Nanostructured spinel LiNi0.5Mn1.5O4 as new insertion anode for advanced Li-ion capacitors with high power capability

We demonstrate a novel Li-ion hybrid electrochemical capacitor (Li-HEC) assembled using 10 nanofibers of a high voltage spinet insertion electrode (LiNi0.5Mn1.5O4) and an activated carbon (AC) counter electrode in an organic electrolyte. A scalable electrospinning technique was employed to produce 10 nanofibers of the high voltage spinet electrode. Structural and morphological features of the nanofibers were studied using various characterization techniques. Performance of spinet and AC electrodes were evaluated in half-cell configurations with metallic Li. A Li-HEC assembly with optimized mass loading delivered a maximum energy density of similar to 19 Wh kg(-1) while retaining 81% of the initial value after 3000 cycles.