Reversible electrochemical potassium-ion intercalation in P2-type Na_xCoO₂ was examined for the first time. Hexagonal Na_0.84CoO₂ platelets prepared by a solution combustion synthesis technique were found to work as an efficient host for K⁺ intercalation. They deliver a high reversible capacity of 82 mA h g⁻¹, good rate capability and excellent cycling performance up to 50 cycles.

中文翻译：

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Na _x CoO _2中的电化学钾离子嵌入：一种新型的钾离子电池正极材料

首次检查了P2型Na _x CoO ₂中可逆的电化学钾离子嵌入。发现通过溶液燃烧合成技术制备的六角形Na _0.84 CoO ₂血小板可作为K ⁺嵌入的有效基质。它们具有高达82 mA hg ^-1的高可逆容量，良好的倍率能力以及长达50个循环的出色循环性能。