▎ 摘　　要

NOVELTY - Prediction of concentration change of carbon intercalation compound in negative electrode active layer during storage of charged battery cell, involves using relation involving the initial concentration (c60) of carbon intercalation compound, the concentration (c6t) of carbon intercalation compound at storage elapsed time (t), time constants (a,b), storage elapsed time (t), and the effective reaction rate constant (k). USE - Prediction of concentration change of carbon intercalation compound in negative electrode active layer during storage of charged battery cell e.g. lithium ion secondary battery. ADVANTAGE - The method is non-destructive and economical, reduces side reactions of electrode, and enables accurate checking of concentration change of intercalation compound and improvement of irreversible capacity loss of batteries. DETAILED DESCRIPTION - Prediction of concentration change of carbon intercalation compound in negative electrode active layer during storage of charged battery cell, involves using relation involving the initial concentration (c60) of carbon intercalation compound, the concentration (c6t) of carbon intercalation compound at storage elapsed time (t), time constants (a: 0-1, b: 0-10), storage elapsed time (t), and the effective reaction rate constant (k: 0.001-0.1 hour-1), as given by, c6t/c60=1-(a(1-e(power)(-kt)))/c601+(a/b)e(power)(-kt). An INDEPENDENT CLAIM is included for detection of parameter related to concentration change of carbon intercalation compound.