Positive plate of asymmetric supercapacitor and preparation method and application thereof

A technology for supercapacitors and positive plates, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc. It can solve the problems of poor cycle life of supercapacitors, achieve low prices, improve cycle life, and reduce decomposition.

Active Publication Date: 2017-01-04
江苏尊道科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this supercapacitor, the dissolution of metal elements in the positive electrode material lithium nickel manganese oxide, and the decomposition of the electrolyte is easy to be catalyzed at a high voltage of 4.7V, resulting in a poor cycle life of the supercapacitor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of positive electrode sheet:

[0024] (1) Before the active material spinel LiNi 0.5 mn 1.5 o 4 The surface of the particle is uniformly coated with a layer of graphene. The specific operation is: first spinel LiNi 0.5 mn 1.5 o 4 The powder and the graphene dispersion are mixed uniformly in the required ratio, and then the lithium nickel manganese oxide coated with graphene is obtained by spray drying technology, and the weight ratio of graphene and lithium nickel manganese oxide is 5%; then by atomic layer deposition (ALD ) technology, a layer of Al with a thickness of 2nm is coated on the surface of the resulting graphene layer 2 o 3 ;

[0025] (2) the double-coated spinel LiNi obtained in step (1) 0.5 mn 1.5 o 4 , conductive carbon black (Super-P), and PVDF are mixed according to a mass ratio of 87:8:5 (the total mass of the three is 300g), adjusted into a slurry with NMP, and then coated on an aluminum foil, and after drying, roll pressing, Th...

Embodiment 2

[0031] Preparation of positive electrode sheet:

[0032] (1) Before the active material spinel LiNi 0.5 mn 1.5 o 4 The surface of the particle is evenly coated with a layer of graphene, the weight ratio of graphene to active material is 5%, and then through atomic layer deposition (ALD) technology, a layer of TiO with a thickness of 2nm is coated on the surface of the obtained graphene layer. 2 ;

[0033] (2) the double-coated spinel LiNi obtained in step (1) 0.5 mn 1.5 o 4 , conductive graphite (SFG-6), conductive carbon black (Super-P), and PVDF are mixed in a mass ratio of 90:2:3:5 (the total mass of the three is 300g), and NMP is used to make a slurry, and then coated on Aluminum foil, after drying, roll pressing, cutting into pieces, and vacuum drying to make a positive electrode sheet with a thickness of 120um.

[0034] Production of negative electrode sheet:

[0035] Mix activated carbon with a total mass of 200g, conductive graphite (KS-6), conductive carbon bl...

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Abstract

The invention belongs to the technical field of supercapacitors, and specifically relates to a positive plate of an asymmetric supercapacitor and a preparation method and application thereof. The positive plate comprises an active substance and a wrapping layer arranged on the surface of the active substance, the active substance is lithium manganese nickel oxide, the surface of the active substance is directly wrapped by a graphene layer, and the surface of the graphene layer is also wrapped by a transition metal oxide layer. Therefore, the dissolution of metal ions in the positive electrode active material is effectively prevented, the dissolution of electrolyte is reduced, the cycle life of the whole supercapacitor is prolonged, and the asymmetric supercapacitor comprising the positive plate is advantaged by high energy and high power density.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, in particular to a positive plate of an asymmetric supercapacitor and a preparation method and application thereof. Background technique [0002] Supercapacitors, also often called electrochemical capacitors, are a new type of energy storage device emerging in the 1970s that can provide high power and have a long life. It is a new type of component that has both capacitance and battery characteristics. According to different energy storage mechanisms, electrochemical capacitors can be divided into two categories: electric double layer capacitors and Faraday quasi-capacitors. [0003] Today's commercialized symmetrical C-C structure electric double layer supercapacitors, the electrolyte is composed of ammonium salt and high conductivity organic solvent (such as acetonitrile). The power density of this capacitor is very high, but its energy density can only reach 2~ 5Wh / kg. The energy den...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/26H01G11/32H01G11/86
CPCY02E60/13H01G11/46H01G11/26H01G11/32H01G11/86
Inventor 孟涛宋勃谭晓文冯园田兴新
Owner 江苏尊道科技有限公司
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