Potassium intercalation into graphite to realize high-voltage/high-power potassium-ion batteries and potassium-ion capacitors
Potassium intercalation into graphite to realize high-voltage/high-power potassium-ion batteries and potassium-ion capacitors
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DOI：
10.1016/j.elecom.2015.09.002
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发表时间：
2015-11-01
影响因子：
5.4
通讯作者：
Kubota, Kei
中科院分区：
文献类型：
--
作者：
Komaba, Shinichi;Hasegawa, Tatsuya;Kubota, Kei
在室温碳酸酯溶液中，通过电化学还原，在接近K ~+/K标准电位（低于Li ~+/Li标准电位）的电位下，实现了钾在石墨中的高度可逆插层。插层导致形成具有244 mAh g（-1）可逆容量的阶段-1 KC 8化合物。与聚偏二氟乙烯粘合剂相比，聚羧酸酯粘合剂抑制了初始不可逆容量。较低的电位，良好的循环性能，以及出色的倍率性能首次证明了储能应用。由于Li+、Na+、K+、Mg 2+和Ca 2+离子载体之间的最低电势和最弱的溶剂化，作为“钾离子电池”的两种插入材料之间的钾穿梭机制有利于更高电压/功率的可充电电池。优异的倍率性能有利于应用于混合型电容器，“钾离子电容器”，作为锂离子电容器的替代品。(C)2015 Elsevier B. V.版权所有。
Highly reversible potassium intercalation into graphite in carbonate ester solution at room temperature is achieved by electrochemical reduction at the potential approaching to K+/K standard potential which is lower than that of Li+/Li. The intercalation results in formation of stage-1 KC8 compound with delivering 244 mAh g(-1) of reversible capacity. The initial irreversible capacity is suppressed by polycarboxylate binder compared to poly(vinyledene fluoride) binder. The lower potential, good cyclability, and excellent rate capability are first demonstrated for energy storage applications. Because of the lowest potential and weakest solvation among Li+, Na+, K+, Mg2+, and Ca2+ ion carriers, potassium shuttlecock mechanism between two insertion materials as "potassium-ion battery" is advantageous for higher-voltage/-power rechargeable batteries. The excellent rate performance is beneficial for the application to hybrid-type capacitor, "potassium-ion capacitor," as an alternative to lithium-ion capacitors. (C) 2015 Elsevier B.V. All rights reserved.