Active material of positive electrode for non-aqueous...

H - Electricity – 01 – M

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H01M 4/58 (2006.01) C01G 51/00 (2006.01) H01M 4/02 (2006.01) H01M 4/52 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2325467

An active material of a positive electrode for a non-aqueous electrode secondary battery employing lithium cobaltate represented by the formula LiCoO2, which comprises a mixture of primary particles of small crystals having a Feret's diameter in a projection drawing by SEM observation in a range from 0.4 to 10 µm and an average diameter of 5 µm or less, and secondary particles formed by coagulation of the primary particles and having a diameter of 4 to 30 µm, wherein the mole ratio of Co to Li is 0.97 to 1.03, at least a part of small crystals constituting the secondary particles are jointed by the junction through sintering, and the secondary particles are in the shape of a circle or an ellipse. And also are provided an active material of a positive electrode for a non-aqueous electrode secondary battery, wherein secondary particles account for 90% or more of the particles having a Feret's diameter of 9 µm or more and particles having a Feret's diameter of 6 µm or more constitute 70% or more by volume of the total mixture, which allows the improvement of discharge capacity, capability of keeping the level of discharge capacity, and high efficiency discharge capacity and a method for the production thereof, and a non-aqueous electrode secondary battery manufactured using the active material of a positive electrode.

L'invention porte sur un matériau actif pour électrode positive non aqueuse d'accumulateur composé de cobaltate de lithium de formule LiCoO¿2? et consistant en un mélange de particules primaires de petits cristaux d'un diamètre de Feret, vu sur une projection obtenue par MEB, compris entre 0,4 et 10 µm et d'un diamètre moyen de 5 µm ou moins, et de particules secondaires formées par coagulation des particules primaires et présentant un diamètre moyen de 4 à 30 µm, le rapport molaire Co/Li étant compris entre 0,97 et 1,03, une partie au moins des petits cristaux constitutifs des particules secondaires étant réunis par frittage, et les particules secondaires étant circulaires ou elliptiques. L'invention porte également sur un matériau actif pour électrode positive non aqueuse d'accumulateur, où les particules secondaires représentent 90 % ou plus des particules d'un diamètre de Feret de 9 µm ou plus et où les particules d'un diamètre de Feret de 6 µm ou plus représentent 70 % ou plus du volume total du mélange. Ces caractéristiques améliorent la capacité de décharge, la capacité à maintenir la capacité de décharge, et le rendement de la capacité de décharge. L'invention porte en outre sur le procédé de production dudit matériau, et sur des accumulateurs à électrode non aqueuse fabriqués au moyen de ce matériau pour électrode positive.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Active material of positive electrode for non-aqueous... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active material of positive electrode for non-aqueous..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active material of positive electrode for non-aqueous... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1574960

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.