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Production method of flexible self-support lithium-sulfur-battery positive-electrode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor cycle life of lithium-sulfur batteries, poor conductivity of active materials, large changes in electrode volume, etc., to achieve good practicality Sexuality, low cost, and the effect of alleviating the loss of dissolution

Inactive Publication Date: 2018-04-24
宁波丰羽新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the poor conductivity of active materials in lithium-sulfur batteries, the large change in electrode volume during charging and discharging, the solubility of intermediate products in the electrolyte and the accompanying "shuttle effect", etc., lead to poor cycle life of lithium-sulfur batteries and hinder their development. Commercialization Development (Manthiram A, Account of Chemical Research. 2013, 46, 1125-1134)

Method used

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  • Production method of flexible self-support lithium-sulfur-battery positive-electrode material
  • Production method of flexible self-support lithium-sulfur-battery positive-electrode material
  • Production method of flexible self-support lithium-sulfur-battery positive-electrode material

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Effect test

Embodiment 1

[0021] Copper nitrate and aminoethanol were uniformly mixed in the solution, and the copper hydroxide nanowire dispersion was obtained after soaking for 2 days. The single-walled carbon nanotubes were heated and oxidized in nitric acid at 80° C. for 1 day to obtain carbon nanotubes with negatively charged surfaces. The obtained 1mg copper hydroxide nanowires and 2mg carbon nanotubes are uniformly dispersed and mixed in water according to a certain mass ratio, then suction-filtered and dried on a porous substrate with a diameter of 2cm to obtain a self-supporting copper hydroxide / carbon nanotube composite membrane. The obtained copper hydroxide / CNT composite film was soaked in 20 mM trimesic acid water / ethanol mixed solution, and the solvent volume ratio was 1:1. A self-supporting HKUST-1 / CNT composite film was obtained after soaking at room temperature for 1 h. Dissolve sublimed sulfur in CS with stirring at room temperature 2 Get S / CS in 2 solution. The obtained solution ...

Embodiment 2

[0023] The zinc nitrate and aminoethanol were uniformly mixed in the solution, and the zinc hydroxide nanowire dispersion was obtained after soaking for 2 days. The single-walled carbon nanotubes were heated and oxidized in nitric acid at 80° C. for 1 day to obtain carbon nanotubes with negatively charged surfaces. The resulting 1 mg zinc hydroxide nanowires and 2 mg carbon nanotubes were uniformly dispersed and mixed in water, filtered on a porous substrate with a diameter of 2 cm, and dried to obtain a self-supporting zinc hydroxide / carbon nanotube composite membrane. The obtained zinc hydroxide / CNT composite film was soaked in 25 mM 2-methylimidazole water / ethanol mixed solution, and the solvent volume ratio was 4:1. A self-supporting ZIF-8 / CNT composite film was obtained after soaking at room temperature for 24 h. Dissolve sublimed sulfur in CS with stirring at room temperature 2 Get S / CS in 2 solution. The obtained solution was added to the obtained ZIF-8 / CNT composit...

Embodiment 3

[0025] The zinc nitrate and aminoethanol were uniformly mixed in the solution, and the zinc hydroxide nanowire dispersion was obtained after soaking for 2 days. The single-walled carbon nanotubes were heated and oxidized in nitric acid at 80° C. for 1 day to obtain carbon nanotubes with negatively charged surfaces. The resulting 1 mg zinc hydroxide nanowires and 2 mg carbon nanotubes were uniformly dispersed and mixed in water, filtered on a porous substrate with a diameter of 2 cm, and dried to obtain a self-supporting zinc hydroxide / carbon nanotube composite membrane. The obtained zinc hydroxide / CNT composite film was soaked in 20 mM terephthalic acid water / ethanol mixed solution, and the solvent volume ratio was 4:1. A self-supporting ZIF-5 / CNT composite film was obtained after soaking at 120°C for 12 h. Dissolve sublimed sulfur in CS with stirring at room temperature 2 Get S / CS in 2 solution. The obtained solution was added to the obtained ZIF-5 / CNT composite film acco...

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Abstract

The invention discloses a production method of a flexible self-support lithium-sulfur-battery positive-electrode material. The production method has the advantages that an MOF / CNT self-support composite membrane is used as the conductive substrate of an active substance, the active substance sulfur is effectively bound in MOF holes by utilizing the rich hole structures of MOF, the dissolving lossof the active substance sulfur is relieved, and a battery shuttle effect is inhibited; CNT allows an electrode to have good conductivity, guarantees the electrochemical kinetics properties of the active substance and also allows the electrode to have high mechanical stability and self-support performance; by the synergic effect of the MOF material and the CNT, high battery capacity and high battery circulating stability are achieved; the method is simple, low in cost, capable of being favorably popularized, evident in effect, good in practicality and capable of being widely applied in new-generation high-energy flexible batteries.

Description

technical field [0001] The invention relates to a lithium-sulfur secondary battery, in particular to a flexible self-supporting lithium-sulfur battery cathode material. technical background [0002] With the increasing prominence of energy and environmental issues and the continuous development of electronic and electric equipment, people have put forward higher requirements for energy storage systems. Traditional lithium-ion batteries are widely used in market-oriented electronic and electric equipment due to their long cycle life and good safety. However, due to their relatively low theoretical specific capacity, it has gradually become difficult to meet the needs of social development for high specific energy of batteries. . Lithium-sulfur battery is a battery system with elemental sulfur as the positive electrode and metallic lithium as the negative electrode. Its theoretical specific capacity is as high as 2600Wh kg -1 , and at the same time, the positive electrode ac...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/139H01M10/052
CPCH01M4/139H01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 黎军刘培杨
Owner 宁波丰羽新材料科技有限公司
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