US 7,541,114 B2
Anode active material, manufacturing method thereof, and non-aqueous electrolyte secondary battery
Tsutomu Ohzuku, Nara (Japan); Hiroshi Yoshizawa, Hirakata (Japan); Masatoshi Nagayama, Hirakata (Japan); and Hizuru Koshina, Neyagawa (Japan)
Assigned to Panasonic Corporation, Osaka (Japan); and Osaka City University, Osaka (Japan)
Appl. No. 10/506,298
PCT Filed Feb. 24, 2003, PCT No. PCT/JP03/01997
§ 371(c)(1), (2), (4) Date Sep. 01, 2004,
PCT Pub. No. WO03/075376, PCT Pub. Date Sep. 12, 2003.
Claims priority of application No. 2002-056480 (JP), filed on Mar. 01, 2002; and application No. 2002-129134 (JP), filed on Apr. 30, 2002.
Prior Publication US 2005/0170250 A1, Aug. 04, 2005
Int. Cl. H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/48 (2006.01); H01M 4/50 (2006.01); H01M 4/52 (2006.01)
U.S. Cl. 429—322  [429/218.1; 429/224; 429/231.95] 24 Claims
OG exemplary drawing
 
1. A positive electrode active material represented by the composition formula: Li2±α[Me]4O8−x, wherein 0≤α<0.4, 0≤x<2, and Me is a transition metal containing Mn and at least one selected from the group consisting of Ni, Cr, Fe, Co and Cu, said active material exhibiting first and second topotactic two-phase reactions respectively during first and second stages of charge and discharge, and characterized in that the phase of the transition metal has a 2×2 superlattice.