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An aqueous adhesive used for a sulfur cathode and applications thereof

A technology of water-based binder and sulfur positive electrode, which is applied to the sulfur positive electrode of lithium-sulfur secondary battery. , the adhesive is toxic and other problems, to achieve the effect of alleviating the volume change of the positive electrode, low cost and low cost

Active Publication Date: 2017-03-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gelatin aqueous solution system is unstable. Under the influence of acid, alkali, heat, and enzymes, the long peptide chains of its molecules will be continuously hydrolyzed to generate low-molecular-weight peptides, resulting in deterioration of performance, especially the loss of freezing ability.
In addition, Chinese patent CN1294666C discloses butadiene-based copolymers as anode binders for secondary lithium-sulfur batteries, but the electrochemical activity and reversibility of lithium-sulfur batteries provided by this method are not high, and the binder is toxic

Method used

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  • An aqueous adhesive used for a sulfur cathode and applications thereof
  • An aqueous adhesive used for a sulfur cathode and applications thereof
  • An aqueous adhesive used for a sulfur cathode and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, guar gum is used as the water-based binder for the sulfur cathode.

[0035] Sulfur-based composite material, guar gum, and graphene are uniformly dispersed in water at a mass ratio of 7:1.5:0.5, then coated on carbon-coated aluminum foil, dried, and pressed into sheets to obtain the positive electrode of a secondary lithium-sulfur battery; wherein the sulfur The matrix composite material is obtained by mixing elemental sulfur and polyacrylonitrile (weight-average molecular weight: 1 million) at a mass ratio of 4:1, then heating to 250°C under nitrogen protection and holding it for 16 hours.

[0036] The positive electrode of the secondary lithium-sulfur battery prepared in this example and the negative electrode of metal lithium constitute a lithium-sulfur secondary battery. The specific capacity of the first discharge is 1970.9mAh / g, and the specific capacity is 1286mAh / g after 100 cycles of charge-discharge cycle test. g, such as figure 1 As shown...

Embodiment 2

[0038] In this embodiment, tara gum is used as the water-based binder for the sulfur cathode.

[0039] The sulfur-based composite material, tara gum, and conductive carbon fiber are uniformly dispersed in water at a mass ratio of 9:0.5:0.5, then coated on aluminum foil, dried and pressed into sheets to obtain the positive electrode of the secondary lithium-sulfur battery; the sulfur-based composite material It is obtained by mixing elemental sulfur and polyacrylonitrile (with a weight average molecular weight of 2 million) at a mass ratio of 16:1, then heating to 400°C under nitrogen protection and keeping it warm for 1 hour.

[0040] The positive electrode of the secondary lithium-sulfur battery prepared in this example and the negative electrode of metal lithium constitute a lithium-sulfur secondary battery. The specific capacity of the first discharge is 1796mAh / g, and the specific capacity after 100 cycles of charging and discharging is 1187mAh / g. ,Such as figure 2 shown. ...

Embodiment 3

[0042] In this embodiment, Kanaya gum is used as the water-based binder for the sulfur cathode.

[0043] Disperse the sulfur-based composite material, kana gum, and carbon nanotubes uniformly in water at a mass ratio of 8:1:1, and then coat them on the nickel foam, dry and press into sheets to obtain the positive electrode of the secondary lithium-sulfur battery; wherein The sulfur-based composite material is obtained by mixing elemental sulfur and polyacrylonitrile (with a weight-average molecular weight of 100,000) at a mass ratio of 8:1, then heating to 300°C under nitrogen protection and holding it for 8 hours.

[0044] The positive electrode of the secondary lithium-sulfur battery prepared in this example and the negative electrode of metal lithium constitute a lithium-sulfur secondary battery. The specific capacity of the first discharge is 1854mAh / g, and the specific capacity is 1108mAh / g after 100 cycles of charge-discharge cycle test. ,Such as image 3 shown.

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Abstract

The invention relates to an aqueous adhesive used for a sulfur cathode and applications thereof. The aqueous adhesive is plant glue or composite glue. The plant glue is one or more selected from a group consisting of guar gum, linseed gum, fenugreek gum, agar, tara gum, peach gum, gutta percha or karaya gum. The composite glue is composite glue formed by the plant glue with carbonyl-beta-cyclodextrin, sodium carboxymethyl cellulose or poly(vinyl alcohol). The aqueous adhesive, a sulfur-containing material and an electric conductive agent are uniformly dispersed in water according to a mass ratio of 7-9:0.5-1.5:0.5-1.5, and then a current collector is coated with the mixture, dried and then pressed into a sheet to prepare a secondary lithium-sulfur battery cathode. Compared with the prior art, the aqueous adhesive has obvious advantages of environment protection, a low cost, and the like, a cathode preparing process is simple and the aqueous adhesive has a good application prospect.

Description

technical field [0001] The invention relates to a binder for an electrode and its application, in particular to a binder for a sulfur positive electrode and its application in a sulfur positive electrode of a lithium-sulfur secondary battery. Background technique [0002] Lithium-sulfur secondary battery refers to a rechargeable battery that uses metallic lithium as the negative electrode and sulfur-containing materials (including elemental sulfur, sulfur-based composite materials or organic sulfides) as the positive electrode, with high energy density (theoretical capacity density is 1672mAh / g) , long cycle life, high safety, low cost (low price of elemental sulfur) and other advantages are the development direction of the next generation of batteries. [0003] The positive electrode material is mainly composed of three parts, which are active material, binder and conductive agent. Among them, the main function of the binder is to bond and maintain the active material. Add...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M4/64H01M4/66H01M10/052
CPCH01M4/13H01M4/621H01M4/625H01M4/64H01M4/66H01M10/052Y02E60/10
Inventor 王久林李芹宇杨慧军努丽燕娜杨军
Owner SHANGHAI JIAO TONG UNIV
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