EP0398689A2
Expired / Lapsed
EP
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Nonaqueous electrolyte secondary battery
Assignee: Toshiba Corp
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Filing: 1990-05-16
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Granted: —
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Expires: 2010-05-16
Abstract
Abstract A nonaqueous electrolyte secondary battery comprising a positive electrode (4) housed in a case (1) a negative electrode (6) arranged in the case (1) so that a separator (5) is sandwiched between the positive and negative electrodes (4, 6) consisting of lithium or lithium-containing material, and a nonaqueous electrolyte contained in the case (1) and prepared by dissolving an electrolytic salt consisting of lithium phosphate hexafluoride (LiPF₆) or lithium borofluoride (LiBF₄) in a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and at least one ester-based nonaqueous solvent selected from the group consisting of butylene carbonate, dimethyl carbonate, γ-butyrolactone, and sulfolane.
Inventors
- 👤 Norio C/O Intellectual Property Div. Takami
- 👤 Takahisa C/O Intellectual Property Div. Ohsaki
- 👤 Kuniaki C/O Intellectual Property Div. Inada
- 👤 Norihito C/O Intellectual Property Div. Kurisu
- 👤 Shuji C/O Intellectual Property Div. Yamada
- 👤 Junichi C/O Intellec. Property Div. Takabayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 02:49
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0569; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
91 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) arranged in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) and consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving an electrolytic salt in a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and at least one ester-based nonaqueous solvent selected from the group consisting of butylene carbonate, dimethyl carbonate, γ-butyrolactone, and sulfolane.
Claim 2
Dependent Claim
91 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) arranged in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) and consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving an electrolytic salt in a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and at least one ester-based nonaqueous solvent selected from the group consisting of butylene carbonate, dimethyl carbonate, γ-butyrolactone, and sulfolane.
Claim 3
Dependent Claim
38 words
The secondary battery according to claim 1, characterized in that said lithium-containing material is one element selected from the group consisting of a lithium alloy, carbon-containing lithium ions, conductive polymer-containing lithium ions and a lithiuted transition metal chalcogene.
Claim 4
Dependent Claim
41 words
The secondary battery according to claim 1, characterized in that said solvent mixture has a composition ratio of 20 to 60 vol% of ethylene carbonate, 10 to 50 vol% of 2-methyltetrahydrofuran, and 10 to 50 vol% of said ester-based nonaqueous solvent.
Claim 5
Dependent Claim
22 words
The secondary battery according to claim 1, characterized in that said electrolytic salt is lithium phosphate hexafluoride (LiPF₆) or lithium borofluoride (LiBF₄).
Claim 6
Dependent Claim
91 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) and consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving an electrolytic salt in a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and at least one ether-based nonaqueous solvent selected from the group consisting of tetrahydrofuran, 2-methylfuran, 1,2-dimethoxyethane, diethoxyethane, 1,3-dioxolane, and 1,3-dimethoxypropane.
Claim 7
Dependent Claim
91 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) and consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving an electrolytic salt in a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and at least one ether-based nonaqueous solvent selected from the group consisting of tetrahydrofuran, 2-methylfuran, 1,2-dimethoxyethane, diethoxyethane, 1,3-dioxolane, and 1,3-dimethoxypropane.
Claim 8
Dependent Claim
38 words
The secondary battery according to claim 5, characterized in that said lithium-containing material is one element selected from the group consisting of a lithium alloy, carbon-containing lithium ions, conductive polymer-containing lithium ions and a lithiuted transition metal chalcogene.
Claim 9
Dependent Claim
41 words
The secondary battery according to claim 5, characterized in that said solvent mixture has a composition ratio of 30 to 70 vol% of ethylene carbonate, 10 to 60 vol% of 2-methyltetrahydrofuran, and 0.5 to 30 vol% of said ether-based nonaqueous solvent.
Claim 10
Dependent Claim
44 words
The secondary battery according to claim 5, characterized in that said solvent mixture consists of ethylene carbonate, 2-methyltetrahydrofuran, said ether-based nonaqueous solvent, and at least one ester-based nonaqueous solvent selected from the group consisting of propylene carbonate, butylene carbonate, dimethyl carbonate, γ-butyrolactone, and sulfolane.
Claim 11
Dependent Claim
50 words
The secondary battery according to claim 8, characterized in that said solvent mixture has a composition ratio of 20 to 60 vol% of ethylene carbonate, 10 to 50 vol% of 2-methyltetrahydrofuran, 0.5 to 30 vol% of said ether-based nonaqueous solvent, and 10 to 50 vol% of said ester-based nonaqueous solvent.
Claim 12
Dependent Claim
24 words
The secondary battery according to claim 5 or 8, characterized in that said electrolytic salt is lithium phosphate hexafluoride (LiPF₆) or lithium borofluoride (LiBF₄).
Claim 13
Dependent Claim
108 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in a case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) and consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving 0.1 mol% (inclusive) to 1 mol% (exclusive) of lithium phosphate hexafluoride (LiPF₆) in a solvent mixture consisting of ethylene carbonate and 2-methyltetrahydrofuran or a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and an ether-based nonaqueous solvent selected from the group consisting of tetrahydrofuran, 2-methylfuran, 1,2-dimethoxyethan, diethoxyethane, 1,3-dioxolane, and 1,3-dimethoxypropane.
Claim 14
Dependent Claim
108 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in a case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) and consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving 0.1 mol% (inclusive) to 1 mol% (exclusive) of lithium phosphate hexafluoride (LiPF₆) in a solvent mixture consisting of ethylene carbonate and 2-methyltetrahydrofuran or a solvent mixture consisting of ethylene carbonate, 2-methyltetrahydrofuran, and an ether-based nonaqueous solvent selected from the group consisting of tetrahydrofuran, 2-methylfuran, 1,2-dimethoxyethan, diethoxyethane, 1,3-dioxolane, and 1,3-dimethoxypropane.
Claim 15
Dependent Claim
38 words
The secondary battery according to claim 11, characterized in that said lithium-containing material is one element selected from the group consisting of a lithium alloy, carbon-containing lithium ions, conductive polymer-containing lithium ions and a lithiuted transition metal chalcogene.
Claim 16
Dependent Claim
32 words
The secondary battery according to claim 11, characterized in that said solvent mixture has a composition ratio of 40 to 80 vol% of ethylene carbonate and 20 to 60 vol% of 2-methyltetrahydrofuran.
Claim 17
Dependent Claim
90 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving lithium borofluoride (LiBF₄) in a solvent mixture having a composition ratio of 50 vol% (exclusive) to 80 vol% (inclusive) of ethylene carbonate and 20 vol% (inclusive) to 50 vol% (exclusive) of 2-methyltetrahydrofuran.
Claim 18
Dependent Claim
90 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and prepared by dissolving lithium borofluoride (LiBF₄) in a solvent mixture having a composition ratio of 50 vol% (exclusive) to 80 vol% (inclusive) of ethylene carbonate and 20 vol% (inclusive) to 50 vol% (exclusive) of 2-methyltetrahydrofuran.
Claim 19
Dependent Claim
38 words
The secondary battery according to claim 14, characterized in that said lithium-containing material is one element selected from the group consisting of a lithium alloy, carbon-containing lithium ions, conductive polymer-containing lithium ions and a lithiuted transition metal chalcogene.
Claim 20
Dependent Claim
28 words
The secondary battery according to claim 14, characterized in that said concentration of lithium borofluoride (LiBF₄) with respect to said solvent mixture is 0.2 mol/ℓ to 1.5 mol/ℓ.
Claim 21
Dependent Claim
98 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and having a composition prepared by dissolving an electrolytic salt in a solvent mixture consisting of at least ethylene carbonate and 2-methyltetrahydrofuran and containing not more than 100 ppm of an organic peroxide as an impurity, and not more than 20 ppm of water.
Claim 22
Dependent Claim
98 words
A nonaqueous electrolyte secondary battery comprising: a positive electrode (4) housed in a case (1); a negative electrode (6) housed in said case (1) so that a separator (5) is sandwiched between said positive and negative electrodes (4, 6) consisting of lithium or lithium-containing material; and a nonaqueous electrolyte contained in said case (1) and having a composition prepared by dissolving an electrolytic salt in a solvent mixture consisting of at least ethylene carbonate and 2-methyltetrahydrofuran and containing not more than 100 ppm of an organic peroxide as an impurity, and not more than 20 ppm of water.
Claim 23
Dependent Claim
38 words
The secondary battery according to claim 17, characterized in that said lithium-containing material is one element selected from the group consisting of a lithium alloy, carbon-containing lithium ions, conductive polymer-containing lithium ions and a lithiuted transition metal chalcogene.
Claim 24
Dependent Claim
53 words
The secondary battery according to claim 17, characterized in that said nonaqueous electrolyte has a composition prepared by dissolving an electroytic salt in a solvent mixture consisting of at least ethylene carbonate and 2-methyltetrahydrofuran and subjected to a treatment of bringing said composition in contact with an insoluble absorbent and a conduction treatment.
Claim 25
Dependent Claim
29 words
The secondary battery according to claim 17, characterized in that said solvent mixture consists of 40 to 80 vol% of ethylene carbonate and 20 to 60 vol% of 2-methyltetrahydrofuran.
Claim 26
Dependent Claim
45 words
The secondary battery according to claim 17, characterized in that said solvent mixture consists of ethylene carbonate, 2-methyltetrahydrofuran, and at least one nonaqueous solvent selected from the group consisting of propylene carbonate, butylene carbonate, dimethyl carbonate, γ-butyrolactone, sulfolane, tetrahydrofuran, 2-methylfuran, 1,2-dimethoxyethane, diethoxyethane, 1,3-dioxolane, and 1,3-dimethoxypropane.
Claim 27
Dependent Claim
22 words
The secondary battery according to claim 17, characterized in that said electrolytic salt is lithium phosphate hexafluoride (LiPF₆) or lithium borofluoride (LiBF₄).
Claim 28
Dependent Claim
65 words
The secondary battery according to claim 17, characterized in that said nonaqueous electrolyte has a composition prepared by dissolving 0.1 mol% (inclusive) to 1 mol% (exclusive) of lithium phosphate hexafluoride (LiPF₆) in a solvent mixture consisting of at least ethylene carbonate and 2-methyltetrahydrofuran and containing not more than 100 ppm of an organic peroxide as an impurity and not more than 20 ppm of water.
Claim 29
Dependent Claim
70 words
The secondary battery according to claim 17, characterized in that said nonaqueous electrolyte has a composition prepared by dissolving lithium borofluoride (LiBF₄) in a solvent mixture consisting of 50 vol% (exclusive) to 80 vol% (inclusive) of ethylene carbonate and 20 mol% (inclusive) to 50 vol% (exclusive) of 2-methyltetrahydrofuran and containing not more than 100 ppm of an organic peroxide as an impurity and not more than 20 ppm of water.
References Cited (Backward Citations)
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