▎ 摘　　要

NOVELTY - Sodium-based double-ion battery with novel phosphorus encapsulated in mesoporous graphene negative electrode comprises a carbon positive electrode material, electrolyte and phosphorus encapsulated in the negative electrode material where the phosphorus is encapsulated in the mesoporous negative electrode material composed of mesoporous graphene phosphorus by in-situ composite, the mesoporous graphene content is 10-70%, the phosphorus content is 30-90%, the electrolyte is 0.1- 5M sodium salt electrolyte. USE - Sodium-based double-ion battery with novel phosphorus encapsulated in mesoporous graphene negative electrode. ADVANTAGE - The sodium-based double-ion battery with novel phosphorus encapsulated in mesoporous graphene negative electrode prevents agglomeration of phosphorus particles and reduces absolute strain, improves the structure stability under sodium and sodium removing effect, the negative electrode exhibits excellent long cycle performance, large reversible capacity and excellent magnification performance, doping of nitrogen element and formation of phosphorus-carbon chemical bonds in the graphene matrix, improves the adsorption energy of phosphorus atoms and provides effective contact area after pairing with the positive electrode carbon material, manufacturing an innovative sodium-based double-ion battery and the electrolyte is sodium salt electrolyte of 0.1-5M, method is green and environment-friendly, batch stability is high, which is good for scale preparation, easy to mass production, develops an effective strategy for electric automobile. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing new phosphorus- encapsulated sodium-based double-ion graphene negative electrode which comprises: i. preparing anode materials in which phosphorus is encapsulated in the negative electrode graphite alkene material, performing in-situ gas phase composite on the mesoporous graphene phosphorus according to proportion, keeping constant temperature for 2-12 hours at 500-900 ℃, entering the mesoporous graphene with multi-stage pore structure by means of phosphorus gas phase diffusion, then reducing the temperature to 100℃ and keeping the temperature for 12-48 hours, finally naturally cooling to room temperature; ii. pairing the negative electrode material with the carbon material positive electrode, assembling in the glove box of argon gas atmosphere to obtain the sodium-based double-ion battery.