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AssigneeHitachi Vehicle Energy, Ltd.
InventorsTakefumi Okumura, Takahiro Yamaki, Masanori Yoshikawa, Yoshimi Yanai, Toyotaka Yuasa
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The present invention provides a lithium secondary battery which has improved safety, mainly coming from use of an electrolyte solution which is not inflammable at room temperature (20° C.), while not deteriorating output characteristics at low temperatures and room temperature or output maintenance characteristics after storage at high temperature (50° C.). The lithium secondary battery of the present invention, encased in a container, is provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution containing a cyclic carbonate and a linear carbonate as solvents and a compound such as VC at composition ratios of 18.0 to 30.0%, 74.0 to 81.9% and 0.1 to 1.0%, respectively, based on the whole solvents, all percentages by volume.
A lithium secondary battery provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution, wherein
A lithium secondary battery provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution, wherein
A lithium secondary battery provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution, wherein
A lithium secondary battery, comprising a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution, wherein the electrolyte solution comprises as solvents ethylene carbonate (EC) in an amount of 18.0 to 30.0% by volume, vinylene carbonate (VC) in an amount of 0.1 to 1.0% by volume, and the balance comprising dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) in a DMC/EMC ratio by volume of 0.8 to 1.3, wherein the electrolyte solution has an ion conductivity of 2 mS/cm or more at −30° C.
A lithium secondary battery provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution, wherein
Dependencies are inferred from the claim text.