Ultracapacitors for hybrid electric vehicles will undoubtedly require use of aqueous sulfuric acid electrolyte for optimum ionic conductance. The added expense of the electronic control systems for efficient power management becomes extremely prohibitive when nonaqueous electrolytes are used (despite the higher cell voltages possible) due to reduced ionic conductance by approximately two orders of magnitude. Efforts with molybdenum nitride/aqueous sulfuric acid ultracapacitor systems will continue to attempt to validate a methodology to ensure long term performance comparable to that offered by the traditional ultracapacitor. For applications which do not require optimum power density, it is possible to achieve increased energy density through use of nonaqueous electrolytes offering higher cell voltages. Lithium perchlorate/ propylene-ethylene carbonate and methide based liquid salts are examples of electrolytes that can approach 5-volt cell operation and hold considerable promise for future ultracapacitor designs. However, a substantial increase in the average pore size of the electrode coating may be required to facilitate more rapid charging and discharging of such devices. Hermetically sealed cells of rolled electrode internal construction can be envisioned which may someday compete with rechargeable batteries in some applications.


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    Title :

    New developments in ultracapacitor technology


    Additional title:

    Neue Entwicklungslinien auf dem Gebiet der Höchstspeichertechnologie


    Contributors:
    Finello, D. (author)


    Publication date :

    1994


    Size :

    8 Seiten, 1 Tabelle, 2 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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