Electrolytic solution

Patent metadata

Field	Value
Publication number	US-9455474-B2
Application number	US-201214008350-A
Country	US
Kind code	B2
Filing date	Apr 2, 2012
Priority date	Mar 31, 2011
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

Provided is an electrolytic solution exhibiting excellent withstand voltage and satisfactory characteristics even at low and high temperatures. The invention is an electrolytic solution that includes a cyclic carbonate (I-1) represented by formula (I-1):

(in the formula, R is an alkyl group having two or more carbon atoms, a fluorine-containing alkyl group having two or more carbon atoms, an alkoxy group or a fluorine-containing alkoxy group, in which an oxygen atom may be inserted between carbon atoms); a cyclic carbonate (I-2) different from the cyclic carbonate (I-1); and an electrolyte salt (II)).

First claim

The invention claimed is:

1. An electrolytic solution, comprising:
a cyclic carbonate (I-1) represented by formula (I-1):

(in the formula, R is a fluorine-containing ether group (Ia) having two or more carbon atoms, a fluorine-containing alkoxy group (Ib), or a fluorine-containing alkyl group (Ic) having two or more carbon atoms);
a cyclic carbonate (I-2) different from the cyclic carbonate (I-1)); and
an electrolyte salt (II),
wherein volume percent of the cyclic carbonate (I-1) ranges from 0.2 to 8.0,
wherein the fluorine-containing alkyl group (Ic) is —CH 2 CF(CF 3 ) 2 ,—CH 2 CF 2 H, —CH 2 CF 2 CF 3 , —CH 2 CF 2 CF 2 H, —CH 2 CF 2 CFH 2 , —CH 2 CF 2 CH 3 or —CH 2 CH(CF 3 )CF 3 ,
wherein the fluorine-containing ether group (Ia) is represented by formula (Ia-1):

(in the formula, R 1 is an alkyl group optionally having a fluorine atom; R 2 is an alkylene group optionally having a fluorine atom; n1 is an integer from 1 to 3; and at least one of R 1 and R 2 has a fluorine atom), and
wherein the fluorine-containing alkoxy group (Ib) is represented by formula (2):
X 2 3 C—(R 5 ) n4 —O—  (2)

(the three X 2 are identical or dissimilar and each is H or F; R 5 is C1 to C5 alkylene group optionally having a fluorine atom: and n4 is 0 or 1, such that any one of the three X 2 comprises a fluorine atom).

2. The electrolytic solution according to claim 1 , comprising a linear carbonate (I-3).

3. The electrolytic solution according to claim 2 , wherein a volume ratio of cyclic carbonate (I-1) to cyclic carbonate (I-2) to linear carbonate (I-3) is 0.5-8.0: 10.0-92.0: 0-89.5.

4. The electrolytic solution according to claim 1 , wherein the fluorine content of R in formula (I-1) ranges from 10 to 76 mass %.

5. The electrolytic solution according to claim 1 , wherein the cyclic carbonate (I-2) is at least one cyclic carbonate selected from the group consisting of ethylene carbonate, propylene carbonate, fluoroethylene carbonate and vinylene carbonate.

Assignees

• Koh Meiten
• Sakata Hideo
• Nakazawa Hitomi
• Sanagi Tomoyo
• Sawaki Kyouhei
• Yamauchi Akiyoshi
• Nakazono Aoi
• Adachi Yuki
• Daikin Ind Ltd

Inventors

• Koh Meiten
• Sakata Hideo
• Nakazawa Hitomi
• Sanagi Tomoyo
• Sawaki Kyouhei
• Yamauchi Akiyoshi
• Nakazono Aoi
• Adachi Yuki

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01G11/64

  characterised by additives · CPC title

• H01G11/58

  Liquid electrolytes · CPC title

• H01G11/62

  characterised by the solute, e.g. salts, anions or cations therein · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title