Improving electrochemical performance of Li3V2(PO4)3 in a thiophene-containing electrolyte

► In situ electropolymerization of thiophene in the conventional organic electrolyte improved Li3V2(PO4)3 cathode materials. ► The cathode materials exhibited higher reversible capacity and better rate performance. ► The addition of thiophene improved the deintercalation/intercalation of the third Li+ ion at high electrode potentials.