Abstract
An ecofriendly cobalt-free O3-Na[Ni1/3Mn1/3Fe1/3]O2 (NNMF) embedded on conductive polyaniline (PANI) backbones is synthesized as a hybrid cathode by a facile chemical polymerization technique. As a cathode for rechargeable sodium ion batteries (RSIB), the NNMF with the 0.3 M PANI (NNMF-PANI3) hybrid electrode displays an enhanced energy density of 567 Wh kg–1 at a high operating voltage of 2–4.5 V along with excellent cyclic performance. In addition, the NNMF-PANI3 hybrid electrode exhibits ∼75% capacity retention after 750 cycles at 2 A g–1 current density within 2–4.5 V. Conversely, the pristine NNMF electrode without PANI fails to demonstrate adequate electrochemical performance even in a low cut-off voltage range (2–4.2 V). The superior electrochemical performance of the hybrid electrode is attributed to effective Na-ion transportation within the hybrid structure in which PANI keeps the NNMF particles interconnected uniformly and offers better conductive contact between the electrolyte and the active ...
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