▎ 摘　　要

NOVELTY - Negative electrode pole piece comprises a sodium metal base body and a modified layer set on at least one surface of the sodium metal base body, the modified layer comprises an ion conductor, the ion conductor comprises sodium super-ion conductor, sodium ion conductor or oxide-type sodium ion conductor. USE - Negative electrode pole piece. ADVANTAGE - The negative electrode pole piece improves the interface ion transmission efficiency, induce metal uniform deposition to improve the circulation stability of the sodium metal electrode, increases the safety and service life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a secondary battery comprises the negative electrode sheet; and (2) an electric device which comprises the secondary battery where the secondary battery is used as the power supply of the electric device.