Electrolyte additive for hybrid supercapacitors to reduce charge transfer resistance, and hybrid supercapacitor including the same

Patent metadata

Field	Value
Publication number	US-10153097-B2
Application number	US-201715608363-A
Country	US
Kind code	B2
Filing date	May 30, 2017
Priority date	Jun 7, 2016
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A hybrid supercapacitor, including at least one negative electrode having a statically capacitive active material, an electrochemical redox-active material, or a mixture of them; at least one positive electrode having a statically capacitive active material, an electrochemical redox-active material, or a mixture of them; at least one separator situated between the at least one negative electrode and the at least one positive electrode; and an electrolyte mixture; with the provision that at least one electrode includes a statically capacitive active material, and at least one electrode includes an electrochemical, redox-active material; the electrolyte mixture being a liquid electrolyte mixture and including at least one liquid, aprotic, organic solvent, at least one conducting salt, and at least one at least partially halogenated, aromatic compound.

First claim

What is claimed is:

1. A hybrid supercapacitor, comprising:
at least one negative electrode having one of a statically capacitive active material, an electrochemical redox-active material, or a mixture of a statically capacitive active material and a electrochemical redox-active material;
at least one positive electrode having one of a statically capacitive active material, an electrochemical redox-active material, or a mixture of a statically capacitive active material and an electrochemical redox-active material;
at least one separator situated between the at least one negative electrode and the at least one positive electrode; and
an electrolyte mixture;
wherein at least one of the negative and positive electrodes includes a statically capacitive active material, and at least one of the negative and positive electrodes includes an electrochemical, redox-active material, and wherein the electrolyte mixture is a liquid electrolyte mixture and includes at least one liquid, aprotic, organic solvent, at least one conducting salt, and at least one at least partially chlorinated, aromatic compound.

2. The hybrid supercapacitor as recited in claim 1 , wherein the at least one liquid, aprotic, organic solvent is selected from acetonitrile, propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethylene methyl carbonate, ethyl methyl carbonate, as well as mixtures of them.

3. The hybrid supercapacitor as recited in claim 1 , wherein the at least one conducting salt is a lithium salt.

4. A hybrid supercapacitor, comprising:
at least one negative electrode having one of a statically capacitive active material, an electrochemical redox-active material, or a mixture of a statically capacitive active material and a electrochemical redox-active material;
at least one positive electrode having one of a statically capacitive active material, an electrochemical redox-active material, or a mixture of a statically capacitive active material and an electrochemical redox-active material;
at least one separator situated between the at least one negative electrode and the at least one positive electrode; and
an electrolyte mixture;
wherein at least one of the negative and positive electrodes includes a statically capacitive active material, and at least one of the negative and positive electrodes includes an electrochemical, redox-active material, and wherein the electrolyte mixture is a liquid electrolyte mixture and includes at least one liquid, aprotic, organic solvent, at least one conducting salt, and at least one at least partially halogenated, aromatic compound, wherein the at least one at least partially halogenated aromatic compound is 1,3,5-trifluorobenzene.

5. The hybrid supercapacitor as recited in claim 4 , wherein the at least one at least partially halogenated aromatic compound makes up to 10% by weight of the total amount of the electrolyte mixture.

6. An electrolyte mixture for a hybrid supercapacitor, comprising at least one liquid, aprotic, organic solvent, at least one conducting salt, and at least one at least partially chlorinated, aromatic compound.

7. A method of using an electrolyte mixture, comprising:
providing a hybrid supercapacitor; and
using, in the hybrid supercapacitor, an electrolyte mixture including at least one liquid, aprotic, organic solvent, at least one conducting salt, and at least one at least partially chlorinated, aromatic compound.

Assignees

• Bosch Gmbh Robert

Inventors

• Buehler Elisabeth
• Widmaier Mathias
• Hahn Severin
• Eckl Thomas

Classifications

• H01G11/60

  characterised by the solvent · CPC title

• H01G11/52

  Separators · CPC title

• H01G11/28

  arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives · CPC title

• H01G11/64 Primary

  characterised by additives · CPC title

• H01G11/30

  characterised by their material · CPC title