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Electrolyte

A technology of electrolyte and capacitor, applied in the field of electrolyte, can solve the problem of supercapacitor not operating alone

Inactive Publication Date: 2014-03-05
CAP XX LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0047] Second, one must keep in mind when selecting an electrolyte system: supercapacitors do not operate alone
Typical electrolytes exhibit unacceptably high rates of ESR rise in many cases

Method used

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Examples

Experimental program
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Effect test

example 1

[0087] Example 1: Benzonitrile Additive

[0088] According to the applicant's previously published patent specifications (see, for example, PCT / AU98 / 00406 (WO98 / 054739), PCT / AU99 / 00278 (WO99 / 053510), PCT / AU99 / 00780 (WO00 / 016352), PCT / AU99 / 01081 (WO00 / 034964), PCT / AU00 / 00836 (WO01 / 004920), PCT / AU01 / 00553 (WO01 / 089058)) to prepare supercapacitors.

[0089] An electrode sheet was formed on a 22 μm thick aluminum foil with a carbon coating including activated carbon, a binder, and conductive carbon. Two 29 cm 2 Carbon-coated electrodes of about 6 μm thickness are used to fabricate the battery. The entire half is then folded to create a flat stack of electrodes, with bare aluminum tabs extending from each electrode. Then, the stack was partially enclosed in a laminated pack with an EAA heat-sealing layer to fabricate a supercapacitor cell. This packaged dry cell was then dried in an inert atmosphere. Simultaneously, still under an inert atmosphere, each stack was saturated wi...

example 2

[0102] Example 2: Cinnamonitrile Additive

[0103] Supercapacitor cells were prepared in a manner similar to that described above, except that cinnamonitrile (3-phenylacrylonitrile) was used instead of benzonitrile, and a 25 μm, high-porosity PTFE separator was used. The results of the ESR rise rate and capacitance loss rate calculated from the lifetime data between 400h and 600h are shown in Table 2 below:

[0104] Table 2: Average ESR and capacitance at different points during lifetime testing at 70°C and 2.3V, with associated rates of change (values ​​in parentheses are standard deviations), illustrating the benefit of adding cinnamonitrile.

[0105]

[0106] From the above results it can be seen that the use of cinnamonitrile as a stabilizing additive provides better results (than in the absence of cinnamonitrile) in terms of capacitance loss over the lifetime of the supercapacitor. Although the observed rate of ESR rise is not suppressed by high concentrations of cinn...

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Abstract

Provided are an electrolyte system suitable for use in an energy storage device (such as a supercapacitor), energy devices which comprising the electrolyte system which is made up of an ionic liquid, such as Li or EMI TFSI and a stabilising amount of a stabilising additive. The stabilising additive preferably contains nitrile and or aromatic (benzene) groups, and may be advantageously benzonitrile, cinnamonitrile or succinonitrile. The stabilising additive stabilises the energy storage device against ESR rise and / or capacitance loss but does not adversely affect other performance characteristics of the ionic liquid.

Description

technical field [0001] The invention relates to an electrolyte for an energy storage device. In particular, the present invention relates to a nonaqueous electrolyte capable of providing enhanced performance in batteries, capacitors, supercapacitors, and the like. [0002] The present invention was primarily developed for supercapacitors and will be described below with reference to this use. However, it will be appreciated that the invention is not limited to this particular field of use, and is also applicable to other energy storage devices, such as batteries, fuel cells, pseudocapacitors, capacitors and hybrids of one or more of these devices. Background of the invention [0003] Any discussion of prior art in the specification should not be considered as an admission that such prior art is widely known or forms part of the common general knowledge in the field. [0004] Supercapacitor (supercapacitor) also refers to ultra capacitor (ultra capacitor), electrochemical d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/64H01G11/62
CPCY02E60/12H01M10/0567H01M10/0569H01M2300/0022H01G11/64H01G11/62Y02E60/13Y02E60/10
Inventor 亚历山大·比利克菲利普·布雷特·艾奇森艾伦·戈斯克·拉森约翰·齐·亨·源妮可·范·德·拉克
Owner CAP XX LTD
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