Nonaqueous electrolyte solution and nonaqueous electrolyte battery employing the same

Patent metadata

Field	Value
Publication number	US-2015140448-A1
Application number	US-201414582676-A
Country	US
Kind code	A1
Filing date	Dec 24, 2014
Priority date	Jun 29, 2012
Publication date	May 21, 2015
Grant date	—

Abstract

Provided is a nonaqueous electrolyte solution battery with dramatically improved battery characteristics. A nonaqueous electrolyte solution battery prepared by using a nonaqueous electrolyte solution comprising (I) an aromatic carboxylic acid ester compound represented by General Formula (1) below; and (II) specific compounds, is improved in charge-discharge characteristics at high current densities, durability performance during high-temperature storage and overcharge characteristics.

(in General Formula (1), A 1 is —R 1 or —OR 1 , with R 1 being an optionally substituted hydrocarbon group with 10 or fewer carbon atoms; A 2 is an optionally substituted aryl group; each of j and k is independently 0 or an integer greater than 0, and at least one of j and k is an integer not less than 1; and when k≧1, A 1 is —OR 1 , while when k=0, A 1 is —R 1 ; and the case of j=1, k=0 is not allowed).

First claim

1 . A nonaqueous electrolyte solution comprising an electrolyte; and a nonaqueous solvent,
the nonaqueous electrolyte solution further comprising: (I) an aromatic carboxylic acid ester compound represented by General Formula (1) below; and (II) at least one kind of compound selected from the group consisting of cyclic carbonate compounds having fluorine atom, monofluorophosphate salts, difluorophosphate salts, borate salts, fluorosulfonate salts, compounds having SO 2 group, compounds having cyano group, compounds having isocyanate group, oxalate salts, Si-containing compounds and aromatic compounds not represented by General Formula (1):

(in General Formula (1), A 1 is —R 1 or —OR 1 , with R 1 being an optionally substituted hydrocarbon group with 10 or fewer carbon atoms; A 2 is an optionally substituted aryl group; each of j and k is independently 0 or an integer greater than 0, and at least one of j and k is an integer not less than 1; and when k≧1, A 1 is —OR 1 , while when k=0, A 1 is —R 1 ; and the case of j=1, k=0 is not allowed).

2 . The nonaqueous electrolyte solution according to claim 1 , wherein the compound of (II) above satisfies at least one of conditions (i) to (vii) below:
(i) the cyclic carbonate having a fluorine atom is a fluorinated ethylene carbonate; (ii) the compound having a SO 2 group is at least one compound selected from the group consisting of chain sulfonic acid esters, cyclic sulfonic acid esters, chain sulfuric acid esters, cyclic sulfuric acid esters, chain sulfurous acid esters and cyclic sulfurous acid esters; (iii) the compound having a cyano group is a compound having at least two cyano groups; (iv) the compound having an isocyanate group is a compound having at least two isocyanate groups; (v) the oxalate salt is a metal salt represented by General Formula (2); (vi) the Si-containing compound is a compound represented by General Formula (3); and (vii) the aromatic compound not represented by General Formula (1) is a halogenated aromatic compound or aromatic hydrocarbon compound,
[C2]
M 1 a [M 2 (C 2 O 4 ) b R c ] d   (2)

(in General Formula (2), M 1 is an element selected from Group 1 and Group 2 elements of the periodic table and aluminum (Al), M 2 is a transition metal or an element selected from Group 13, Group 14 and Group 15 elements of the periodic table, R is a halogen or a group selected from C 1-11 alkyl groups and C 1-31 halogen-substituted alkyl groups, a and b are positive integers, c is 0 or a positive integer, and d is an integer from 1 to 3),

(in General Formula (3), R 5 , R 6 and R 7 represent hydrogen atoms, halogen atoms or hydrocarbon groups with 10 or fewer carbon atoms, and X 3 is an organic group containing at least one atom selected from the group consisting of oxygen, nitrogen and silicon atoms).

3 . The nonaqueous electrolyte solution according to claim 1 , wherein the nonaqueous solvent in the nonaqueous electrolyte solution includes a chain carbonate and a cyclic carbonate that is not a cyclic carbonate having a fluorine atom, and
the total content of the Group (I) compound in the nonaqueous electrolyte solution is 0.001 mass % to 10 mass %, and/or the total content of the Group (II) compound in the nonaqueous electrolyte solution is 0.001 mass % to 20 mass %.

4 . The nonaqueous electrolyte solution according to claim 1 , wherein at least one of j and k is an integer not less than 2 in the General Formula (1).

5 . The nonaqueous electrolyte solution according to claim 1 , further comprising a cyclic carbonate having a carbon-carbon unsaturated bond.

6 . A nonaqueous electrolyte solution battery comprising negative and positive electrodes capable of storing and releasing lithium ions; and a nonaqueous electrolyte solution, wherein the nonaqueous electrolyte solution is the nonaqueous electrolyte solution according to claim 1 .

Assignees

• Mitsubishi Chem Corp

Inventors

• Takiguchi Kanako
• Onuki Masamichi
• Sawa Shuhei

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525 Primary

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

• H01M10/0568

  characterised by the solutes · CPC title

• H01M2300/0034

  Fluorinated solvents · CPC title