Hybrid LiMn2O4–radical polymer cathodes for pulse power delivery applications

Abstract Electrochemical performances of LiMn 2 O 4 (LMO) – poly (2,2,6,6-tetramethyl-1-piperinidyloxy-4-yl methacrylate) (PTMA) hybrid electrodes are investigated. Different constituent ratios are tested and the impact on the power and the cycling performances is discussed. Variable rate galvanostatic charge/discharge tests show improved energy-power performances and capacity retention of the hybrid LMO/PTMA electrodes when compared to pure LMO electrodes. This enhancement is correlated to a sequential power delivery mechanism by the fast kinetic component (PTMA) subsequently recharged by the high-energy constituent (LMO). Hybrid electrodes are shown to deliver higher energy and longer cycle life when subjected to power pulse tests. The combination of the PTMA power buffer component with the LMO high-energy sink proves the potential of the hybrid energy-power electrodes in pulsed discharge applications.