Positive pole piece, preparation method thereof and sodium ion battery

• Main Authors: XU SHAOXIA, YANG HUI, WANG GUANGJIN, MO ZHIBO, LI MOHENG, XUAN WENHUI, ZHENG HONGDOU
• Format: Patent
• Language: Chinese; English
• Published: 13.10.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a positive pole piece, a preparation method thereof and a sodium ion battery, and particularly relates to the technical field of sodium ion batteries. The positive pole piece comprises a current collector, wherein a first active material layer and a second active material layer are sequentially laminated on the surface of at least one side of the current collector; the first active material layer comprises a transition metal oxide, conductive carbon black and a carbon nanotube; the second active material layer comprises a polyanion compound, conductive carbon black and a carbon nanotube. According to the positive pole piece provided by the invention, two positive pole materials are layered, and the transition metal oxide is used in the inner layer, so that the transition metal oxide is prevented from being in contact with electrolyte, and meanwhile, the advantage of high capacity of the transition metal oxide is kept; meanwhile, the polyanion compound is used as the outer layer material