Exploring sold matrix allowing multi-valence redox reaction

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Pursuing eco-efficient sustainable synthesis, we have designed a two- step‘splash combustion synthesis (CS)’ method to obtain Fe(II)- based positive-electrodes starting with cheap Fe(III) precursors. As a proof-of-concept test, we can produce phase-pure nanoscale, carbon-coated Li2FeP2O7 in just 1 minute, delivering excellent electrochemical performance. CS forms a novel economical and energy-savvy route to form excellent Fe-based polyanionic positive- electrode compounds. Using this method, we have efficiently screened the related compounds and establish the materials group can provide both of high voltage and high safety, which are usually in trade-off. Activity of some oxalate compounds are also discovered.