Lightweight pressure vessels and unitized regenerative fuel cells

Technical Report · Tue Dec 31 04:00:00 EST 1996

DOI:https://doi.org/10.2172/460339· OSTI ID:460339

Mitlitsky, F.; Myers, B.; Weisberg, A. H. ^[1]

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1. Lawrence Livermore National Lab., CA (United States)

High specific energy (>400 Wh/kg) energy storage systems have been designed using lightweight pressure vessels in conjunction with unitized regenerative fuel cells (URFCs). URFCs produce power and electrolytically regenerate their reactants using a single stack of reversible cells. Although a rechargeable energy storage system with such high specific energy has not yet been fabricated, we have made progress towards this goal. A primary fuel cell (FC) test rig with a single cell (0.05 ft{sup 2} active area) has been modified and operated reversibly as a URFC. This URFC uses bifunctional electrodes (oxidation and reduction electrodes reverse roles when switching from charge to discharge, as with a rechargeable battery) and cathode feed electrolysis (water is fed from the oxygen side of the cell). Lightweight pressure vessels with state-of-the-art performance factors (burst pressure * internal volume/tank weight = Pb V/W) have been designed and fabricated. These vessels provide a lightweight means of storing reactant gases required for fuel cells (FCs) or URFCs. The vessels use lightweight bladder liners that act as inflatable mandrels for composite overwrap and provide the permeation barrier for gas storage. The bladders are fabricated using materials that are compatible with humidified gases which may be created by the electrolysis of water and are compatible with elevated temperatures that occur during fast fills.

• Research Organization: Fuel Cell Seminar Organizing Committee (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 460339
• Report Number(s): CONF-961107--Absts.; ON: TI97001494
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
33 ADVANCED PROPULSION SYSTEMS
DESIGN
ELECTRIC-POWERED VEHICLES
ELECTROLYSIS
ENERGY STORAGE SYSTEMS
LINERS
PRESSURE VESSELS
REGENERATIVE FUEL CELLS
SOLID ELECTROLYTES