▎ 摘　　要

NOVELTY - Synthesizing sodium vanadium phosphate/carbon cathode composite material involves (S1) adding vanadium source compound, sodium source compound, phosphorus source compound, carbon source (A), carbon source (B) and dispersant in ball mill jar, and feeding in planetary ball mill for solid-phase ball milling, and feeding in vacuum drying oven for vacuum drying, and grinding dried powder to obtain sodium vanadium phosphate/carbon precursor powder, and (S2) applying rapid high-temperature thermal shock to the precursor in inert atmosphere or reducing atmosphere. The carbon source (A) comprises one or more of oxalic acid, glucose, sucrose, ascorbic acid, malic acid, folic acid and maltose. The carbon source (B) comprises one or more of glucose, sucrose, citric acid, malic acid, ascorbic acid, maltose, adipic acid, ethylene glycol, Ketjen black (RTM: electroconductive carbon black), acetylene black, Superp(RTM: carbon black), graphene oxide and carbon nanotubes. USE - Synthesis of sodium vanadium phosphate/carbon cathode composite material for sodium ion batteries. ADVANTAGE - The method shortens the times required by sintering of existing tube furnace to one time and one minute, and reduces process cost. The method retains original structure of precursor carbon source to great extent, and forms secondary particles with larger particle sizes, so the material has excellent cycle performance and high tap density. The material has excellent high rate performance through micropores formed by graphitizing carbon source to generate gas, and the specific discharge capacity of material reaches up to 88.3 mAh/g under high current of 50℃. The method is economical, has short time, less process flow and easy process controllability and wide application range. The prepared material has high purity and high crystallinity, and is easy to ensure large-scale production of sodium vanadium phosphate/carbon positive electrode composite material for sodium ion batteries. DETAILED DESCRIPTION - Synthesizing sodium vanadium phosphate/carbon (Na3V2(PO4)3/C) cathode composite material using rapid high-temperature thermal shock method involves (S1) adding vanadium source compound, sodium source compound, phosphorus source compound, carbon source (A), carbon source (B) and dispersant in ball mill jar, and feeding in planetary ball mill for solid-phase ball milling, and feeding in vacuum drying oven for vacuum drying, and grinding dried powder to obtain sodium vanadium phosphate/carbon (Na3V2(PO4)3/C) precursor powder, and (S2) performing rapid high-temperature thermal shock on Na3V2(PO4)3/C precursor in inert atmosphere or reducing atmosphere. The carbon source (A) comprises one or more of oxalic acid, glucose, sucrose, ascorbic acid, malic acid, folic acid and maltose. The carbon source (B) comprises one or more of glucose, sucrose, citric acid, malic acid, ascorbic acid, maltose, adipic acid, ethylene glycol, Ketjen black, acetylene black, superp(RTM: carbon black), graphene oxide and carbon nanotubes. The molar ratio of vanadium source compound, sodium source compound and phosphorus source compound is 2.85-3.15:2:3 based on sodium, vanadium and phosphorus elements. The molar ratio of carbon source (A) and vanadium source compound is 0.3-9:1. The molar ratio of carbon source (B) and vanadium source compound is 0.15-4:1.