US 11,855,259 B2
Electrolyte for lithium secondary battery and lithium secondary battery comprising same
Hee Cheol Kim, Cheonan-si (KR); Younggil Kwon, Daejeon (KR); Eui Hyeong Hwang, Daejeon (KR); Ji Hee Jang, Daejeon (KR); Sang Ho Lee, Daejeon (KR); Seung Wan Song, Sejong (KR); and Quang Hieu Pham, Würenlingen (CH)
Assigned to RENEWABLE ENERGY PLATFORM CO., LTD., Chungcheongnam-Do (KR); and THE INDUSTRY & ACADEMIC COOPERATION IN CHUNGNAM NATIONAL UNIVERSITY, Daejeon (KR)
Appl. No. 16/640,912
Filed by RENEWABLE ENERGY PLATFORM CO., LTD., Chungcheongnam-do (KR); and THE INDUSTRY & ACADEMIC COOPERATION IN CHUNGNAM NATIONAL UNIVERSITY, Daejeon (KR)
PCT Filed Jul. 31, 2018, PCT No. PCT/KR2018/008729
§ 371(c)(1), (2) Date Feb. 21, 2020,
PCT Pub. No. WO2019/039763, PCT Pub. Date Feb. 28, 2019.
Claims priority of application No. 10-2017-0106261 (KR), filed on Aug. 22, 2017.
Prior Publication US 2021/0135285 A1, May 6, 2021
Int. Cl. H01M 10/0567 (2010.01); H01M 10/0568 (2010.01); H01M 10/0525 (2010.01); H01M 10/42 (2006.01)
CPC H01M 10/0567 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/4235 (2013.01); H01M 2300/0025 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A flame retardant lithium secondary battery electrolyte comprising at least one compound of a fluoro carbonate compound represented by the following chemical formula 1 or a fluoro ester compound represented by the following chemical formula 2, and further comprising a cyclic carbonate compound represented by the following chemical formula 3, and a lithium salt including any one or mixtures of two or more selected from the group consisting of LiPF6, LiClO4, LiAsF6, LiBF4, LiSbF6, LiAlO4, LiAlCl4, LiCF3SO3, LiC4F9SO3, LiN(C2F5SO3)2, LiN(C2F5SO2)2, LiN(CF3SO2)2, LiN(CxF2x+1SO2)(CyF2y+1SO2)(provided that x and y are 0 or natural number), LiCl, LiI, LiSCN, LiB(C2O4)2, LiF2BC2O4, LiPF4(C2O4), LiPF2(C2O4)2, and LiP(C2O4)3:

OG Complex Work Unit Chemistry
In chemical formula 1, R1 and R2 are each independently hydrogen, fluoro or CHxF(3-x) (x is 0, 1, 2, or 3), hydrogens connected to the carbon Ca and carbon Cb can be independently substituted with fluoro, an C1-C3 alkyl group, or a C1-C3 fluoroalkyl group, and n is 1, 2, or 3, and includes at least one fluoro;

OG Complex Work Unit Chemistry
In chemical formula 2, R1 is hydrogen, R2 is hydrogen, fluoro or CHxF(3-x) (x is 0, 1, 2, or 3), n of Ca is 1, hydrogens connected to the carbon Cb are each independently substituted with fluoro, an C1-C3 alkyl group, or a C1-C3 fluoroalkyl group, and n of Cb is 1, 2, or 3, and includes at least one fluoro; and

OG Complex Work Unit Chemistry
In chemical formula 3, R1 and R2 are each independently hydrogen or a C1-C4 alkyl group,
wherein, when the flame retardant lithium secondary battery electrolyte comprises the fluoro carbonate compound represented by the above-mentioned chemical formula 1 and the cyclic carbonate compound represented by the above-mentioned chemical formula 3, the fluoro carbonate compound represented by the above-mentioned chemical formula 1 and the cyclic carbonate compound represented by the above-mentioned chemical formula 3 are mixed at a volume ratio of 0.5:9.5 to 9.5:0.5,
when the flame retardant lithium secondary battery electrolyte comprises the fluoro ester compound represented by the above-mentioned chemical formula 2 and the cyclic carbonate compound represented by the above-mentioned chemical formula 3, the fluoro ester compound represented by the above-mentioned chemical formula 2 and the cyclic carbonate compound represented by the above-mentioned chemical formula 3 are mixed at a volume ratio of 0.5:9.5 to 9.5:0.5.