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Charge storage device and method of manufacturing it

A technology for charge storage and electrical equipment, applied in capacitor manufacturing, hybrid/electric double-layer capacitor manufacturing, circuits, etc., can solve problems such as limiting power improvement and storage performance, limiting SP energy capacity, etc., to enhance energy capacity and power capacity. , the effect of battery voltage extension

Inactive Publication Date: 2013-11-06
UNIVERSITY OF NOTTINGHAM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this will significantly limit the energy capacity of the SP, limiting its power boosting and storage performance within electronic or electrical circuits

Method used

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  • Charge storage device and method of manufacturing it
  • Charge storage device and method of manufacturing it
  • Charge storage device and method of manufacturing it

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Embodiment Construction

[0045] refer to figure 1 , shows a display of experimental data to assess the battery voltage limiting electrode and what effect it has on the energy capacity of conventional supercapacitors. This data comes from electrodes based on conducting polymers, commonly used on supercapacitors due to their large pseudocapacitance and relatively low cost. Conducting polymers exhibit many improved properties when combined with nanoscale carbon nanotubes (CNTs), including electrode capacitance, exploitable potential range, and cycling stability. A special case is polyaniline (PAN), which has a very high theoretical specific capacitance (750 Farads / g) and excellent charge-discharge cycle stability. However, PAN has a small usable potential range of 0.7-0.8 volts in acidic aqueous electrolytes. The result is that despite the ultrahigh specific capacitance of the polymer, the energy capacity and power capability of PAN-based symmetric SPs are suppressed, as shown in Equation (1). By elec...

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Abstract

The present invention provides a charge storage device, comprising a pair of electrodes, each electrode being operable to store electric charge and having a respective capacitance Cp, CN that is different to the other, with the ratio of the capacitances CP / CN being greater than 1. In exemplary embodiments, the charge storage device may be an asymmetrical supercapacitor, which is operable to provide an enhanced energy capacity by increasing the cell voltage through unequalising the electrode capacitance. Hence, by increasing the CP / CN ratio an improved power capability can be achieved over conventional devices, while offering a simple and low cost manufacturing strategy. The present invention has particular application with cameras, electric vehicles, elevators, renewable energy stores, fuel cells, batteries and many forms of electronic devices.

Description

technical field [0001] This invention relates to charge storage devices and, more particularly, to an improved capacitor and method of making such a capacitor. Background technique [0002] Capacitors are commonly used in electronic and electrical circuits to store charge and provide power to other components within the circuit. One specific form of capacitor is known as a "supercapacitor" (SP). [0003] Supercapacitors (SPs) are capable of boosting power in electronic circuits and are widely used in, for example, video cameras, electric vehicles, elevators, renewable energy storage, and grid load-balancing systems, etc. However, a known disadvantage of conventional SPs is that they generally have a lower energy capacity compared to batteries and battery packs, etc. Therefore they may not be suitable for certain devices and applications, especially those with relatively high power requirements. [0004] The energy stored in the SP (in fact, generally in all capacitors), E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/22H01G11/86
CPCY02T10/7022Y02E60/13H01G11/24B82Y99/00H01G11/22H01G9/058H01G13/00H01G11/04H01G11/36Y02T10/70H01G9/155H01G9/00H01G11/30H01G11/48
Inventor 彭创陈政
Owner UNIVERSITY OF NOTTINGHAM
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