Non-aqueous electrolytic solution for lithium secondary battery or lithium ion capacitor, and lithium secondary battery or lithium ion capacitor using the same
摘要
說明書
In the non-aqueous electrolytic solution according to the second aspect of the present invention, the total content of dimethyl carbonate and ethyl propionate is 30% by volume or more, and preferably 32% by volume or more, in relation to the whole of the non-aqueous solvent, from the viewpoint of the improvement of the electric conductivity. The upper limit of the total content of dimethyl carbonate and ethyl propionate is 40% by volume or less, and preferably 37% by volume or less, in relation to the whole of the non-aqueous solvent, from the viewpoint of the improvement of the electrochemical characteristics in a high temperature environment.
In the non-aqueous electrolytic solution according to the second aspect of the present invention, the total content of the chain carbonate and ethyl propionate is not particularly limited, but the chain carbonate and ethyl propionate are preferably used in a total content range from 70 to 80% by volume in relation to the whole of the non-aqueous solvent. The above-described range is preferable because when the content concerned is 70% by volume or more, the viscosity of the non-aqueous electrolytic solution is not too high, and when the content concerned is 80% by volume or less, the electrochemical characteristics in a wide temperature range due to the decrease of the electric conductivity of the non-aqueous electrolytic solution is less likely to worsen.
