An eco-friendly Na-ion battery utilizing biowaste-derived carbon and birnessite with enhanced high voltage reaction

EcoEnergy Pub Date : 2024-11-01 DOI:10.1002/ece2.77

Gregorio F. Ortiz, Ruqin Ma, Mingzeng Luo, Li Yixiao, He Zhanning, Yu Su, Jiale Huang, Yong Yang, Zhanhua Wei

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Abstract

Trigonal birnessite (Na_0.5MnO₂·0.7H₂O) with quasi-hexagonal-stacked particles is synthesized by a simple procedure. The MnO₆ layers are expanded (ca. 7.1 Å as confirmed by HRTEM) by sodium ion and water molecules permitting the cyclability of the cathode up to 4.4 V without anionic redox effect. This particular phase exhibits sodium storage performance with 181.2 mA h g⁻¹ reversible capacity, high Coulombic efficiency (99.8%), good rate performance (20–640 mA g⁻¹), and 80% capacity retention over 200 cycles. X-ray adsorption near-edge structure (XANES) spectra at Mn-k edge confirmed that the main redox component is Mn³⁺/Mn⁴⁺. An environmental-friendly Na-ion full cell is assembled with this cathode and biowaste-derived carbon (obtained from trash of lemon peels) anode and provided ∼ 330 Wh kg⁻¹ energy density (at the material's level) which is preserved at ∼71% over 200 cycles. Manganese, sodium, and carbon are cheap and eco-friendly materials for practical energy storage eagerly sought after in the industry.

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EcoEnergy

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