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Nitrogen functionalized cross-linked polymer binder and lithium-sulfur battery positive electrode material

A technology of cross-linked polymer and positive electrode material is applied in the preparation of positive electrode material of lithium-sulfur battery and the field of cross-linked polymer binder, which can solve the problems of complicated preparation process of porous carbon material, high cost, and low energy density of positive electrode, etc. Achieve the effect of improving charge-discharge cycle performance, strong adhesion, limiting diffusion and loss

Inactive Publication Date: 2018-10-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of porous carbon materials can significantly inhibit the dissolution and diffusion of polysulfide ions and improve the cycle stability of the battery, but excessive addition of carbon materials will lead to a decrease in the energy density of the positive electrode. The preparation process of porous carbon materials is generally more complicated and costly. It is also relatively high, and it is difficult to move from the laboratory to the industrialization

Method used

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  • Nitrogen functionalized cross-linked polymer binder and lithium-sulfur battery positive electrode material
  • Nitrogen functionalized cross-linked polymer binder and lithium-sulfur battery positive electrode material

Examples

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Embodiment 1

[0025] A nitrogen-functionalized cross-linked polymer binder consisting of bisphenol A-type epoxy resin and polyethyleneimine. The mass ratio of bisphenol A epoxy resin and polyethyleneimine is 1.

[0026] A preparation method for a lithium-sulfur battery cathode material containing a nitrogen-functionalized cross-linked polymer binder, comprising the following steps:

[0027] (1) Dissolve 0.5 parts of polyethyleneimine and 0.5 parts of bisphenol A epoxy resin in N-methylpyrrolidone solvent to form a uniform solution to control the solidification of polyethyleneimine and bisphenol A epoxy resin. The content is 20% by weight.

[0028] (2) Add 7 parts of active sulfur to the above mixture of polyethyleneimine and bisphenol A epoxy resin, then add 2 parts of Super P conductive agent, stir evenly with a glass rod, and ultrasonicate at room temperature for 40 min to prepare the positive electrode mixture.

[0029] (3) After ball milling the above mixed solution at a speed of 400...

Embodiment 2

[0032] A nitrogen functionalized crosslinked polymeric binder consisting of bisphenol A type epoxy resin and polyethyleneimine. Wherein the mass ratio of the bisphenol A epoxy resin to polyethyleneimine is 2:1.

[0033] A preparation method for a lithium-sulfur battery cathode material containing a nitrogen-functionalized cross-linked polymer binder, comprising the following steps:

[0034] (1) Dissolve 0.5 parts of polyethyleneimine and 1 part of bisphenol A epoxy resin in N-methylpyrrolidone solvent to form a uniform solution to control the solidification of polyethyleneimine and bisphenol A epoxy resin. The content is 20% by weight.

[0035] (2) Add 10.5 parts of active sulfur to the above mixture of polyethyleneimine and bisphenol A epoxy resin, then add 3 parts of Super P conductive agent, stir evenly with a glass rod, and ultrasonicate for 40 minutes at room temperature , to prepare the positive electrode mixture.

[0036] (3) After ball milling the above mixed soluti...

Embodiment 3

[0039] A nitrogen functionalized crosslinked polymeric binder consisting of bisphenol A type epoxy resin and polyethyleneimine. Wherein the mass ratio of the bisphenol A epoxy resin to polyethyleneimine is 3:1.

[0040] A preparation method for a lithium-sulfur battery cathode material containing a nitrogen-functionalized cross-linked polymer binder, comprising the following steps:

[0041] (1) Dissolve 0.5 parts of polyethyleneimine and 1.5 parts of bisphenol A epoxy resin in N-methylpyrrolidone solvent to form a uniform solution to control the solidification of polyethyleneimine and bisphenol A epoxy resin. The content is 20% by weight.

[0042] (2) Add 14 parts of active sulfur to the above mixture of polyethyleneimine and bisphenol A epoxy resin, then add 4 parts of Super P conductive agent, stir evenly with a glass rod, and ultrasonicate for 40 minutes at room temperature , to prepare the positive electrode mixture.

[0043] (3) After ball milling the above mixed solut...

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Abstract

The invention discloses a nitrogen functionalized cross-linked polymer binder and a lithium-sulfur battery positive electrode material. The cross-linked polymer binder comprises the following components based on weight percentages: 10-80% of bisphenol A type epoxy resin and 20-90% of polyethyleneimine. By virtue of the nitrogen functionalized cross-linked polymer binder disclosed in the invention,the technical problem of quick degradation of the cycle performance of the battery caused by sulfur volume expansion and a shuttle effect of polysulfide ions in the charging-discharging process of the existing sulfur positive electrode material can be solved effectively.

Description

[0001] technical field [0002] The invention relates to the technical field of lithium-sulfur batteries, in particular to a nitrogen-functionalized cross-linked polymer binder and a preparation method for lithium-sulfur battery cathode materials using the binder. Background technique [0003] The theoretical energy density of lithium-sulfur batteries is as high as 2600 Wh kg -1 , where the theoretical specific capacity of the cathode sulfur material is 1675 mAh g -1 , is 10 times that of commercial lithium-ion battery cathode materials, so lithium-sulfur batteries based on sulfur cathodes have become the most promising new generation of high-performance energy storage devices. However, during the charge-discharge cycle, the volume expansion rate of the sulfur cathode is as high as 80%, and the formed polysulfide ion intermediates are easily dissolved and diffused in the electrolyte. The structural damage caused by volume expansion and the loss of active sulfur will cau...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M4/622H01M4/625H01M10/052Y02E60/10
Inventor 王拴紧姚逸闫龙龙孟跃中肖敏
Owner SUN YAT SEN UNIV
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