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A vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium sulfide battery positive electrode prepared from the film

A technology of vulcanized polyacrylonitrile and nanofiber, which is applied in battery electrodes, lithium batteries, nanotechnology, etc., can solve the problems of reducing battery energy density, making no contribution to battery capacity, and increasing battery cost, so as to improve utilization rate and save The effect of coating process and long-lasting cycle life

Inactive Publication Date: 2019-01-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal current collector, conductive carbon black and binder in the battery system do not contribute to the capacity of the battery, which not only increases the cost of the battery, but also greatly reduces the energy density of the battery

Method used

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  • A vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium sulfide battery positive electrode prepared from the film
  • A vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium sulfide battery positive electrode prepared from the film
  • A vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium sulfide battery positive electrode prepared from the film

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Embodiment 1

[0037] 1. A vulcanized polyacrylonitrile film with hollow tubular nanofibers, the specific preparation process is as follows:

[0038] (1) According to the mass ratio of 1:9, prepare a polyacrylonitrile solution with a mass fraction of 10% from polyacrylonitrile and dimethylformamide, and perform magnetic stirring for 12 hours; similarly prepare a polyacrylonitrile solution with a mass fraction of 10%. Polyethylene oxide solution, the solvent is dimethylformamide, stirred at 60°C for 3h; then, the two solutions were sonicated for 30min;

[0039](2) Composite nanofibers were prepared by coaxial electrospinning technology, in which the polyethylene oxide solution was the core layer spinning solution, the polyacrylonitrile solution was the shell layer spinning solution, and the spinning solution flow rate of the inner and outer shafts was 20uL / min , the spinning voltage is 15KV, the receiving distance of the roller is 15cm, and the rotating speed of the roller is 500r / min, the po...

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Abstract

The invention discloses a vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium sulfide battery positive electrode prepared from the film. The process of preparingthe film is as follows: S1, respectively configuring a polyacrylonitrile shell solution and a core layer solution; 2. Prepare composite nanofibers by use coaxial electrospinning technology; S3. The prepared composite nanofiber is washed in solvent, dried and vulcanized to obtain the vulcanized polyacrylonitrile film. A lithium sulfide battery positive electrode is prepare by adopting that nano-fiber in the sulfide polyacrylonitrile film of the invention, which is hollow tubular and has a great specific surface area, without the traditional coat process, and the positive electrode can be fullycontacted with the electrolyte, thereby improving the utilization rate of the electrode; at the same time, sulfide polyacrylonitrile is insoluble in the electrolyte, avoiding the shuttle effect of polysulfide, alleviating the volume expansion effect of the battery, and improving the electrochemical performance of the electrode. The positive electrode of the lithium sulfur battery has a higher energy density and a more stable and lasting cycle life.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium-sulfur batteries, and more specifically, relates to a vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium-sulfur battery cathode prepared therefrom. Background technique [0002] With the continuous development of electronic equipment and electric vehicles, secondary lithium batteries with high energy density are research hotspots and mainstream trends in the field of energy research. Due to the abundant resources of sulfur, low price and high theoretical specific capacity (1675mAh / g), lithium-sulfur batteries have great development and application potential. It can solve the problem of low specific energy density of existing commercial lithium-ion battery cathode materials (lithium iron phosphate, lithium titanate, etc.). Therefore, lithium-sulfur batteries are the main direction of development in the field of electrochemical energy st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/137H01M4/60H01M10/052B82Y30/00
CPCB82Y30/00H01M4/137H01M4/602H01M10/052Y02E60/10
Inventor 施志聪黄新月刘军王诚文
Owner GUANGDONG UNIV OF TECH
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