Process for producing lithium vanadium phosphate-carbon composite

A process for producing a lithium vanadium phosphate-carbon composite that includes lithium vanadium phosphate having a NASICON structure, and a conductive carbon material, the process comprising:

• a first step that includes mixing a lithium source, a tetravalent or pentavalent vanadium compound, a phosphorus source, and a conductive carbon material source that produces carbon through pyrolysis, in an aqueous solvent to prepare a raw material mixture;
• a second step that includes heating the raw material mixture to 60 to 100° C. to effect a precipitation reaction to obtain a reaction mixture that includes a precipitate;
• a third step that includes subjecting the reaction mixture that includes the precipitate to wet grinding using a media mill to obtain a slurry that includes ground particles;
• a fourth step that includes spray-drying the slurry that includes the ground particles to obtain a reaction precursor;
• and
• a fifth step that includes calcining the reaction precursor at 600 to 1300° C. in an inert gas atmosphere or a reducing atmosphere,
• the phosphorus source being at least one phosphorus source selected from phosphoric acid, polyphosphoric acid, phosphoric anhydride, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, and ammonium phosphate, and
• the precipitate including at least lithium phosphate and vanadium hydrogen phosphate.