US 7,537,861 B2
	Lithium secondary battery employing fluorine-substituted cyclohexylbenzene containing electrolytic solution
Koji Abe, Yamaguchi (Japan); Takashi Hattori, Yamaguchi (Japan); Takaaki Kuwata, Yamaguchi (Japan); and Yasuo Matsumori, Yamaguchi (Japan)
Assigned to UBE Industries, Ltd., Ube-Shi, Yamaguchi (Japan)
Appl. No. 10/521,797 PCT Filed Jul. 31, 2003, PCT No. PCT/JP03/09739 § 371(c)(1), (2), (4) Date Jan. 21, 2005, PCT Pub. No. WO2004/012295, PCT Pub. Date Feb. 05, 2004.
Claims priority of application No. 2002-222510 (JP), filed on Jul. 31, 2002.
Prior Publication US 2005/0250007 A1, Nov. 10, 2005
Int. Cl. H01M 10/40 (2006.01)

U.S. Cl. 429—199  [429/200; 429/326; 429/330; 429/331]

7 Claims

1. A lithium secondary battery comprising a positive electrode, a negative electrode of artificial graphite or natural graphite and a nonaqueous electrolytic solution having an electrolyte dissolved in a nonaqueous solvent, wherein 0.2 to 10 wt. % of a cyclohexylbenzene having a flourine atom bonded to a benzene ring thereof is contained in the nonaqueous electrolytic solution.