Dubey Romain J-C, Nüssli Jasmin, Piveteau Laura, Kravchyk Kostiantyn V, Rossell Marta D, Campanini Marco, Erni Rolf, Kovalenko Maksym V, Stadie Nicholas P
Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences , ETH Zürich , CH-8093 Zürich , Switzerland.
Department of Chemistry & Biochemistry , Montana State University , Bozeman , Montana 59717 , United States.
ACS Appl Mater Interfaces. 2019 May 15;11(19):17686-17696. doi: 10.1021/acsami.9b03886. Epub 2019 Apr 30.
Dual-ion batteries (DIBs) are electrochemical energy storage devices that operate by the simultaneous participation of two different ion species at the anode and cathode and rely on the use of an electrolyte that can withstand the high operation potential of the cathode. Under such conditions at the cathode, issues associated with the irreversible capacity loss and the formation of solid-electrolyte interphase at the surface of highly porous electrode materials are far less significant than at lower potentials, permitting the exploration of high surface area, permanently porous framework materials as effective charge storage media. This concept is investigated herein by employing zeolite-templated carbon (ZTC) as a cathode in a dual-ion battery based on a potassium bis(fluorosulfonyl)imide (KFSI) electrolyte. Anion (FSI) insertion within the pore network during electrochemical cycling is confirmed by NMR spectroscopy, and the maximum charge capacity is found to be proportional to surface area and micropore volume by comparison to other microporous carbon materials. Full cells based on ZTC as the cathode exhibit both high specific energy (up to 176 Wh kg, 79.8 Wh L) and high specific power (up to 3945 W kg, 1095 W L), stable cycling performance over hundreds of cycles, and reversibility within the potential range of 2.65-4.7 V versus K/K.
双离子电池（DIBs）是一种电化学储能装置，其工作原理是两种不同的离子物种同时在阳极和阴极参与反应，并依赖于使用能够承受阴极高工作电位的电解质。在阴极的这种条件下，与不可逆容量损失以及在高度多孔电极材料表面形成固体电解质界面相关的问题，远比在较低电位时要小得多，这使得探索高表面积、永久多孔骨架材料作为有效的电荷存储介质成为可能。本文通过在基于双（氟磺酰）亚胺钾（KFSI）电解质的双离子电池中采用沸石模板碳（ZTC）作为阴极来研究这一概念。通过核磁共振光谱证实了在电化学循环过程中阴离子（FSI）插入孔网络中，并且通过与其他微孔碳材料比较发现最大充电容量与表面积和微孔体积成正比。基于ZTC作为阴极的全电池表现出高比能量（高达176 Wh kg，79.8 Wh L）和高比功率（高达3945 W kg，1095 W L）、数百次循环的稳定循环性能以及相对于K/K在2.65 - 4.7 V电位范围内的可逆性。
