- Polyanion-carbon nanofibers composites for positive electrode materials of lithium ion batteries using electrospinning and preparing method thereof

摘要

The present invention relates to a positive electrode active material for a lithium secondary battery, which has enhanced electrochemical characteristics and a novel structure while including lithium vanadium phosphate (Li_3V_2(PO_4)_3), being a polycyanate anion material, embedded in the carbon nanofibers by using an electrospinning method, and a preparing method thereof. More specifically, the preparing method includes the steps of: 1) preparing lithium vanadium phosphate precursor-polymer nanofibers by using the electrospinning method; and 2) executing a calcination operation under controlled conditions to form the lithium vanadium phosphate (Li_3V_2(PO_4)_3). The lithium vanadium phosphate-carbon nanofiber composite can overcome the limitations of low conductivity with secured electronic conduction channels, reduce the diffusion distance of lithium ions by enabling the nano-scale positive electrode material protruding from the nanofibers come in direct contact with the electrolyte in the battery, and enhance the conductivity of the lithium ions by eliminating the resistance of conventional carbon coating layers, and have enhanced electrochemical characteristics.