JP2006086116A5 - - Google Patents

Claims (21)

  A positive electrode for a lithium battery comprising an active material capable of occluding and releasing lithium ions, a carbon-based conductive aid, and a binder, wherein the amount of carbon-based conductive aid added is 0.1 to 2 mass% of the total positive electrode, and The carbon-based conductive assistant contains carbon fibers having an average fiber diameter of 1 to 200 nm, and the volume of the active material capable of occluding and releasing lithium ions calculated from the true density is 70% or more in the positive electrode volume. A positive electrode for a lithium battery.   2. The positive electrode for a lithium battery according to claim 1, wherein the carbon fiber is a graphite-based carbon fiber heat-treated at 2000 ° C. or higher.   The positive electrode for a lithium battery according to claim 1 or 2, wherein the total amount of metal impurities in the carbon fiber is 30 ppm or less.   The positive electrode for a lithium battery according to any one of claims 1 to 3, wherein the carbon fiber is a graphite-based carbon fiber containing 0.1 to 100,000 ppm of boron.   The positive electrode for a lithium battery according to any one of claims 1 to 4, wherein the carbon fiber has an average aspect ratio of 50 to 15000.   The positive electrode for a lithium battery according to any one of claims 1 to 5, wherein the carbon fiber has an average fiber diameter of 10 to 200 nm.   The positive electrode for a lithium battery according to any one of claims 1 to 6, wherein the carbon fiber has a hollow structure therein.   The positive electrode for a lithium battery according to any one of claims 1 to 7, wherein the carbon fiber includes a branched carbon fiber.   The positive electrode for a lithium battery according to any one of claims 1 to 8, wherein the active material is a metal oxide compound capable of occluding and releasing lithium ions.   The positive electrode for a lithium battery according to claim 9, wherein the average primary particle diameter of the metal oxide compound, which is an active material capable of occluding and releasing lithium ions, is 0.5 to 30 µm. Metal oxide-based compounds cobalt oxide in the lithium ion is capable of absorbing and releasing active material contained more than 60 wt%, the electrode density of Claim 9 or 10 is 3.7 g / cm ³ or more Positive electrode for lithium batteries. 11. The lithium according to claim 9 or 10, wherein the metal oxide compound, which is an active material capable of occluding and releasing lithium ions, contains manganese oxide in an amount of 60% by mass or more and has an electrode density of 3.2 g / cm ³ or more. Positive electrode for battery. A metal oxide compound which is an active material capable of occluding and releasing lithium ions contains a mixture of cobalt oxide and manganese oxide in an amount of 80% by mass or more, and the electrode density is 3.5 g / cm ³ or more. Item 11. The positive electrode for a lithium battery according to Item 9 or 10. Nickel oxide contains more than 60 wt% of lithium ion in the metal oxide-based compound is capable of absorbing and releasing active material, the electrode density of Claim 9 or 10 is 3.5 g / cm ³ or more Positive electrode for lithium batteries. Metal oxide-based compounds cobalt-nickel-based composite oxide in a lithium ion is capable of absorbing and releasing active material contained 60% by mass or more, according to claim 9 or 10 electrode density of 3.6 g / cm ³ or more A positive electrode for a lithium-based battery as described in 1. Metal oxide-based compounds cobalt-manganese-based composite oxide in a lithium ion is capable of absorbing and releasing active material contained 60% by mass or more, according to claim 9 or 10 electrode density of 3.6 g / cm ³ or more The positive electrode for lithium type batteries as described in 2. Metal oxide-based compounds of cobalt-nickel-manganese-based composite oxide in a lithium ion is capable of absorbing and releasing active material contained more than 60 wt%, claim electrode density of 3.6 g / cm ³ or more 9 Or the positive electrode for a lithium-based battery according to 10. The metal oxide compound, which is an active material capable of occluding and releasing lithium ions, contains 60% by mass or more of an iron olivic acid compound, and the electrode density is 2.9 g / cm ³ or more. Positive electrode for lithium batteries.   The lithium battery which contains the positive electrode for lithium batteries in any one of Claims 1-18 as a component.   A lithium secondary battery comprising the positive electrode for a lithium battery according to any one of claims 1 to 18 as a constituent element.   A non-aqueous electrolyte and / or a non-aqueous polymer electrolyte is used, and ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene carbonate, butylene are used as the non-aqueous solvent used in the non-aqueous electrolyte and / or non-aqueous polymer electrolyte. The lithium secondary battery according to claim 20, comprising at least one selected from the group consisting of carbonate and vinylene carbonate.