Microwave assisted ultra-fast method to synthesize carbonate-phosphates, Na3MCO3PO4 (M = Mn, Fe, Co, Ni) - relevant materials applied in sodium-ion batteries
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Universidade Federal de Minas Gerais
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Although largely used in mobiles and electric vehicles applications, insertion batteries based on Li-ion technology are high-cost devices. These applications require high-performance energy storage systems with high-energy and high-power densities, which are better attained by Li-ion technology. However, stationary applications such as power plants and uninterruptible power supplies (UPS) mainly require low-cost energy storage devices. In this scenario Na-ion insertion batteries feature as a cheaper option for such applications. Among the several compounds for use as cathode in Na-batteries, a largely studied class of compounds are the sodium-carbonate-phosphates, Na3MCO3PO4 (M = Mn, Fe, Co or Ni), with structure analogue to the mineral sidorenkite. In this work, it was developed a new microwave-assisted hydrothermal method as an ultra-fast way to prepare sodium-carbonate-phosphate compounds. This methodology results in high-quality materials with general formula Na3MCO3PO4 (M = Mn, Fe, Co or Ni) upon only 5 min processing time. Characterization techniques indicate highly ordered materials with sidorenkite-like phase and different morphologies or crystal habits, including plates, rods, and a ‘starfruit’ shape. As a proof-of-application the Mn-based material was evaluated from electrochemical tests for Na+ insertion reactions. The obtained results evidence initial discharge capacity of 107 mA h g-¹ with good reversible capacity (65 mA h g -¹) after several charge/discharge cycles.
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Química analítica, Físico-química, Análise eletroquímica, Baterias, Minerais metálicos, Compostos de sódio, Rietveld, Método de, Raios X - Difração, Microscopia eletrônica de varredura, Análise térmica, Espectrometria de massa, Termogravimetria, Mossbauer, Espectroscopia de
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Microwave assisted, Carbonate-phosphates, Relevant materials applied in sodium-ion batteries, Sidorenkite, Sodium-ion insertion, Microwave, Solvothermal method
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https://jbcs.sbq.org.br/default.asp?ed=293