Lithium secondary battery

H - Electricity – 01 – M

Patent

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H01M 10/26 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2144107

A lithium secondary battery comprises a negative electrode having lithium as an active material, a positive electrode comprising a boron-containing lithium- manganese composite oxide as an active material and a nonaqueous electrolyte comprising a solute and a solvent, the boron-containing lithium-manganese composite oxide having an atomic ratio between B and Mn (B/Mn) of 0.01 to 0.20 and an average valence of manganese before charge- discharge of at least 3.80, and the solvent being a mixed solvent containing 5 to 50% by volume of a butylene carbonate. This battery is highly reliable, since the positive electrode active material minimally decomposes and hence the internal resistance minimally increases, even when the battery is continuously charged at a high voltage by mistake.

Batterie secondaire au lithium comportant une électrode négative utilisant le lithium comme matière active, une électrode positive utilisant un oxyde composite de lithium-manganèse contenant du bore comme matière active et un électrolyte non aqueux contenant un soluté et un solvant, où le mélange d'oxyde composite de lithium-manganèse contenant du bore présente une proportion de mélange (en nombre d'atomes) de B et de Mn (B/Mn) compris entre 0,01 et 0,20 et une valence moyenne de manganèse avant le cycle de charge-décharge d'au moins 3,80; le solvant, de type mixte, est composé de 5 % à 50 % en volume de carbonate butylène. Du fait de la décomposition minimale de la matière active utilisée dans la fabrication de son électrode positive et de l'augmentation minimale de la résistance interne qui en résulte, cette batterie se distingue par sa haute fiabilité, même dans le cas où, par erreur, elle devait être soumise à un chargement continu sous haute tension.

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