▎ 摘　　要

NOVELTY - A modified electrode comprises an electrode, and a modified layer, which is located on the surface of the electrode having a thickness of ≯ 150 microns, comprises a composite oxide of lithium and metal, which is aluminum, titanium, zirconium, tungsten, tantalum, and/or hafnium, and has a thickness of 25-50 nm. USE - The modified electrode is useful for lithium-ion battery (claimed) used in consumer electronics, intelligent robot and electric vehicle. ADVANTAGE - The modified electrode can reduce the increase rate of the internal resistance and improve the cycle performance of the battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the modified electrode, which involves: (1) uniformly mixing the electrode with 1-methyl-2-pyrrolidone to obtain a mixed slurry, coating on a surface of an aluminum foil, drying, and rolling to obtain an electrode with an unmodified surface; (2) performing surface modification on the electrode by placing the electrode in a reaction chamber, and heating the electrode by taking hot inert gas as a medium, depositing the modified layer on the surface of the electrode by atomic layer deposition, introducing a gas-phase precursor of the metal into the reaction chamber by using a carrier gas in a pulse form, introducing inert gas for cleaning, introducing an oxygen source into the reaction chamber by using carrier gas in a pulse mode, introducing inert gas for cleaning, and obtaining the modified electrode intermediate until the thickness of preset modified layer is reached; and (3) heating the modified electrode intermediate to 300-500℃ for 0.5-2 hours.