Non-aqueous electrolyte lithium secondary battery

Abstract

A non-aqueous electrolyte includes (i) an inhibitor against a reaction between an anode and a linear ester; (ii) a mixed organic solvent containing cyclic carbonate and the linear ester; and (iii) an electrolyte salt, wherein the inhibitor is any one compound or a mixture of at least two compounds selected from the group consisting of cyclic carbonate with a vinyl group, fluorinated ethylene carbonate, vinylene carbonate, cyclic acid anhydride, a compound having a cyclic S=O group and an acrylate-based compound. Also, an electrochemical device includes a cathode, an anode and the above non-aqueous electrolyte.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte lithium secondary battery, and more particularly to a lithium secondary battery having improved discharge characteristics at high temperatures. Background technique [0002] In recent years, interest in energy storage technologies has increased. As energy storage technology expands to devices such as cellular phones, camcorders, and notebook personal computers, as well as electric vehicles, the demand for high-energy-density batteries used as energy sources for the electronic devices increases. Lithium-ion secondary batteries are one of the most satisfactory batteries, and a great deal of research for their improvement is actively being conducted. [0003] Among the currently used secondary batteries, a lithium secondary battery developed in the early 1990s includes an anode composed of a carbon material capable of occluding or releasing lithium ions, a cathode composed of a lithium-containing ...

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Problems solved by technology

However, methyl acetate also has a relatively high reactivity towards the anode, so the discharge characteristics are reduced

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