Low temperature li/fes2 battery

H - Electricity – 01 – M

Patent

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Details

H01M 4/02 (2006.01) H01M 6/16 (2006.01) H01M 4/58 (2006.01) H01M 10/36 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2577946

The invention is an electrochemical battery cell, particularly a Li/FeS2 cell, with a nonaqueous electrolyte. The electrolyte has LiI as a primary solute and a solvent including a relatively high level (45 to 80 volume percent) of 1,2- dimethoxyethane and a limited amount (5 to 35 volume percent) of 3-methyl-2- oxazolidinone. The inclusion of 3-methyl-2-oxazolidinone in the electrolyte provides an electrochemical cell which is economical to produce and has good discharge characteristics at room temperature, particularly on high rate and high power discharge, while also providing useful capacity at low temperatures.

L'invention concerne une cellule de batterie électrochimique, en particulier une cellule contenant Li/FeS2, comprenant un électrolyte non aqueux. Ledit électrolyte comprend du LiI comme premier soluté et un solvant présentant une teneur relativement élevée (45 à 80 pour cent en volume) de 1,2-diméthoxyméthane et une quantité limitée (5 à 35 pour cent en volume) de 3-méthyl-2-oxazolidinone. L'inclusion du 3-méthyl-2-oxazolidinone dans l'électrolyte produit une cellule électrochimique qui est économique à produire et qui présente de bonnes caractéristiques de décharge à température ambiante, en particulier une décharge à débit élevé et de forte puissance, tout en conservant sa capacité utile à des températures faibles.

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