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Comparative Study of M[N(SO2F)(SO2CF3)]-[N-Butyl-N-methylpyrroridinium][N(SO2F)(SO2CF3)] (M = Li, Na, K, Rb, Cs) Ionic Liquid Electrolytes.
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.jpcb.0c06578 Takayuki Yamamoto 1 , Shu Nishijima 1 , Toshiyuki Nohira 1
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.jpcb.0c06578 Takayuki Yamamoto 1 , Shu Nishijima 1 , Toshiyuki Nohira 1
Affiliation
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We systematically evaluated the physicochemical properties of a series of M[FTA]–[C4C1pyrr][FTA] ionic liquids (ILs) (M = alkali metal, FTA = (fluorosulfonyl)(trifluoromethylsulfonyl)amide, C4C1pyrr = N-butyl-N-methylpyrrolidinium) as electrolytes for alkali metal-ion batteries. First, the viscosity (η), ionic conductivity (σ), and density (ρ) of the M[FTA]–[C4C1pyrr][FTA] ILs at x(M[FTA]) = 0.20 (x(M[FTA]) = molar fraction of M[FTA]) were measured. The σ values ranged from 1–3 mS cm–1 at 298 K and increased as follows: Na < Li < K < Rb < Cs, which indicated that the Li-based IL did not obey the trend predicted by the charge densities of alkali metal cations. Second, the Li-based IL exhibited slightly lower vertical intercept values than the other FTA-based ILs in the Walden plots obtained using the results of η, σ, and ρ measurements. Third, the electrochemical stability of the ILs was investigated by cyclic voltammetry, and the redox potentials of the alkali metals (E(M+/M)) were determined. The E(M+/M) values of the FTA-based ILs increased as follows: Cs < Rb < K < Li < Na. Subsequently, we compared the obtained E(M+/M) values with those of other general electrolytes, such as propylene carbonate (PC)-based electrolytes and aqueous solutions. The trend in E(M+/M) values of the FTA-based ILs was similar to that of PC-based electrolytes and was significantly different from that of aqueous solutions. In particular, the FTA- and FSA-based ILs (FSA = bis(fluorosulfonyl)amide) presented the most negative E(Na+/Na) and E(K+/K) values among various electrolytes, which indicated that utilization of these IL electrolytes for the development of Na- and K-ion batteries would present significant advantages.
中文翻译：
M [N（SO2F）（SO2CF3）]-[N-丁基-N-甲基吡咯烷鎓] [N（SO2F）（SO2CF3）]（M = Li，Na，K，Rb，Cs）离子液体电解质的比较研究。
我们系统地评估了一系列M [FTA] – [C 4 C 1 pyrr] [FTA]离子液体（ILs）的理化性质（M =碱金属，FTA =（氟磺酰基）（三氟甲基磺酰基）酰胺，C 4 C 1 pyrr = N-丁基-N-甲基吡咯烷鎓）作为碱金属离子电池的电解质。首先，在x（M [FTA]）处M [FTA] – [C 4 C 1 pyrr] [FTA] ILs的粘度（η），离子电导率（σ）和密度（ρ ）= 0.20（x（ M [FTA]）＝ M [FTA]）的摩尔分数。σ值范围为1–3 mS cm –1在298 K时，Na ＜Li ＜K ＜Rb ＜Cs增大，这表明基于Li的IL没有遵循碱金属阳离子的电荷密度所预测的趋势。其次，在使用η，σ和ρ测量结果获得的Walden图中，基于Li的IL表现出比其他基于FTA的IL略低的垂直截距值。第三，通过循环伏安法研究了离子液体的电化学稳定性，并确定了碱金属的氧化还原电位（E（M + / M））。基于FTA的IL的E（M + / M）值增加如下：Cs <Rb <K <Li <Na。随后，我们比较了获得的E（M +/ M）值与其他一般电解质（例如，基于碳酸亚丙酯（PC）的电解质和水溶液）的值相同。基于FTA的IL的E（M + / M）值趋势类似于基于PC的电解质，并且与水溶液的趋势明显不同。尤其是，基于FTA和FSA的IL（FSA =双（氟磺酰基）酰胺）在各种电解质中呈现出最负的E（Na + / Na）和E（K + / K）值，这表明这些电解质的利用率用于开发Na和K离子电池的IL电解质将具有明显的优势。
更新日期：2020-09-24
中文翻译：
M [N（SO2F）（SO2CF3）]-[N-丁基-N-甲基吡咯烷鎓] [N（SO2F）（SO2CF3）]（M = Li，Na，K，Rb，Cs）离子液体电解质的比较研究。
我们系统地评估了一系列M [FTA] – [C 4 C 1 pyrr] [FTA]离子液体（ILs）的理化性质（M =碱金属，FTA =（氟磺酰基）（三氟甲基磺酰基）酰胺，C 4 C 1 pyrr = N-丁基-N-甲基吡咯烷鎓）作为碱金属离子电池的电解质。首先，在x（M [FTA]）处M [FTA] – [C 4 C 1 pyrr] [FTA] ILs的粘度（η），离子电导率（σ）和密度（ρ ）= 0.20（x（ M [FTA]）＝ M [FTA]）的摩尔分数。σ值范围为1–3 mS cm –1在298 K时，Na ＜Li ＜K ＜Rb ＜Cs增大，这表明基于Li的IL没有遵循碱金属阳离子的电荷密度所预测的趋势。其次，在使用η，σ和ρ测量结果获得的Walden图中，基于Li的IL表现出比其他基于FTA的IL略低的垂直截距值。第三，通过循环伏安法研究了离子液体的电化学稳定性，并确定了碱金属的氧化还原电位（E（M + / M））。基于FTA的IL的E（M + / M）值增加如下：Cs <Rb <K <Li <Na。随后，我们比较了获得的E（M +/ M）值与其他一般电解质（例如，基于碳酸亚丙酯（PC）的电解质和水溶液）的值相同。基于FTA的IL的E（M + / M）值趋势类似于基于PC的电解质，并且与水溶液的趋势明显不同。尤其是，基于FTA和FSA的IL（FSA =双（氟磺酰基）酰胺）在各种电解质中呈现出最负的E（Na + / Na）和E（K + / K）值，这表明这些电解质的利用率用于开发Na和K离子电池的IL电解质将具有明显的优势。
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