Cathode active material for lithium secondary batteries and...

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H01M 4/131 (2010.01) H01M 4/1391 (2010.01) H01M 10/0525 (2010.01) H01M 4/04 (2006.01) H01M 4/48 (2010.01) H01M 10/36 (2006.01)

Patent

CA 2678591

The present invention relates to a cathode active material for lithium secondary batteries with high safety, a method of preparing the same and lithium secondary batteries comprising the same. The cathode active material of the present invention comprises a lithium metal oxide secondary particle core portion formed by aggregation of lithium metal oxide primary particles; and a shell portion formed by coating the secondary particle core portion with an olivine - structured lithium iron phosphate oxide. The cathode active material of the present invention allows to manufacture lithium secondary batteries with improved safety, especially overcharge characteristics.

La présente invention concerne un matériau actif pour cathode de batteries secondaires au lithium à haute sécurité, un procédé pour sa préparation et des batteries secondaires au lithium qui le contiennent. Le matériau actif pour cathode selon la présente invention comprend une partie d'âme en particules secondaires d'oxyde métallique de lithium formée par agrégation de particules primaires d'oxyde métallique de lithium et une partie d'enveloppe formée en revêtant la partie d'âme en particules secondaires d'un oxyde de phosphate de fer et de lithium à structure d'olivine. Le matériau actif pour cathode selon la présente invention permet de fabriquer des batteries secondaires au lithium dont les caractéristiques de sécurité, et en particulier en surcharge, sont améliorées.

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