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Caption : fig. s1 full spectrum of xps for positive tabs.

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Caption : fig. s2 n2 adsorption/desorption isotherm curve and pore-size distribution of kb.

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Caption : fig. s2 n2 adsorption/desorption isotherm curve and pore-size distribution of kb.

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Caption : fig. s4 anode photos of kb battery (left) and kb-p60 battery (right) after charge and discharge cycle at 20 a g-1 current density.

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Caption : fig. s5 before and after the polyiodide solution is captured by pva