SECONDARY BATTERY, PREPARATION METHOD AND ELECTRIC DEVICE

A secondary battery, a preparation method, and an electric device. The secondary battery includes a positive electrode plate, a separator, a negative electrode plate and an electrolyte, where the negative electrode plate includes a lithium metal sheet and a modification layer disposed on at least one surface of the lithium metal sheet, and the modification layer includes phosphate and lithium metal alloy. The surface of the lithium metal sheet is provided with the modification layer which can effectively conduct lithium ions, and the lithium metal alloy is able to achieve uniform deposition of lithium ions, prevent the growth of lithium dendrites, and improve the electrochemical and safety performance of the battery.