Sealed Nickel-Zinc Rechargeable Batteries.
Final rept. 31 Mar 71-30 Mar 72,
ENERGY RESEARCH CORP BETHEL CONN
Pagination or Media Count:
Data are presented which show that high energy sealed nickel-zinc cells are at present capable of over 300 maintenance free cycles at 62 depth of discharge. Energy densities range from 25 - 30 Whlb at rates of discharge of 3C to C4. Improved inorganic separators ERC-2001 are discussed which contain a metallic layer hydroxide in combination with 20 by weight Teflon binder. These separators are ultra-thin, can easily be folded, and maintain their physical integrity during cycling. The rate of oxygen recombination in sealed cells has been improved through the use of silver-mercury recombination electrodes. Dissection of a representative cell with 2001 separators after 315 cycles showed that no zinc was present in the separators, negative electrode shape change was 32 and the positive electrodes had increased an average 20 in thickness.
- Electrochemical Energy Storage