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|1. (WO2018084675) REACTION ESTIMATION METHOD FOR SECONDARY BATTERY AND SECONDARY BATTERY COMPRISING BATTERY CELL USED FOR SAME|
|Applicants:||LG CHEM, LTD.
|Title:||REACTION ESTIMATION METHOD FOR SECONDARY BATTERY AND SECONDARY BATTERY COMPRISING BATTERY CELL USED FOR SAME|
The present invention provides a reaction estimation method for a secondary battery and a battery cell used for the same for designing a secondary battery in which a rapid charging performance is improved by estimating a reaction of a electrode in a thickness direction, the method comprising: (a) a step of preparing a battery cell which has a structure of a first electrode/a separating film/a reference electrode/a separating film/a second electrode, wherein the second electrode has a structure of an upper layer portion/a porous film/a lower layer portion; (b) a step of setting a state-of-charge to estimate a reaction of the battery cell; (c) a step of measuring a voltage and a current respectively of the upper layer portion, the lower layer portion, and the battery cell while reaching the set state-of-charge; (d) a step of measuring an open circuit voltage of the upper layer portion, the lower layer portion, and the battery cell after the state-of-charge; and (e) a step of comparing and analyzing a capacitance, obtained using the measured current, and the measured open circuit voltage.