Additive composition for lithium battery electrolyte, organic electrolyte including the same, and lithium battery including the additive composition

Patent metadata

Field	Value
Publication number	US-2018083317-A1
Application number	US-201715708728-A
Country	US
Kind code	A1
Filing date	Sep 19, 2017
Priority date	Sep 20, 2016
Publication date	Mar 22, 2018
Grant date	—

Abstract

Provided is an additive composition for a lithium battery electrolyte, the additive composition including a first compound represented by Formula 1 and a second compound represented by Formula 2:

Also provided are an organic electrolyte including the additive composition, and a battery including the organic electrolyte.

First claim

What is claimed is:

1 . An additive composition for a lithium battery electrolyte, comprising a first compound represented by Formula 1 and a second compound represented by Formula 2:

wherein, in Formulae 1 and 2,
R 1 to R 10 are each independently hydrogen; a halogen atom; a C 1 -C 5 alkyl group; a C 1 -C 5 alkyl group substituted with a halogen atom; a C 2 -C 5 alkenyl group; a C 2 -C 5 alkenyl group substituted with a halogen atom; a C 2 -C 5 alkynyl group; a C 2 -C 5 alkynyl group substituted with a halogen atom; a C 4 -C 10 cycloalkyl group; a C 4 -C 10 cycloalkyl group substituted with a halogen atom; a C 5 -C 10 aryl group; or a C 5 -C 10 aryl group substituted with a halogen atom, provided that at least one of R 1 to R 5 is a halogen atom, and at least one of R 6 to R 10 is a halogen atom, and
a composition ratio of the first compound to the second compound is in a range of about 1:2 to about 1:4 based on the total weight of the additive composition.

2 . The additive composition as claimed in claim 1 , wherein the composition ratio of the first compound to the second compound is in a range of about 1:2 to about 1:3 based on the total weight of the additive composition.

3 . The additive composition as claimed in claim 1 , wherein R 1 to R 10 in Formulae 1 and 2 are each independently hydrogen; a halogen atom; a methyl group; an ethyl group; a propyl group an isopropyl group; a butyl group; an isobutyl group; a tert-butyl group; or a pentyl group, provided that at least one of R 1 to R 5 is a halogen atom, and at least one of R 6 to R 10 is a halogen atom.

4 . The additive composition as claimed in claim 1 , wherein at least one of R 1 to R 5 in Formula 1 is fluorine, and at least one of R 6 to R 10 in Formula 2 is fluorine.

5 . The additive composition as claimed in claim 1 , wherein the first compound includes one or more of 1-fluoro-2-cyclohexylbenzene, 1-fluoro-3-cyclohexylbenzene, or 1-fluoro-4-cyclohexylbenzene, and the second compound includes one or more of 1-fluoro-2-phenylbenzene, 1-fluoro-3-phenylbenzene, or 1-fluoro-4-phenylbenzene.

6 . The additive composition as claimed in claim 1 , wherein the first compound and the second compound in the additive composition decompose at a voltage in a range of about 4.7 V to about 4.8 V.

7 . An organic electrolyte comprising:
a lithium salt; an organic solvent; and the additive composition as claimed in claim 1 .

8 . The organic electrolyte as claimed in claim 7 , wherein an amount of the additive composition is in a range of about 2.5 wt % to about 4 wt % based on the total weight of the organic electrolyte.

9 . The organic electrolyte as claimed in claim 7 , wherein an amount of the first compound is in a range of about 0.5 wt % to about 2 wt % based on the total weight of the organic electrolyte.

10 . The organic electrolyte as claimed in claim 7 , wherein an amount of the second compound is in a range of about 2 wt % to about 3.5 wt % based on the total weight of the organic electrolyte.

11 . The organic electrolyte as claimed in claim 7 , wherein:
a composition ratio of the first compound to the second compound in the additive composition is in a range of about 1:2 to about 1:4 based on the total weight of the additive composition, and an amount of the additive composition is in a range of about 2.5 wt % to about 4 wt % based on the total weight of the organic electrolyte.

12 . The organic electrolyte as claimed in claim 7 , wherein the lithium salt includes one or more of LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiAlO 2 , LiAlCl 4 , LiN(C x F 2x+1 SO 2 )(C y F 2y+1 SO 2 )(2≦x≦20, 2≦y≦20), LiCl, or LiI.

13 . The organic electrolyte as claimed in claim 7 , wherein a concentration of the lithium salt in the electrolyte is in a range of about 0.01 M to about 2.0 M.

14 . The organic electrolyte as claimed in claim 7 , wherein the organic solvent includes one or more of a diallylcarbonate, a cyclic carbonate, a linear or cyclic ester, a linear or cyclic amide, an aliphatic nitrile, or a linear or cyclic ether, or a derivative thereof.

15 . A lithium battery comprising:
a positive electrode; a negative electrode; and the organic electrolyte as claimed in claim 7 .

16 . The lithium battery as claimed in claim 15 , wherein the lithium battery has a voltage of at least 3.8 V.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Sejeong
• Yang Hoseok
• Koh Sujeong
• Kim Yunhee
• Kim Hyunwoo
• Lee Minyoung
• Hwang Heeyeon

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title