LITHIUM-ION SECONDARY BATTERY
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United States of America Patent
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Oct 9, 2015
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Dec 19, 2014
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The present invention is a lithium-ion secondary battery including: a positive electrode containing a positive electrode active material; and an electrolyte solution containing a supporting electrolyte and a non-aqueous solvent, wherein the positive electrode active material contains a lithium-nickel composite oxide, and the electrolyte solution further contains vinylene carbonate (VC), fluoroethylene carbonate (FEC), and a boron complex of the formula (1). The content of the VC in the electrolyte solution is more than 0 mass % and 2.5 mass % or less, the content of the FEC in the electrolyte solution is more than 0 mass % and 2.0 mass % or less, the content of the boron complex of the formula (1) in the electrolyte solution is more than 0 mass % and 1.0 mass % or less, and the total content of the VC, the FEC, and the boron complex of the formula (1) in the electrolyte solution is less than 4.5 mass %.
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