H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 4/24 (2006.01) H01M 10/26 (2006.01) H01M 4/58 (2006.01)
Patent
CA 2107440
A cathode material made of anhydrous ferric sulfate with a hexagonal crystal structure is presented for use in a secondary battery which generates a stable open-circuit-voltage of about 3.6 volts and offers a recharge cycling capacity of over 100 times. The cathode material is obtained by heating hydrous iron sulfate material in a temperature range between 250 and 600 °C to remove the water of crystallization. The secondary battery made with this cathode material provides a long-service life and a stable output voltage economically, because the starting material, iron sulfate, is abundantly available at relatively low cost.
Cette invention concerne un matériau cathodique fait de sulfate ferrique anhydre à structure cristalline hexagonale et destiné à une batterie secondaire générant une tension à vide stable d'environ 3,6 volts et offrant une possibilité de plus 100 cycles de recharge. Le matériau visé par l'invention est obtenu en chauffant un sulfate de fer hydraté à une température comprise entre 250 et 600 degrés Celsius afin de le débarrasser de l'eau de cristallisation.. La batterie secondaire équipée de ce type de cathode constitue une source d'énergie économique à durée utile allongée offrant l'avantage d'une tension de sortie stable. Le faible coût s'explique par l'abondance de la matière première, le sulfate de fer.
Arai Hajime
Ichimura Masahiro
Ohtsuka Hideaki
Okada Shigeto
Shibata Masasi
Marks & Clerk
Nippon Telegraph & Telephone Corporation
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