Composite material with oxygen ion conductor and oxygen vacancy variable valence metal oxide and lithium battery thereof

The invention belongs to the technical field of lithium ion batteries, and discloses a composite material with an oxygen ion conductor and an oxygen vacancy variable-valence metal oxide and a lithium battery thereof, a coating layer of the oxygen vacancy variable-valence metal oxide material coated with the oxygen ion conductor is the oxygen ion conductor, an inner layer is the oxygen vacancy variable-valence metal oxide, and an outer layer is the oxygen vacancy variable-valence metal oxide. The oxygen ion conductor of the coating layer has the capability of rapidly transmitting active oxygen, so that the specificity of the reaction between the oxygen vacancy variable valence metal oxide material and the active oxygen is improved. Meanwhile, direct contact oxidation of the inner layer high-active oxygen vacancy variable-valence metal oxide and air is avoided, and the chemical and electrochemical stability of the inner layer high-active oxygen vacancy variable-valence metal oxide is improved while the reaction