▎ 摘　　要

NOVELTY - Sodium ion battery cathode material comprises glass carbon sheet and active layer. The active layer comprises 75-82 pts. wt. load active material, 10-14 pts. wt. conductive agent and 8-12 pts. wt. adhesive. The load active material is prepared by (a) mixing diethylenetriamine and deionized water, dripping graphene oxide, centrifuging to take precipitate, and preparing pleated graphene, (ii) stirring and mixing branched polyethyleneimine, tetrahydrofuran and ethanol under protection of nitrogen, and dripping di-tert-butyl dicarbonate diluent to prepare assembling solution, (iii) mixing pleated graphene with assembling solution, dripping trifluoroacetic acid, adding triethylamine to neutralize, dripping pleated graphene, centrifuging precipitate and placing in hydrazine hydrate solution and preparing loose graphene cluster, and (iv) stirring and dissolving bismuth nitrate and acetone, adding loose graphene clusters, heating, and dripping sodium carbonate solution. USE - Used as sodium ion battery cathode material. ADVANTAGE - The material: has large loading surface; improves loading of bismuth compounds, and specific capacity of the battery; has excellent toughness of clustered and pleated graphene; maintains the shape during the intercalation and deintercalation of sodium ions; and has reduced crushing, greatly improved charge and discharge stability, first reversible specific capacity of reaching 165.2173.9 mAh g1 at a current density of 0.5 A g1 after testing, and capacity retention rate of 81.6688.26% after 500 cycles at a high current density of 20 A g1. DETAILED DESCRIPTION - Sodium ion battery cathode material comprises glass carbon sheet and active layer. The active layer comprises 75-82 pts. wt. load active material, 10-14 pts. wt. conductive agent and 8-12 pts. wt. adhesive. The load active material is prepared by (a) mixing diethylenetriamine and deionized water, heating to 45-55°C under nitrogen protection, dripping graphene oxide under ultrasonic dispersion, heating to 90-95°C for refluxing and reacting for 3-4 hours, centrifuging to take precipitate, drying and crushing, placing in an oxidation furnace and baking at 220-260°C for 2-2.5 hours to shape, and preparing pleated graphene, (ii) stirring and mixing branched polyethyleneimine, tetrahydrofuran and ethanol under protection of nitrogen, placing in ice-water bath to maintain constant temperature, and dripping di-tert-butyl dicarbonate diluent under ultrasonic dispersion to react for 1.5-2 hours to prepare assembling solution, (iii) mixing two-thirds of amount of pleated graphene with assembling solution, applying 20 kHz ultrasonic dispersion, passing into water bath and reacting at a constant temperature of 35-42°C for 40-50 minutes, dripping trifluoroacetic acid and stirring for 1-1.2 hours, then adding triethylamine to neutralize, slowly adding remaining amount of pleated graphene and stirring for 12 hours, centrifuging the precipitate and placing in a hydrazine hydrate solution for soaking for 24 hours, washing the precipitate and drying with an ethanol solution by centrifugation again to prepare loose graphene cluster, and (iv) stirring and dissolving bismuth nitrate and acetone, adding loose graphene clusters and mixing at high speed, heating to 50-58°C and refluxing, dripping sodium carbonate solution until the pH value is 8-8.5, allowing to stand for 1.4-1.6 hours, taking filter cake by centrifugation, washing, drying, then placing in a vacuum furnace, roasting at 310-320°C for 1.8-2.2 hours, cooling and dispersing to obtain the finished product. An INDEPENDENT CLAIM is also included for preparing the cathode material.