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AssigneeSanyo Electric Co., Ltd.
InventorsHiroyuki Matsumoto, Takeshi Ogasawara
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To provide a conductive agent for a nonaqueous electrolyte secondary battery and the like, in which oxidative decomposition reaction of an electrolyte is sufficiently suppressed during charging and discharging under high-temperature, high-voltage conditions and thus the cycle characteristics under these conditions are improved. A conductive agent main body composed of carbon and a compound attached to a surface of the conductive agent main body are contained. The average particle size of primary particles or secondary particles of the conductive agent main body is larger than the average particle size of the compound and the compound contains at least one metal element selected from the group consisting of aluminum, zirconium, magnesium, and a rare earth element.
A conductive agent for a nonaqueous electrolyte secondary battery, comprising a conductive agent main body composed of carbon and a compound attached to a surface of the conductive agent main body, wherein the average particle size of primary particles or secondary particles of the conductive agent main body is larger than the average particle size of the compound and the compound contains at least one metal element selected from the group consisting of aluminum, zirconium, magnesium, and a rare earth element, wherein the compound has an average particle size of 20 nm or more and 100 nm or less.
A positive electrode for a nonaqueous electrolyte secondary battery, wherein a conductive agent is present on a surface of a positive electrode active material, the conductive agent includes a conductive agent main body composed of carbon and a compound attached to a surface of the conductive agent main body, the average particle size of primary particles or secondary particles of the conductive agent main body is larger than the average particle size of the compound, and the compound contains at least one metal element selected from the group consisting of aluminum, zirconium, magnesium, and a rare earth element, wherein the compound has an average particle size of 20 nm or more and 100 nm or less.
A positive electrode for a nonaqueous electrolyte secondary battery, wherein a conductive agent is present on a surface of a positive electrode active material, the conductive agent includes a conductive agent main body composed of carbon and a compound attached to a surface of the conductive agent main body, the average particle size of primary particles or secondary particles of the conductive agent main body is larger than the average particle size of the compound, and the compound contains at least one metal element selected from the group consisting of aluminum, zirconium, magnesium, and a rare earth element, wherein the compound contains at least one selected from the group consisting of a hydroxide of the metal element, an oxyhydroxide of the metal element, and a carbonate compound of the metal element.
Dependencies are inferred from the claim text.