US 2015/0311566 A1Published application

Electrolyte and secondary battery

AssigneeSony Corporation

InventorsYuko HAYAKAWA, Tadahiko KUBOTA, Masayuki IHARA

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Abstract

Secondary batteries capable of improving cycle characteristics are provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. A separator provided between the cathode and the anode is impregnated with the electrolytic solution. The electrolytic solution contains a solvent and an electrolyte salt. The solvent contains a cyclic compound having a disulfonic acid anhydride group (—S(═O)2—O—S(═O)2—) and at least one of a nitrile compound. Compared to a case that the solvent does not contain both the cyclic compound having the disulfonic acid anhydride group and succinonitrile or a case that that the solvent contains at least one thereof, chemical stability of the electrolytic solution is improved. Thus, even if charge and discharge are repeated, electrolytic solution decomposition is inhibited.

Claims20

Dependent claims

A secondary battery comprising:

a cathode;
an anode;
and
an electrolyte containing a solvent and an electrolyte salt, wherein the solvent contains at least one type of sulfone compounds expressed by Formula (1) and Formula (2), and at least one of a nitrile compound and compounds expressed by Formula (3) to Formula (4):
where R1 is an alkylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an alkenylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an arylene group or a halogenated group thereof, or a derivative thereof,
where R2 is an alkylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an alkenylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an arylene group or a halogenated group thereof, or a derivative thereof,
[Chemical Formula 3]
R3NCO]a (3)
where R3 is an organic group with “a” valency containing carbon (C) and at least one element of oxygen (O), nitrogen (N), sulfur (S), silicon (Si), phosphorus (P), boron (B), and halogen, and where “a” is one of integer numbers from 1 to 3 both inclusive,
where R4 is an alkyl group with carbon number from 2 to 10 both inclusive, an alkenyl group with carbon number from 2 to 10 both inclusive, a cycloalkyl group, a cycloalkenyl group, an aromatic ring group, a heterocyclic group, or a derivative thereof.

7 more elements

An electrolyte comprising:

a solvent;
and
an electrolyte salt, wherein the solvent contains at least one type of sulfone compounds expressed by Formula (1) and Formula (2), and at least one a nitrile compound and compounds expressed by Formula (3) to Formula (4)
where R1 is an alkylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an alkenylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an arylene group or a halogenated group thereof, or a derivative thereof,
where R2 is an alkylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an alkenylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an arylene group or a halogenated group thereof, or a derivative thereof,
[Chemical Formula 3]
R3NCO]a (3)
where R3 is an organic group with “a” valency containing carbon and at least one element of oxygen, nitrogen, sulfur, silicon, phosphorus, boron, and halogen, where “a” is one of integer numbers from 1 to 3 both inclusive,
where R4 is an alkyl group with carbon number from 2 to 10 both inclusive, an alkenyl group with carbon number from 2 to 10 both inclusive, a cycloalkyl group, a cycloalkenyl group, an aromatic ring group, a heterocyclic group, or a derivative thereof.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/794,426Filed 8 Jul 2015
Priority: JP 2009-07366125 Mar 2009
Published: 29 Oct 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

H01M 10/0569
Liquid materials: characterised by the solvents
H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/134
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/1393
Processes of manufacture: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx

Family

Application13/258,109Continuation · filed 21 Sep 2011
Application14/794,426Continuation
US 2012/0009486 A1Published application
US 9,083,059 B2Related patent
US 9,450,273 B2Related patent
US 2015/0311566 A1This patent

From the US filing history. Foreign family members aren’t listed.