EP0409192A1
Expired / Lapsed
EP
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Electrode for secondary battery
Assignee: Mitsubishi Chemical Corp
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Filing: 1990-07-18
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Granted: —
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Expires: 2010-07-18
Abstract
Abstract There is presented an electrode for secondary battery, comprising lithium or an alkali metal composed mainly of lithium doped as the active substance in a carrier containing 70 to 99.7 % by weight of a carbonaceous material shown below by (a) and 0.1 to 30 % by weight of an elastomer: (a) a carbonaceous material with a hydrogen/carbon (H/C) atomic ratio less than 0.15, a spacing (d₀₀₂) of the (002) plane according to the X-ray wide angle diffraction method of 3.37 Å or more and the crystallite size (Lc) in the C-axis direction of 220 Å or less. The amount of the active substance doped is large to give an electrode having high energy density, and also a coil-shaped electrode having flexibility can be obtained.
Inventors
- 👤 Mitsutaka C/O Yokkaichi Research Center Miyabashi
- 👤 Hiroshi C/O Yokkaichi Research Center Yui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 00:47
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/134; H01M10/00; H01M10/05; H01M10/052; H01M4/04; H01M4/0438; H01M4/0459; H01M4/0461; H01M4/36; H01M4/362; H01M4/364; H01M4/38; H01M4/381; H01M4/58; H01M4/583; H01M4/587; H01M4/62; H01M4/621; H01M2004/026; H01M2004/027; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M2300/0065; H01M4/043; H01M4/0433; H01M4/049; H01M4/0492; H01M4/40; H01M4/405; H01M4/624; H01M4/625; H01M4/64; H01M4/66; H01M4/661; H01M4/70; H01M4/72; H01M4/74; H01M6/00; H01M6/04; H01M6/06; H01M6/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
An electrode for secondary battery, comprising lithium or an alkali metal composed mainly of lithium doped as the active substance in a carrier containing 70 to 99.7 % by weight of a carbonaceous material shown below by (a) and 0.1 to 30 % by weight of an elastomer: (a) a carbonaceous material with a hydrogen/carbon (H/C) atomic ratio less than 0.15, a spacing (d₀₀₂) of the (002) plane according to the X-ray wide angle diffraction method of 3.37 Å or more and the crystallite size (Lc) in the C-axis direction of 220 Å or less.
Claim 2
Dependent Claim
95 words
An electrode for secondary battery, comprising lithium or an alkali metal composed mainly of lithium doped as the active substance in a carrier containing 70 to 99.7 % by weight of a carbonaceous material shown below by (a) and 0.1 to 30 % by weight of an elastomer: (a) a carbonaceous material with a hydrogen/carbon (H/C) atomic ratio less than 0.15, a spacing (d₀₀₂) of the (002) plane according to the X-ray wide angle diffraction method of 3.37 Å or more and the crystallite size (Lc) in the C-axis direction of 220 Å or less.
Claim 3
Dependent Claim
46 words
An electrode for secondary battery according to Claim 1, wherein the carbonaceous material has a G value as defined by the following formula of less than 2.5 in the Raman spectrum analysis by use of an argon ion laser beam with a wavelength of 5145 Å:
Claim 4
Dependent Claim
29 words
An electrode for secondary battery according to Claim 1, which is a compression molded product of a mixture of particles of the carbonaceous material and particles of the elastomer.
Claim 5
Dependent Claim
29 words
An electrode for secondary battery according to Claim 1, which is a product obtained by mixing and drying particles of the carbonaceous material and an emulsion of the elastomer.
Claim 6
Dependent Claim
38 words
An electrode for secondary battery according to Claim 1, which is a product obtained by coating a solution of the elastomer onto the surface of particles of the carbonaceous material, drying the coated product and then pressurizing it.
Claim 7
Dependent Claim
43 words
An electrode for secondary battery according to Claim 1, which is a product obtained by mixing particles of the carbonaceous material coated on the surface with a solution of the elastomer and uncoated particles of the carbonaceous material, followed by pressurization under heating.
Claim 8
Dependent Claim
57 words
An electrode for secondary battery according to Claim 1, which is a product obtained by pressurizing under heating a mixture of 4/5 or less in weight ratio of particles of the carbonaceous material coated on the surface with a solution of the elastomer and 1/5 or more in weight ratio of uncoated particles of the carbonaceous material.
Claim 9
Dependent Claim
16 words
An electrode for secondary battery according to Claim 1, wherein the elastomer is a thermoplastic elastomer.
Claim 10
Dependent Claim
33 words
An electrode for secondary battery according to Claim 8, wherein the elastomer is a styrene type thermoplastic polymer comprising a block copolymer of styrene and a conjugated diene or a hydrogenated product thereof.
Claim 11
Dependent Claim
23 words
An electrode for secondary battery according to Claim 9, wherein the styrene type thermoplastic elastomer has a molecular weight of 2,000 to 50,000.
References Cited (Backward Citations)
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