Method of judging the propriety of a positive electrode...

Details Method of judging the propriety of a positive electrode... Method of judging the propriety of a positive electrode...

2008-11-26

2009-12-29

Crepeau, Jonathan (Department: 1795)

Data processing: structural design, modeling, simulation, and em

Simulating nonelectrical device or system

Chemical

C702S082000, C423S594400, C423S594600, C429S231300

Reexamination Certificate

active

07640150

ABSTRACT:
An electrode material for a lithium secondary battery which includes particles each having a central portion and a surface portion covering the surface of the central portion. The central portion occupies 80 to 99% of a distance from a center to an outermost surface of the particle and the surface portion occupies 20 to 1% of the distance. The central portion includes LiM1-aDaO2(M represents Co or Ni, D represents a transition metal element or Al replacing a part of Co or Ni as M, and M is not the same as D) having an α-NaFeO2structure. The surface portion includes LiM1-bEbO2(M represents Co or Ni, E represents a metal element replacing a part of Co or Ni as M, and M is not the same as E) having an α-NaFeO2structure. The content of element E in the central portion satisfies the relation of E/(M+D+E)<0.05 in terms of an atomic ratio, and the content of element D in the surface portion satisfies the relation of D/(M+D+E)<0.05 in terms of an atomic ratio.

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