Redox material for cathodes in non-aqueous batteries

Details Redox material for cathodes in non-aqueous batteries Redox material for cathodes in non-aqueous batteries

H - Electricity

01

M

H01M 4/36 (2006.01) H01M 4/60 (2006.01) H01M 10/40 (2006.01) H01M 4/02 (2006.01)

Patent

CA 2394226

A cathode material featuring PVM for use in rechargeable electrochemical cells. It has been discovered that the polymer backbone of PVM, which consists solely of carbon atoms, is not subject to scission during repeated charge- discharge cycles, such that the cathode material remains substantially insoluble in standard liquid electrolytes. As a result, cells containing PVM as the cathode material and liquid electrolyte are genuinely electrochemically reversible. The use of PVM overcomes the problems associated with organosulfides of the background art, with which dissolution of anions in the liquid electrolyte during discharging results in migration from the cathode and contamination of the anode/electrolyte surface and ultimately leads to degradation of the electrolyte and/or deterioration of the anode-electrolyte interface.

L'invention concerne un matériel cathodique contenant un PVM qui s'utilise dans des cellules électrochimiques rechargeables. Selon l'invention, le squelette polymère du PVM, uniquement constitué d'atomes de carbone, ne subit pas de rupture pendant les cycles répétés de charge-décharge, si bien que le matériel cathodique demeure sensiblement insoluble dans des électrolytes liquides normaux. Il en résulte que les cellules contenant le PVM (en tant que matériel cathodique) et l'électrolyte liquide sont véritablement réversibles par procédé électrochimique. L'emploi du PVM élimine les problèmes liés à l'usage d'organosulfures dans la technique antérieure, lequel usage entraîne la dissolution d'anions dans l'électrolyte liquide pendant la décharge, ce qui provoque une migration de la cathode et la contamination de la surface anode-électrolyte aboutissant à la dégradation de l'électrolyte et/ou à la détérioration de l'interface anode-electrolyte.

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