Stability enhancing additive for electrochemical devices

A stabilizer and energy storage device technology, applied in the field of agent improvement ED, can solve problems such as stable electrolyte instability

Active Publication Date: 2016-02-24
系统动力建造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, known stable electrolytes may become unstable under unfavorable operating conditions such as high voltage or high temperature conditions

Method used

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  • Stability enhancing additive for electrochemical devices
  • Stability enhancing additive for electrochemical devices
  • Stability enhancing additive for electrochemical devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The first EDLC (also referred to as "EDLC1") was prepared similarly to EDLC1, but now included benzonitrile in the electrolyte formulation in an amount of about 1% by volume of acetonitrile. Two replicas of EDLC1 (designated "EDLC1-1" and "EDLC1-2") were prepared and subjected to durability testing separately.

Embodiment 2

[0066] A second EDLC (also referred to as "EDLC2") was prepared similarly to Comp. EDLC2, but now included benzonitrile in the electrolyte formulation in an amount of about 1% by volume of acetonitrile. Four replicas of EDLC2 (referred to as "EDLC2-1", "EDLC2-2", "EDLC2-3" and "EDLC2-4") were prepared and individually tested for gas generation under the durability test conditions The height of each EDLC2 cylindrical cell increases.

Embodiment 3

[0068] A third EDLC (also referred to as "EDLC3") was prepared similarly to Comp. EDLC2, but now included benzonitrile in the electrolyte formulation in an amount of about 2% by volume of acetonitrile. Four replicas of EDLC3 (referred to as "EDLC3-1", "EDLC3-2", "EDLC3-3" and "EDLC3-4") were prepared and individually tested for gas generation under the durability test conditions The height of each EDLC3 cylindrical cell increases.

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Abstract

Embodiments described herein relate generally to electric double layer capacitors having an electrolyte formulation that includes a quantity of a stabilizing additive such that the electrochemical double layer capacitors retain cell capacitance for longer periods of time, generate less gas during operation, and experience less long term ESR. In some embodiments, an electrolyte formulation includes an ionic species, a solvent, and a stabilizer. In some embodiments the stabilizer contains a moiety that promotes adsorption to a surface, such as a carbon surface, and a moiety that promotes polarity of the stabilizer. In some embodiments, the solvent can be a nitrile compound and the stabilizer can be a compound of the formula I: Such that R is H, saturated or unsaturated, linear or branched, acyclic carbon group, OH, halogen NH2, NO2, (SO)2CF3, or monocyclic or polycyclic aryl, and n is an integer from 0 to 5.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to US Provisional Patent Application Serial No. 61 / 845,404, filed July 12, 2013, entitled "Stability Enhancing Additive for Electrochemical Devices," the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Embodiments described herein generally relate to electric double-layer capacitors having an electrolyte formulation that includes stabilizing additives such that the electric double-layer capacitor retains its battery capacity for a longer period of time with ESR gain during battery operation. ) and reduced gas production. [0004] Electric double-layer capacitors (EDLCs), also known as supercapacitors or supercapacitors, are typically capable of rapidly transferring electrical energy for a short period of time. Therefore, EDLCs are well suited for high power applications such as energy backup in PC cards, CF cards, mini PC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/58H01G11/60H01G11/62
CPCY02E60/13H01G11/60H01G11/64Y02T10/70H01G11/84
Inventor G·H·雷恩K·鲁迪苏艾拉
Owner 系统动力建造有限责任公司
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