METHOD OF DETECTION, DETECTOR AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To detect precipitated lithium in a lithium secondary battery with high sensitivity.SOLUTION: A precipitation detector 10 of the invention comprises: a cavity in which a lithium secondary battery is placed as a sample; an electromagnet for applying a magnetic field to the cavity; a microwave unit for oscillating microwaves to the cavity; a detector for detecting the microwave absorption of the sample; and a control section for detecting precipitated lithium in the sample on the basis of a detected signal. A method of detection includes the steps of: splitting a spin level of lithium precipitated in the sample by applying a magnetic field to the cavity of an electron spin resonance device in which the lithium secondary battery is placed as a sample; detecting a signal based on a resonance phenomenon generated by oscillating microwaves to the cavity; and detecting the precipitated lithium in the sample on the basis of the detected signal.