Liquid electrolyte lithium-sulfur batteries

H - Electricity – 01 – M

Patent

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Details

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

Patent

CA 2399591

A high performance lithium-sulfur battery cell (10) includes the following features: (a) a negative electrode (14) including a metal or an ion of the metal; (b) a positive electrode (18) comprising an electronically conductive material; and (c) a liquid catholyte (16) including a solvent and a dissolved electrochemically active material comprising sulfur in the form of a sulfide of the negative electrode metal or a polysulfide of the metal. Such battery cells are characterized by an energy density, calculated based upon a laminate weight, of at least 400 Watt-hours/kilogram when discharged at a rate of at least 0.1 mA/cm2. Cells meeting these criteria often find use as primary cells.

La présente invention concerne un cellule de batterie d'accumulateur au soufre-lithium (10) à haut rendement comportant les éléments suivants: (a) une électrode négative (14) comportant un métal ou un ion dudit métal; (b) une électrode positive (18) comprenant un matériau à conduction électronique; et (c) un catholyte liquide (16) contenant un solvant et un matériau actif en solution électrochimique comprenant du soufre sous la forme d'un sulfure d'un métal de l'électrode négative ou d'un polysulfure dudit métal. Lesdites cellules de batterie d'accumulateur sont caractérisées par une intensité d'énergie, calculée sur la base du poids des couches, d'au moins 400 wattheures/kilogramme lorsqu'elle est déchargée à un taux d'au moins 0,1 mA/cm?2¿. Les cellules présentant ces critères sont souvent utilisables en tant que cellules primaires.

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