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P2-Na0.67Mn0.85Al0.15O2 and NaMn2O4 Blend as Cathode Materials for Sodium-Ion Batteries Using a Natural β-MnO2 Precursor

Abstract : Sodium-ion batteries (NIBs) are promising candidates for specific stationary applications considering their low-cost and costeffective energetic property compared to lithium-ion batteries (LIBs). Additional cost cutbacks are achievable by employing natural materials as active cathode materials for NIBs. In this work, we report the use of natural pyrolusite (β-MnO 2) as a precursor for the synthesis of a NaMnO blend (a mixture of layered P2-Na 0.67 Mn 0.85 Al 0.15 O 2 without any doping technique combined with a post-spinel NaMn 2 O 4 without any highpressure synthesis). The synthesized powder was characterized by XRD, evidencing these two phases, along with two additional phases. Tests for Na-ion insertion registered a reversible discharge capacity of 104 mA h/g after 10 cycles with a well-defined plateau at 2.25 V. After 500 cycles at a C/4 current density, a high Coulombic efficiency between 96 and 99% was achieved, with an overall 25% capacity retention loss. These pilot tests are encouraging; they provide economic relief since the natural material is abundant (low-cost). Desirable, energetic assurances and ecological confirmations are obtainable if these materials are implemented in large-scale stationary applications. The synthesis technique does not use any toxic metals or toxic solvents and has limited side product formation.
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Submitted on : Wednesday, June 9, 2021 - 3:28:28 PM
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John Abou-Rjeily, Ilham Bezza, Noureddine Laziz, Daniela Neacsa, Cecile Autret-Lambert, et al.. P2-Na0.67Mn0.85Al0.15O2 and NaMn2O4 Blend as Cathode Materials for Sodium-Ion Batteries Using a Natural β-MnO2 Precursor. ACS Omega, ACS Publications, 2021, 6, pp.1064 - 1072. ⟨10.1021/acsomega.0c01647⟩. ⟨hal-03255468⟩

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