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Cyanopolymer modified sulfur cathode and high-performance lithium sulfur battery composed of same

A lithium-sulfur battery and sulfur cathode technology, applied in the field of high-performance lithium-sulfur batteries, can solve the problems of high sulfur content, thick conductive layer thickness, and inability to obtain cathode materials.

Inactive Publication Date: 2019-08-06
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN103515646A reported a conductive polymer barrier layer and used in Li-S batteries, 900 mAh g after 100 cycles -1 capacity, but the thickness of the conductive layer is thicker, which will reduce the overall energy density of the battery
Chinese patent CN102664264A discloses a sulfur-containing polymer cathode material prepared by co-sintering polysulfide rubber and sulfur. This method cannot obtain a higher sulfur content in the cathode material
In summary, these methods can improve the utilization rate of sulfur to a certain extent, but fail to fundamentally solve the problem of lithium polysulfide dissolution shuttling, and the performance of lithium-sulfur batteries still needs to be improved.

Method used

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  • Cyanopolymer modified sulfur cathode and high-performance lithium sulfur battery composed of same
  • Cyanopolymer modified sulfur cathode and high-performance lithium sulfur battery composed of same
  • Cyanopolymer modified sulfur cathode and high-performance lithium sulfur battery composed of same

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Experimental program
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Effect test

Embodiment 1

[0024] A sodium alginate solution with a mass fraction of 5% was configured, and the sulfur-carbon composite material, conductive carbon black, and sodium alginate solution (5%) were weighed according to a mass ratio of 8:1:1 to prepare positive electrode slurry. The slurry was then knife-coated onto the aluminum current collector, 35 o C drying to obtain the positive electrode sheet. Weigh 0.1 g of ethyl cyanoacrylate, add it into a vial containing 10 g of acetone, stir evenly, seal it up, and set aside. Scrape-coat the prepared ethyl cyanoacrylate onto the sulfur cathode to obtain a polyethylcyanoacrylate-coated sulfur cathode.

Embodiment 2

[0026] Prepare an acrylonitrile copolymer solution with a mass fraction of 15%, and weigh elemental sulfur, Ketjen black, and acrylonitrile copolymer solution (15%) according to a mass ratio of 7:2:1 to prepare a sulfur positive electrode slurry. Foil as current collector, 50 o C drying, weigh 0.5g ethyl cyanoacrylate, add it in the vial that 10 g acetone is housed, magnetically stir evenly, seal up, and set aside. Scrape-coat the prepared ethyl cyanoacrylate onto the sulfur cathode to obtain a polyethylcyanoacrylate-coated sulfur cathode.

Embodiment 3

[0028] Configure a sodium alginate solution with a mass fraction of 10%, and weigh the sulfur-carbon composite material, graphene, and sodium alginate solution (10%) at a mass ratio of 6:3:1 to prepare sulfur positive electrode slurry, and use aluminum foil As a current collector, 60 o Dry at C, weigh 0.7g of ethyl cyanoacrylate, add it into a vial containing 10 g of N,N-dimethylacetamide, stir evenly with magnetic force, seal it up, and keep it for later use. Scrape-coat the prepared methyl cyanoacrylate on the sulfur cathode to obtain a polyethylcyanoacrylate-coated sulfur cathode.

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Abstract

The invention belongs to the technical field of lithium sulfur batteries, in particular to a cyanopolymer modified sulfur cathode and a high-performance lithium sulfur battery composed of the same. The main component of the coating of the sulfur cathode of the invention is cyanopolymer, and the sulfur cathode is obtained by modifying the surface of the sulfur cathode with cyanopolymer through scrape-coating (or spin-coating, spray-coating or transfer-printing) and drying the cyanopolymer. The method provided by the invention is simple to operate and easy to apply, and the polymer coating can adsorb polysulfides and inhibit the 'shuttle effect' of polysulfides. Therefore, the long cycle stability and specific discharge capacity of lithium sulfur batteries are greatly improved, and a new method is provided for the development of long-life lithium sulfur batteries.

Description

technical field [0001] The invention relates to a lithium-sulfur battery; the invention also relates to a sulfur positive electrode modified by a cyanopolymer and a high-performance lithium-sulfur battery formed thereof. Background technique [0002] Advances in lithium-ion battery technology have greatly facilitated the development of portable electronic devices over the past 20 years. In recent years, with the development and application of mobile intelligent terminal equipment and new energy vehicles, there is an urgent need for secondary battery technology with lower development costs and higher energy density. Li-S battery based on two-electron reaction with 1675 mAh g -1 Theoretical specific capacity and 2600 Wh kg -1 Theoretical specific energy, and sulfur widely exists in nature with low cost. Therefore, lithium-sulfur batteries are expected to become the next generation of high-performance energy storage batteries to replace lithium-ion batteries. [0003] The c...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/38H01M4/62H01M10/052H01M10/058
CPCH01M4/13H01M4/139H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 崔光磊张建军杨金凤曲红涛张敏徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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