US 9,812,735 B2
Lithium ion secondary battery
Masaru Heishi, Tsukuba (JP); Takuya Toyokawa, Tsukuba (JP); Katsumi Maeda, Tokyo (JP); Noriyuki Tamura, Tokyo (JP); and Kentaro Nakahara, Tokyo (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP); and NEC CORPORATION, Tokyo (JP)
Appl. No. 14/772,595
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP); and NEC CORPORATION, Tokyo (JP)
PCT Filed Aug. 20, 2014, PCT No. PCT/JP2014/071747
§ 371(c)(1), (2) Date Sep. 3, 2015,
PCT Pub. No. WO2015/025877, PCT Pub. Date Feb. 26, 2015.
Claims priority of application No. 2013-171606 (JP), filed on Aug. 21, 2013.
Prior Publication US 2016/0028119 A1, Jan. 28, 2016
Int. Cl. H01M 10/05 (2010.01); H01M 4/50 (2010.01); H01M 10/0567 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01); H01M 10/0569 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 10/0567 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); H01M 2300/0025 (2013.01); Y02T 10/7011 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A lithium ion secondary battery comprising: a positive electrode comprising a positive electrode active material; a negative electrode comprised mainly of a material capable of storing and releasing lithium ions; and an electrolytic liquid, the positive electrode active material being a lithium-iron-manganese complex oxide having a layered rock salt structure and represented by a chemical formula:
LixFesM1(z-s)M2yO2-δ
wherein 1.05≤x≤1.32, 0.06≤s≤0.50, 0.06≤z≤0.50, 0.33≤y≤0.63, and 0≤δ≤0.80; M1 represents a metal selected from the group consisting of Co, Ni, Mn and a mixture thereof; and M2 represents a metal selected from the group consisting of Mn, Ti, Zr and a mixture thereof,
the electrolytic liquid comprising 1,1,2,3,3,3-hexafluoropropyl difluoromethyl ether represented by the following formula (1):

OG Complex Work Unit Drawing