Guji Kefyalew Wagari, Chien Wen-Chen, Wang Fu-Ming, Ramar Alagar, Chemere Endazenaw Bizuneh, Tiong Lester, Merinda Laurien
Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City 243, Taiwan.
Nanomaterials (Basel). 2021 Nov 19;11(11):3120. doi: 10.3390/nano11113120.
In this study we prepared potassium-ion batteries (KIBs) displaying high output voltage and, in turn, a high energy density, as replacements for lithium-ion batteries (LIBs). Organic electrode materials featuring void spaces and flexible structures can facilitate the mobility of K to enhance the performance of KIBs. We synthesized potassium maleamate (K-MA) from maleamic acid (MA) and applied as an anode material for KIBs and LIBs, with 1 M potassium bis(fluorosulfonyl)imide (KFSI) and 1 M lithium bis(fluorosulfonyl)imide (LiFSI) in a mixture of ethylene carbonate and ethyl methyl carbonate (1:2, /) as respective electrolytes. The K-MA_KFSI anode underwent charging/discharging with carbonyl groups at low voltage, due to the K···O bond interaction weaker than Li···O. The K-MA_KFSI and K-MA_LiFSI anode materials delivered a capacity of 172 and 485 mA h g after 200 cycles at 0.1C rate, respectively. K-MA was capable of accepting one K in KIB, whereas it could accept two Li in a LIB. The superior recoveries performance of K-MA_LiFSI, K-MA_KFSI, and Super P_KFSI at rate of 0.1C were 320, 201, and 105 mA h g, respectively. This implies the larger size of K can reversibly cycling at high rate.
在本研究中，我们制备了具有高输出电压进而具有高能量密度的钾离子电池（KIBs），以替代锂离子电池（LIBs）。具有空隙空间和柔性结构的有机电极材料可促进钾离子的迁移，从而提高钾离子电池的性能。我们由马来酰胺酸（MA）合成了马来酸钾（K-MA），并将其用作钾离子电池和锂离子电池的负极材料，分别以1 M双（氟磺酰）亚胺钾（KFSI）和1 M双（氟磺酰）亚胺锂（LiFSI）溶解在碳酸亚乙酯和碳酸甲乙酯的混合溶剂（1:2，v/v）中作为电解质。由于K···O键相互作用比Li···O弱，K-MA_KFSI负极在低电压下通过羰基进行充放电。K-MA_KFSI和K-MA_LiFSI负极材料在0.1C倍率下循环200次后，容量分别为172和485 mA h g。K-MA在钾离子电池中能够接受一个钾离子，而在锂离子电池中能够接受两个锂离子。K-MA_LiFSI、K-MA_KFSI和Super P_KFSI在0.1C倍率下的优异恢复性能分别为320、201和105 mA h g。这意味着较大尺寸的钾离子能够在高倍率下可逆循环。
