crystallize the material through high-temperature treatment to obtain a volume-controllable, hollow, highly conductive, and flexible carbon fiber network structure. The diameter of the hollow carbon fiber is 1-100. Micron, the inner diameter is 0.5-90 microns, the specific steps are as follows:

[0035] (1) Take the lon...

Embodiment 1

[0046] Preparation of conductive carbon black sulfur slurry

[0047] Take sublimed sulfur powder and conductive carbon black (mass ratio 9:1), a total of 2g, and add 45ml of N-methylpyrrolidone (NMP). Disperse in the cell ultrasonic pulverizer, the power is 90w, after 30 minutes of ultrasonic, a uniform black dispersion (such as figure 1 , The left sample).

Embodiment 2

[0049] Take sublimed sulfur powder, acidified multi-walled carbon nanotubes and conductive carbon black (mass ratio 9:0.5:0.5), a total of 2g, add 45ml of N-methylpyrrolidone (NMP), and disperse in a cell ultrasonic pulverizer. Under the power of 90w, after 30 minutes of ultrasound, a uniform black dispersion (such as figure 1 , The right sample).

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Abstract

The invention relates to the field of lithium sulfur batteries for electrochemical energy storage and in particular relates to a preparation method and application of a high-energy density lithium sulfur battery electrode. The preparation method comprises the following steps: preparing a three-dimensional conductive carbon fiber network; mixing carbon nano tubes, conductive carbon black and elemental sulfur to form uniform elemental sulfur slurry, by taking the three-dimensional conductive carbon fiber network as a current collector, directly immersing the three-dimensional conductive carbon fiber network in the elemental sulfur slurry, injecting the elemental sulfur slurry for drying, forming a carbon / sulfur composite lithium sulfur battery electrode through which sulfur is uniformly distributed in the three-dimensional conductive carbon fiber network, and further assembling the battery to prepare the high-energy density lithium sulfur battery. By utilizing the three-dimensional flexible high-conductivity carbon fiber network and highly dispersed elemental sulfur slurry in the electrode preparation process, a positive electrode material with high sulfur loading capacity is obtained, so that extremely high specific capacity and excellent cycle performance are achieved under the condition that the lithium sulfur battery is high in sulfur loading capacity in unit area.

Description

Technical field [0001] The invention relates to the field of lithium-sulfur batteries used for electrochemical energy storage, in particular to a preparation method and application of a lithium-sulfur battery electrode with high energy density. Background technique [0002] At present, the energy density of lithium-ion batteries has been difficult to meet the rapidly increasing use requirements of electric vehicles and mobile electronic devices, so it is imperative to develop new types of secondary batteries with higher energy density. The lithium-sulfur battery with elemental sulfur as the cathode material has a high theoretical specific capacity (1675mAh g -1 ) And theoretical specific energy (2600Wh kg -1 ), is considered to be one of the best candidates for the next generation of high energy density secondary batteries. However, due to the electronic insulation properties of elemental sulfur and the "shuttle effect" caused by the dissolution of polysulfides, the intermediate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/62H01M4/66H01M10/052
CPCH01M4/139H01M4/362H01M4/625H01M4/663H01M10/052Y02E60/10
Inventor 刘畅赵石永方若翩侯鹏翔李峰成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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