ZnFe₂O₄‐C/LiFePO₄‐CNT: A Novel High‐Power Lithium‐Ion Battery with Excellent Cycling Performance

Abstract

An innovative and environmentally friendly battery chemistry is proposed for high power applications. A carbon‐coated ZnFe 2 O 4 nanoparticle‐based anode and a LiFePO 4 ‐multiwalled carbon nanotube‐based cathode, both aqueous processed with Na‐carboxymethyl cellulose, are combined, for the first time, in a Li‐ion full cell with exceptional electrochemical performance. Such novel battery shows remarkable rate capabilities, delivering 50% of its nominal capacity at currents corresponding to ≈20C (with respect to the limiting cathode). Furthermore, the pre‐lithiation of the negative electrode offers the possibility of tuning the cell potential and, therefore, achieving remarkable gravimetric energy and power density values of 202 Wh kg −1 and 3.72 W kg −1 , respectively, in addition to grant a lithium reservoir. The high reversibility of the system enables sustaining more than 10 000 cycles at elevated C‐rates (≈10C with respect to the LiFePO 4 cathode), while retaining up to 85% of its initial capacity.