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1. WO2000039869 - WATER-ACTIVATED PRIMARY BATTERY PARTICULARLY SUITABLE FOR ENVIRONMENTALLY SAFE UNDERWATER USE

Publication Number WO/2000/039869
Publication Date 06.07.2000
International Application No. PCT/IT1999/000427
International Filing Date 29.12.1999
Chapter 2 Demand Filed 19.07.2000
IPC
H01M 6/04 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
04Cells with aqueous electrolyte
H01M 6/32 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
30Deferred-action cells
32activated through external addition of electrolyte or of electrolyte components
H01M 6/34 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
30Deferred-action cells
32activated through external addition of electrolyte or of electrolyte components
34Immersion cells, e.g. sea-water cells
H01M 6/50 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
50Methods or arrangements for servicing or maintenance, e.g. maintaining operating temperature
CPC
H01M 6/045
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
04Cells with aqueous electrolyte
045characterised by aqueous electrolyte
H01M 6/32
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
30Deferred-action cells
32activated through external addition of electrolyte or of electrolyte components
H01M 6/34
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
30Deferred-action cells
32activated through external addition of electrolyte or of electrolyte components
34Immersion cells, e.g. sea-water cells
H01M 6/5077
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
6Primary cells; Manufacture thereof
50Methods or arrangements for servicing or maintenance, e.g. maintaining operating temperature
5077Regeneration of reactants or electrolyte
Applicants
  • CONSIGLIO NAZIONALE DELLE RICERCHE [IT/IT]; Piazzale Aldo Moro, 7 I-00185 Roma, IT (AllExceptUS)
  • A.L.A. ELETTRONICA S.R.L. also known as ALA ELETTRONICA S.R.L. [IT/IT]; Via della Maggiona, 5 I-00040 Pomezia, IT (AllExceptUS)
  • ZOCCHI, Fernando [IT/IT]; IT (UsOnly)
Inventors
  • ZOCCHI, Fernando; IT
Agents
  • BORRINI, Stefano ; Società Italiana Brevetti S.p.A. Piazza di Pietra, 39 I-00186 Roma, IT
Priority Data
RM98A00081129.12.1998IT
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) WATER-ACTIVATED PRIMARY BATTERY PARTICULARLY SUITABLE FOR ENVIRONMENTALLY SAFE UNDERWATER USE
(FR) PILE PRIMAIRE HYDRAULIQUE ECOLOGIQUE UTILISABLE EN PARTICULIER SOUS L'EAU
Abstract
(EN)
A water-activated primary battery using magnesium or alloys thereof as the anode and a cathode of various material having a redox potential allowing a charge transfer reaction is described, said battery comprising one or more electrochemical cells enclosed in a casing (1), characterised in that it contains a pH buffer system formed by at least one acid having an ionization constant Ka $m(F) 0.1 moles/litre, in order to maintain in the electrolytic solution the concentration of the hydroxyl ions yielded by the reaction Mg + 2 H2O $m(7) Mg2+ + 2OH- + H2$m(6) below the threshold value that causes the Mg(OH)2 precipitation, said precipitation being also provoked by the increase of the Mg2+ concentration due to the anodic reaction Mg $m(7) Mg2+ + 2 e thereby avoiding the deposition of Mg(OH)2 on the cathode with the consequent decrease of the voltage output from said battery.
(FR)
L'invention concerne une pile primaire hydraulique utilisant du magnésium ou des alliages de celui-ci, cette pile étant munie d'une anode et une cathode fabriquées dans différents matériaux présentant un potentiel d'oxydoréduction qui permet une réaction de transfert de charge. Cette pile renferme par ailleurs une ou plusieurs cellules électrochimique enfermées dans un boîtier (1), de sorte que cette pile contient un système tampon pH formé par au moins un acide dont la constante d'ionisation Ka est inférieure ou égale à 0,1 moles par litre, ce qui permet de maintenir, dans la solution électrolytique, la concentration des ions hydroxyles produits par la réaction Mg + 2 H2O $m(7) Mg2+ + 2OH- + H2$m(6) en-deçà de la valeur seuil provoquant une précipitation de Mg(OH)2. Cette précipitation est également due à l'augmentation de la concentration de Mg2+ faisant suite à la réaction anodique Mg $m(7) Mg2+ + 2 e. On évite ainsi toute formation d'un dépôt de Mg(OH)2 sur la cathode, ce qui fait baisser la sortie en tension de ladite pile.
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