Electrolytic solution, electrochemical device, lithium-ion secondary cell, and module

Patent metadata

Field	Value
Publication number	US-10978742-B2
Application number	US-201716470609-A
Country	US
Kind code	B2
Filing date	Nov 21, 2017
Priority date	Dec 27, 2016
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

An electrolyte solution applicable to high-voltage electrochemical devices and capable of improving the cycle characteristics of electrochemical devices even at high voltage. The electrolyte solution contains a fluorinated acyclic carbonate and a metal salt having a specific structure. The fluorinated acyclic carbonate is represented by CF3—OCOO—R11 (wherein R11 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group) or CFH2—OCOO—R12 (wherein R12 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group).

First claim

The invention claimed is:

1. An electrolyte solution comprising:
a solvent; and
a compound (2),
the solvent containing at least one fluorinated acyclic carbonate (1) selected from the group consisting of:
a compound represented by the following formula:

wherein R 11 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group; and
a compound represented by the following formula:

wherein R 12 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group,
the compound (2) being represented by the following formula (2):

wherein
A a+ is a metal ion, a hydrogen ion, or an onium ion;
a is an integer of 1 to 3;
b is an integer of 1 to 3;
p is b/a;
n 23 is an integer of 1 to 4;
n 21 is an integer of 0 to 8;
n 22 is 0 or 1;
Z 21 is a transition metal or an element in group III, group IV, or group V of the Periodic Table;
X 21 is O, S, a C1-C10 alkylene group, a C1-C10 halogenated alkylene group, a C6-C20 arylene group, or a C6-C20 halogenated arylene group, with the alkylene group, the halogenated alkylene group, the arylene group, and the halogenated arylene group each optionally containing a substituent and/or a hetero atom in the structure thereof, and when n 22 is 1 and n 23 is 2 to 4, n 23 X 21 s optionally bind to each other;
L 21 is a halogen atom, a cyano group, a C1-C10 alkyl group, a C1-C10 halogenated alkyl group, a C6-C20 aryl group, a C6-C20 halogenated aryl group, or —Z 23 Y 23 , with the alkylene group, the halogenated alkylene group, the arylene group, and the halogenated arylene group each optionally containing a substituent and/or a hetero atom in the structure thereof, and when n 21 is 2 to 8, n 21 L 21 s optionally bind to each other to form a ring;
Y 21 , Y 22 , and Z 23 are each individually O, S, NY 24 , a hydrocarbon group, or a fluorinated hydrocarbon group;
Y 23 and Y 24 are each individually H, F, a C1-C10 alkyl group, a C1-C10 halogenated alkyl group, a C6-C20 aryl group, or a C6-C20 halogenated aryl group, with the alkyl group, the halogenated alkyl group, the aryl group, and the halogenated aryl group each optionally containing a substituent and/or a hetero atom in the structure thereof, and when multiple Y 23 or multiple Y 24 are present, they optionally bind to each other to form a ring.

2. The electrolyte solution according to claim 1 ,
wherein the solvent contains 11% by volume or more of the fluorinated acyclic carbonate (1).

3. The electrolyte solution according to claim 1 ,
wherein the fluorinated acyclic carbonate (1) is H 2 FC—OCOO—CH 3 .

4. The electrolyte solution according to claim 1 ,
wherein the solvent further contains a fluorinated saturated cyclic carbonate.

5. The electrolyte solution according to claim 4 ,
wherein the solvent contains 11 to 80% by volume of the fluorinated acyclic carbonate (1) and 20 to 89% by volume of the fluorinated saturated cyclic carbonate, and the electrolyte solution contains 0.01 to 10% by mass of the compound (2) relative to the solvent.

6. An electrochemical device comprising the electrolyte solution according to claim 1 .

7. A lithium-ion secondary battery comprising the electrolyte solution according to claim 1 .

8. A module comprising the electrochemical device according to claim 6 .

9. A module comprising the lithium-ion secondary battery according to claim 7 .

Assignees

• Daikin Ind Ltd

Inventors

• Kinoshita Masakazu
• Takahashi Kenzou
• Sakata Hideo
• Yamazaki Shigeaki
• Arima Hiroyuki
• Kinoshita Shinichi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01G11/60

  characterised by the solvent · CPC title

• C01B32/20

  Graphite · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• C01G53/52

  of the type (Mn2O4)2-, e.g. Li2(NixMn2-x)O4 or Li2(MyNixMn2-x-y)O4 · CPC title