EP0317351A2
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Secondary battery
Assignee: Hitachi Ltd
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Filing: 1988-11-18
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Granted: —
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Expires: 2008-11-18
Abstract
Abstract A secondary battery comprised of a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a sodium-cobalt oxide as the main component, the negative electrode is composed of a composite body comprising a sodium alloy such as a sodium/lead or sodium/tin alloy, a carbon material and a binder, and the non-aqueous electrolyte is composed of a sodium salt and an ether compound. The positive electrode and negative electrode is prepared by a process wherein a binder is swollen with or dissolved in an organic solvent, the swollen or dissolved binder is mixed with a carbon material, and the mixture is then mixed with a sodium alloy or a sodium-cobalt oxide directly or after removal of the organic solvent.
Inventors
- 👤 Toshikazu Central Res. Lab. Shishikura
- 👤 Masataka Central Res. Lab. Takeuchi
- 👤 Yoshihiko Central Res. Lab. Murakoshi
- 👤 Hiroshi Central Res. Lab. Konuma
- 👤 Mutsumi Central Res. Lab. Kameyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:59
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/38; H01M4/40; H01M10/00; H01M10/05; H01M10/054; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0569; H01M4/13; H01M4/131; H01M4/134; H01M4/139; H01M4/1391; H01M4/1395; H01M10/0568; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
59 words
A secondary battery comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a sodium-cobalt oxide as the main component, the negative electrode is composed of a composite body comprising a sodium alloy, a carbon material and a binder, and the non-aqueous electrolyte is composed of a sodium salt and an ether compound.
Claim 2
Dependent Claim
59 words
A secondary battery comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a sodium-cobalt oxide as the main component, the negative electrode is composed of a composite body comprising a sodium alloy, a carbon material and a binder, and the non-aqueous electrolyte is composed of a sodium salt and an ether compound.
Claim 3
Dependent Claim
30 words
A secondary battery as set forth in claim 1, wherein the main components electrode are sodium and at least one metal selected from the group consisting of lead and tin.
Claim 4
Dependent Claim
31 words
A secondary battery as set forth in claim 1, wherein the carbon material as the constituent of the negative electrode is selected from the group consisting of carbon black and graphite.
Claim 5
Dependent Claim
24 words
A secondary battery as set forth in claim 1, wherein the binder as the constituent of the negative electrode is an olefin copolymer rubber.
Claim 6
Dependent Claim
41 words
A secondary battery as set forth in claim 1, wherein the negative electrode comprises at least 80% by weight of the sodium alloy, 3 to 20% by weight of the carbon material and 1 to 8% by weight of the binder.
Claim 7
Dependent Claim
34 words
A secondary battery as set forth in claim 1, wherein the sodium/cobalt atomic ratio in the sodium-cobalt oxide as the constituent of the positive electrode is in the range of from 0.65/1 to 0.90/1.
Claim 8
Dependent Claim
29 words
A secondary battery as set forth in claim 1, wherein the sodium-cobalt oxide as the constituent of the positive electrode comprises at least 70% of a τ-type crystal structure.
Claim 9
Dependent Claim
54 words
A secondary battery as set forth in claim 1, wherein the positive electrode is composed of a mixture comprising the sodium-cobalt oxide, carbon black and the binder, in which the content of carbon black is not larger than 7% by weight and the content of the binder is not larger than 6% by weight.
Claim 10
Dependent Claim
28 words
A secondary battery as set forth in claim 1, wherein the binder as the constituent of the positive electrode is a fluorohydrocarbon resin or an olefin copolymer rubber.
Claim 11
Dependent Claim
24 words
A secondary battery as set forth in claim 1, wherein the sodium salt as the constituent of the non-aqueous electrolyte is NaPF₆ or NaBF₄.
Claim 12
Dependent Claim
76 words
A secondary battery as set forth in claim 1, wherein the ether compound as the constituent of the non-aqueous electrolyte is at least one member selected from the group consisting of compounds represented by the following general formula: R¹-O-(C m H 2m O) n R² wherein R¹ and R² independently stand for an alkyl group having 1 to 8 carbon atoms, m is 2 or 3, and n is an integer of from 1 to 8.
Claim 13
Dependent Claim
22 words
A secondary battery as set forth in claim 1, wherein the ether compound as the constituent of the non-aqueous electrolyte is 1,2-dimethoxyethane.
Claim 14
Dependent Claim
57 words
A secondary battery as set forth in claim 1, wherein the ether compound as the constituent of the non-aqueous electrolyte is selected from the group consisting of triethylene glycol dimethyl ether, triethylene glycol diethyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, dipropylene glycol dimethyl ether, tripropylene glycol dimethyl ether, diethylene glycol dimethyl ether and 1-ethoxy-2-methoxyethane.
Claim 15
Dependent Claim
81 words
A secondary battery as set forth in claim 1, wherein the ether compound as the constituent of the non-aqueous electrolyte is a mixture comprising 1,2-dimethoxyethane and a compound represented by the general formula: R¹-O-(C m H 2m O) n R² wherein R¹ and R² independently stand for an alkyl group having 1 to 8 carbon atoms, m is 2 or 3, and n is an integer of from 2 to 8. at a mixing ratio from 20/1 to 1/2 by volume.
Claim 16
Dependent Claim
41 words
A secondary battery as set forth in claim 1, wherein the ether compound as the constituent of the non-aqueous electrolyte is a mixture comprising 1,2-dimethoxyethane and tetraethylene glycol dimethyl ether at a mixing ratio of from 20/1 to 1/2 by volume.
Claim 17
Dependent Claim
43 words
A secondary battery as set forth in claim 1, wherein the bulk density of the positive electrode exclusive of a collector is 2.3 to 3.5 g/cm³ and the bulk density of the negative electrode exclusive of an collector is 1.7 to 2.5 g/cm³.
Claim 18
Dependent Claim
71 words
A process for the preparation of an electrode for a non-aqueous secondary battery, which comprises forming a positive electrode or negative electrode by using a binder, wherein the binder is swollen with or dissolved in an organic solvent, the swollen or dissolved binder is mixed with a carbon material, and the mixture is then mixed with a sodium alloy or a sodium-cobalt oxide directly or after removal of the organic solvent.
Claim 19
Dependent Claim
71 words
A process for the preparation of an electrode for a non-aqueous secondary battery, which comprises forming a positive electrode or negative electrode by using a binder, wherein the binder is swollen with or dissolved in an organic solvent, the swollen or dissolved binder is mixed with a carbon material, and the mixture is then mixed with a sodium alloy or a sodium-cobalt oxide directly or after removal of the organic solvent.
Claim 20
Dependent Claim
25 words
A process for the preparation of an electrode for a non-aqueous secondary battery according to claim 17, wherein the organic solvent is xylene or cyclohexane.
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