Positive electrode material comprising a phosphate compound...

Details Positive electrode material comprising a phosphate compound... Positive electrode material comprising a phosphate compound...

H - Electricity

01

M

H01M 4/505 (2010.01) H01M 4/131 (2010.01) H01M 10/052 (2010.01) C01B 25/45 (2006.01)

Patent

CA 2396217

The invention provides a positive electrode material and a battery using the same which can achieve a higher discharge voltage and which can obtain excellent charge-and-discharge properties, without reducing the capacity. A positive electrode (12) and a negative electrode (14) are configured through a separator (15) in between. The positive electrode (12) contains a compound expressed by a general formula Li1+xMnyFezPO4 (wherein x, y and z are values within ranges of 0<x<0.1, 0.5<y<0.95, and 0.9<y+z~ 1, respectively). According to the compound, the higher discharge voltage can be obtained due to Mn, the Jahn Teller effect of Mn3+ can be attenuated and furthermore distortion of the crystal structure and the reduction of the capacity can be inhibited due to Fe and the excess Li.

La présente invention concerne un matériau d'anode offrant une tension de décharge élevée et d'excellentes caractéristiques de charge et décharge, sans perte de capacité de l'élément utilisant cette anode. L'invention concerne également un élément de pile comprenant cette anode. L'anode (12) et la cathode (14) s'opposent de part et d'autre d'une séparation (15). L'anode (12) contient un composé représenté par la formule générale Li¿1+x?Mn¿y?Fe¿z?PO¿4? telle que 0<x<0,1, 0,5<y<0,95 et 0,9<y+z<1. La présence du Mn dans le composé confère à l'anode une tension de décharge élevée. L'effet Jahn-Teller imputable au Mn?3+¿ apparaissant à la charge de l'élément est atténué par le Fe et l'excès de Li. On arrive ainsi à faire disparaître la contrainte de la structure du cristal et la diminution de capacité.

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