Crystallization behavior and electrochemical properties of Na2FeyMn1−yP2O7 glass
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Abstract
Abstract Crystallization behavior of Na2FeyMn1 − -yP2O7 glass prepared by conventional melt-quenching method was examined. And its electrical conductivity and electrochemical properties are also examined. Less than y = 0.25 layered type triclinic phase formed as main phase by heat-treatment at crystallization temperature. The other composition triclinic β phase mainly precipitated. By further heat-treatment up to 650 °C, crystalline phase completely transformed to beta phase in all composition. For the reversible discharge capacity of Na2FeyMn1 − yP2O7 increased by increase of the FeO substitution in both glassy state and glass-ceramics. It is found that Mn3 +/Mn2 + redox reaction in Na2Fe0.25Mn0.75P2O7 glass-ceramic cathode is activated and higher voltage plateau appeared at 3.8 V.
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Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Transition Metal Oxide Nanomaterials
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