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Reversible Intercalation of 1‐Ethyl‐3‐methylimidazolium Cations into MoS2 from a Pure Ionic Liquid Electrolyte for Dual‐Ion Cells
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-11-30 , DOI: 10.1002/celc.201801583 Jiaxin Fan 1 , Qiangqiang Xiao 1 , Yaobing Fang 1 , Li Li 2 , Wanyi Feng 1 , Wenhui Yuan 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-11-30 , DOI: 10.1002/celc.201801583 Jiaxin Fan 1 , Qiangqiang Xiao 1 , Yaobing Fang 1 , Li Li 2 , Wanyi Feng 1 , Wenhui Yuan 1
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Herein, we present a novel dual‐ion cell with a molybdenum disulfide (MoS2) anode, a graphite cathode, and a pure 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide (EMImTFSI) electrolyte. During charging, the EMIm+ cations intercalate into the anode‘s MoS2 interlayers and the TFSI− anions synchronously penetrate into the cathode‘s graphite lattice. During discharging, both the cations and anions deintercalate from the electrodes. The reversible intercalation of EMIm+ into MoS2 is systematically evaluated by cyclic voltammetry, galvanostatic cycling, XRD, Raman, and SEM tests. The results reveal that within 0.5–3.6 V and at 0.5 C, the batteries present a high medium discharge plateau of ∼2.5 V, a decent discharge capacity of 77.0 mAh g−1, and a good energy density of 175.6 Wh kg−1; at 4 C, the cells exhibit a superior cyclability with 84.3 % capacity retention for 300 cycles and a high Coulombic efficiency of 96.1 %. Electrode characterizations indicate that both the MoS2 anode and the graphite cathode display a high stability over a long‐term cycling process. This novel cell configuration opens a new avenue to further develop promising rechargeable dual‐ion energy storage systems.
中文翻译：
从纯离子液体电解质中将1-乙基-3-甲基咪唑鎓阳离子可逆插入MoS2中以用于双离子电池
在本文中，我们介绍了一种新型的双离子电池，该电池具有二硫化钼（MoS 2）阳极，石墨阴极和纯的1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺（EMImTFSI）电解质。在充电期间，EMIM +阳离子嵌插到阳极的的MoS 2夹层和TFSI -阴离子同步渗透到阴极的石墨晶格。在放电期间，阳离子和阴离子都从电极脱嵌。EMIm +到MoS 2的可逆嵌入通过循环伏安法，恒电流循环，XRD，拉曼和SEM测试进行系统评估。结果表明，在0.5–3.6 V和0.5 C的温度下，电池呈现出约2.5 V的高中压放电平稳期，体面的放电容量为77.0 mAh g -1，良好的能量密度为175.6 Wh kg -1；在4 C下，这些电池具有出色的可循环性，在300个循环中的容量保持率为84.3％，高库仑效率为96.1％。电极特性表明，MoS 2阳极和石墨阴极在长期循环过程中均显示出高稳定性。这种新颖的电池配置为进一步开发有前途的可充电双离子储能系统开辟了一条新途径。
更新日期：2018-11-30
中文翻译：
从纯离子液体电解质中将1-乙基-3-甲基咪唑鎓阳离子可逆插入MoS2中以用于双离子电池
在本文中，我们介绍了一种新型的双离子电池，该电池具有二硫化钼（MoS 2）阳极，石墨阴极和纯的1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺（EMImTFSI）电解质。在充电期间，EMIM +阳离子嵌插到阳极的的MoS 2夹层和TFSI -阴离子同步渗透到阴极的石墨晶格。在放电期间，阳离子和阴离子都从电极脱嵌。EMIm +到MoS 2的可逆嵌入通过循环伏安法，恒电流循环，XRD，拉曼和SEM测试进行系统评估。结果表明，在0.5–3.6 V和0.5 C的温度下，电池呈现出约2.5 V的高中压放电平稳期，体面的放电容量为77.0 mAh g -1，良好的能量密度为175.6 Wh kg -1；在4 C下，这些电池具有出色的可循环性，在300个循环中的容量保持率为84.3％，高库仑效率为96.1％。电极特性表明，MoS 2阳极和石墨阴极在长期循环过程中均显示出高稳定性。这种新颖的电池配置为进一步开发有前途的可充电双离子储能系统开辟了一条新途径。
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