US 9,812,709 B2
Lithium secondary battery, positive electrode active material, positive electrode, electric tool, electric vehicle, and power storage system
Kazuaki Endoh, Fukushima (JP); Akira Takamuku, Fukushima (JP); Masaharu Senoue, Fukushima (JP); Guohua Li, Saitama (JP); Kenichi Kawase, Fukushima (JP); and Yosuke Hosoya, Fukushima (JP)
Assigned to SONY CORPORATION, Tokyo (JP)
Filed by Kazuaki Endoh, Fukushima (JP); Akira Takamuku, Fukushima (JP); Masaharu Senoue, Fukushima (JP); Guohua Li, Saitama (JP); Kenichi Kawase, Fukushima (JP); and Yosuke Hosoya, Fukushima (JP)
Filed on Dec. 14, 2011, as Appl. No. 13/326,018.
Claims priority of application No. 2010-293268 (JP), filed on Dec. 28, 2010.
Prior Publication US 2012/0164525 A1, Jun. 28, 2012
Int. Cl. H01M 4/52 (2010.01); H01M 4/525 (2010.01); H01M 4/485 (2010.01); H01M 4/131 (2010.01); H01M 10/0525 (2010.01); H01M 4/36 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 10/0525 (2013.01); Y02E 60/122 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A lithium secondary battery, comprising:
a positive electrode;
a negative electrode; and
an electrolyte solution,
wherein the positive electrode comprises a positive electrode active material that comprises an element M2 incorporated in a crystal structure in a surface layer area of a complex oxide,
wherein the element M2 is carbon,
wherein the complex oxide comprises an element M1 and is represented by formula (1):
Li1+a(MnbCocNi1−b−c)1−aM1dO2−e  (1),
wherein the element M1 is at least one of aluminum, magnesium, zirconium, titanium, barium, boron, silicon, or iron, and
wherein a satisfies 0<a<0.25, b satisfies 0.5≤b<0.7, c satisfies 0≤c<1−b, d satisfies 0.01≤d≤0.2, and e satisfies 0≤e≤1.