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Sodium-ion batteries now become a strong alternative candidate for lithium-ion batteries due to abundant Na resources, and organic electrode active materials for sodium-ion batteries also have possibi...lity to bring additional cost reduction. Although many organic-based active materials have been researched as cathode materials for lithium-ion batteries, few works have been conducted for sodium-ion batteries. In this study, the cathode properties of several organic compounds of sodium rhodizonate analogs, Na_2C_xO_x [x = 4 and 5] and K_2C_6O_6 were newly investigated. Among them, it was revealed that Na_2C_5O_5 and Na_2C_6O_6 deliver large first discharge capacity close to 200 mAh g_-1 and exhibit reversible sodium insertion/de-insertion of 1.35 and 1.25Na, respectively, with good cycle performance.show more
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