Secondary battery-use active material, secondary battery-use electrode, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus
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United States of America Patent
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Feb 20, 2018
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app pub date -
Jan 9, 2014
filing date -
Jan 17, 2013
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Abstract
A secondary battery includes: a cathode; an anode; and an electrolytic solution. The cathode contains an active material capable of inserting and extracting an electrode reactant. A ratio IS/IF of a peak intensity IS derived from SO2− and a peak intensity IF derived from LiF2− is 0.04 or more, the peak intensity IS and the peak intensity IF being obtained by negative ion analysis on the active material with use of time-of-flight secondary ion mass spectrometry. Since a secondary battery according to the present invention has an intensity ratio IS/IF of 0.04 or more as obtained by a negative ion analysis of the active material using time-of-flight secondary ion mass spectrometry, the secondary battery is able to achieve excellent battery characteristics.
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