Capacitive vs Faradaic Energy Storage in a Hybrid Cell with LiFePO4/RGO Positive Electrode and Nanocarbon Negative Electrode
Dubal, Deepak P.
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We report an advanced device based on a Nitrogen-doped Carbon Nanopipes (N-CNP) negative electrode and a lithium iron phosphate(LiFePO4) positive electrode. We carefully balanced the cell composition (charge balance) and suppressed the initial irreversiblecapacity of the anode in the round of few cycles. We demonstrated an optimal performance in terms of specific capacity 170 mAh/g ofLiFePO4with energy density of about 203 Wh kg−1and a stable operation for over 100 charge−discharge cycles. The components ofthis device (combining capacitive and faradaic electrodes) are low cost and easily scalable. This device has a performance comparableto those offered by the present technology of LIBs with the potential for faster charging; hence, we believe that the results disclosedin this work may open up new opportunities for energy storage devices.