NaFSA–C1C3pyrFSA ionic liquids for sodium secondary battery operating over a wide temperature range

Ding, Changsheng; Nohira, Toshiyuki; Kuroda, Keisuke; Hagiwara, Rika; Fukunaga, Atsushi; Sakai, Shoichiro; Nitta, Koji; Inazawa, Shinji

doi:10.1016/j.jpowsour.2013.03.089

Cited by 138 publications

(130 citation statements)

References 26 publications

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“…24,28 The positive electrode was prepared by mixing Na 2-x Fe 1+x/2 P 2 O 7 , acetylene black and polytetrafluoroethylene in a weight ratio of 75:20:5. The mass loading and thickness of the active material were around 2.0 mg cm -2 and 50 μm, respectively.…”

Section: Methodsmentioning

confidence: 99%

Full Utilization of Superior Charge-Discharge Characteristics of Na_1.56Fe_1.22P₂O₇Positive Electrode by Using Ionic Liquid Electrolyte

Chen

Matsumoto

Hagiwara

2014

J. Electrochem. Soc.

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Na 1.56 Fe 1.22 P 2 O 7 was synthesized via a conventional solid-state method and evaluated as a positive electrode for Na secondary batteries using Na [FSA]-[C 3 C 1 pyrr][FSA] (C 3 C 1 pyrr = N-methyl-N-propylpyrrolidinium and FSA = bis(fluorosulfonyl)amide) ionic liquids (IL) as electrolytes, over the temperature range of 298-363 K. A reversible capacity as high as 108 mAh g -1 has been achieved for the first time with a thermally stable IL at 363 K. This value is close to the theoretically calculated capacity of 118 mAh g −1 and is significantly higher than the previously reported values of ca. 85 mAh g −1 in organic electrolytes at 298 K. The capacity of 108 mAh g −1 also exceeds the value obtained for Na 2 FeP 2 O 7 electrodes (94 mAh g −1 ) under the same experimental conditions. Moreover, excellent rate capability and superior cyclability exceeding 3000 cycles have been achieved by using the IL electrolyte over a wide temperature range of 298-363 K. Recently, it has been recognized that Na secondary batteries can offer a performance comparable to that of Li batteries, at a more reasonable cost.1,2 Developing commercial Na secondary batteries that are economically viable, safe, and have a long life will definitely require the development of new electrode materials and electrolytes. Layered oxides in the form of Na x MO 2 (where M is a transition metal) have been extensively tested as Na host materials, 4-8 and some of the oxides have exhibited considerably high Na storage capacities by suitably tailoring the stoichiometric ratio of Na to M.6-8 However, most of these materials undergo complicated phase transitions during cycling 4-6 and may result in limited cyclability, 5-7 which is an obstacle for practical applications. 8In order to overcome such limitations in electrode performance, phosphate-based framework materials have been proposed as positive electrode materials in Na secondary batteries. [9][10][11][12][13][14][15][16] The robust framework undergoes a topotactic Na insertion/extraction reaction with a small volume change upon electrochemical cycling. Among them, pyrophosphates (Na 2 MP 2 O 7 , where M = Fe, Mn, or Co) have attracted interest owing to their favorable electrochemical activity and good thermal stability.10-16 However, they are less appealing in terms of theoretical capacity (ca. 97 mAh g −1 , 1 Na per formula unit) as compared to layered oxides (ca. 120 mAh g −1 , 0.5 Na per formula unit), owing to the presence of the P 2 O 7 units that induce a weight penalty.Recently, Na 2-x Fe 1+x/2 P 2 O 7 compounds (where, 0 < x < 0.44) were synthesized and evaluated as positive electrodes for Na secondary batteries using organic electrolytes at room temperature. 17,18The substitution of Na with Fe would directly influence the active Na sites and the coordination environment of the redox center, resulting in distinct electrochemical characteristics. Notably, the theoretical capacity for the extreme stoichiometric composition, Na 1.56 Fe 1.22 P 2 O 7 (x = 0.44), is estimated to be increased to ...

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Section: Methodsmentioning

confidence: 99%

Full Utilization of Superior Charge-Discharge Characteristics of Na_1.56Fe_1.22P₂O₇Positive Electrode by Using Ionic Liquid Electrolyte

Chen

Matsumoto

Hagiwara

2014

J. Electrochem. Soc.

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“…[1][2][3][4][5][6][7][8][9][10][11] Sodium is abundant in the crust and seawater, showing a relatively low standard redox potential (¹2.71 V vs. SHE). Thus, batteries with low cost and high energy density can be constructed.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, ionic liquids are inherently safe due to their negligible volatility and non-flammability, with some of them showing reasonably high ionic conductivities and wide electrochemical windows. 5,6 We have already reported that Na[TFSA]-Cs[TFSA] (TFSA = bis(trifluoromethylsulfonyl)amide) and Na[FSA]-K[FSA] (FSA = bis(fluorosulfonyl)amide) ionic liquids are promising electrolytes for sodium secondary batteries operating at an intermediate temperature range (>353 K). [1][2][3][4] However, these salts are solid at room temperature, while electrolytes with lower melting points are more desirable for the construction of batteries for a wide range of practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we developed a new electrolyte, Na [FSA]-[C 3 C 1 pyrr][FSA] (C 3 C 1 pyrr = N-methyl-N-propylpyrrolidinium), that is a liquid in a wide temperature range, including room temperature. 5,6 For example, several positive electrode materials like We have also investigated the charge-discharge behavior of hard carbon (HC) negative electrodes in this ionic liquid at 363 K. 10,11 HC is mainly composed of two structural domains, i.e., randomly-arranged graphene domains and their interstitial sites (pores), and its charge-discharge behavior as a negative electrode material for sodium secondary batteries has been well investigated in organic solvent electrolytes. [12][13][14][15][16][17][18][19][20] However, there have been few studies on the correlation of HC structure and its electrochemical behavior in ionic liquid electrolytes.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Electrochemical Properties of Hard Carbon Negative Electrodes for Sodium Secondary Batteries Using the Na[FSA]–[C<sub>3</sub>C<sub>1</sub>pyrr][FSA] Ionic Liquid Electrolyte

et al. 2017

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Two kinds of hard carbon (HC) were investigated as negative electrodes for sodium secondary batteries using Na[FSA]-[C 3 C 1 pyrr][FSA] as an ionic liquid electrolyte at 363 K. The structural properties of HCs were studied by X-ray diffraction (XRD), Raman spectroscopy, small-angle X-ray scattering (SAXS), and field-emission scanning electron microscopy (FE-SEM). The interlayer distance between graphene sheets and the pore size were different for these HCs. Potential slope and plateau regions were observed in charge-discharge curves, which is typical for HC negative electrodes. More detailed examinations revealed that the HC with a larger interlayer distance showed higher capacity in the slope region, while that with a larger pore size exhibited a higher capacity in the plateau region. Finally, the rate capabilities and cycling properties of HC negative electrodes were evaluated.

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“…15 In addition, we have shown that the ionic liquid, Na[FSA]-[C 3 C 1 pyrr][FSA], has high ionic conductivity and a wide electrochemical window, and is thus a promising electrolyte for use in sodium secondary batteries. 16 It is expected that a sodium secondary battery based on the Na …”

Section: Introductionmentioning

confidence: 99%

Charge-discharge Performance of an Ionic Liquid-based Sodium Secondary Battery in a Wide Temperature Range

2015

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A sodium secondary battery has been constructed by using a nonvolatile and nonflammable Na[FSA]-[C 3 C 1 pyrr][FSA] (FSA = bis(fluorosulfonyl)amide, C 3 C 1 pyrr = N-methyl-N-propylpyrrolidinium) ionic liquid, a NaCrO 2 positive electrode and a Na metal negative electrode. The charge-discharge performance is evaluated over a wide temperature range of −20-90°C. It has been demonstrated that the sodium secondary battery has long cycle lives both at a high temperature of 90°C and at a low temperature of 0°C. Thus, the ionic liquid-based sodium secondary battery is expected to be a viable alternative to lithium ion battery for many applications.

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NaFSA–C1C3pyrFSA ionic liquids for sodium secondary battery operating over a wide temperature range

Cited by 138 publications

References 26 publications

Full Utilization of Superior Charge-Discharge Characteristics of Na_1.56Fe_1.22P₂O₇Positive Electrode by Using Ionic Liquid Electrolyte

Full Utilization of Superior Charge-Discharge Characteristics of Na_1.56Fe_1.22P₂O₇Positive Electrode by Using Ionic Liquid Electrolyte

Structural and Electrochemical Properties of Hard Carbon Negative Electrodes for Sodium Secondary Batteries Using the Na[FSA]–[C<sub>3</sub>C<sub>1</sub>pyrr][FSA] Ionic Liquid Electrolyte

Charge-discharge Performance of an Ionic Liquid-based Sodium Secondary Battery in a Wide Temperature Range

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NaFSA–C1C3pyrFSA ionic liquids for sodium secondary battery operating over a wide temperature range

Cited by 138 publications

References 26 publications

Full Utilization of Superior Charge-Discharge Characteristics of Na1.56Fe1.22P2O7Positive Electrode by Using Ionic Liquid Electrolyte

Full Utilization of Superior Charge-Discharge Characteristics of Na1.56Fe1.22P2O7Positive Electrode by Using Ionic Liquid Electrolyte

Structural and Electrochemical Properties of Hard Carbon Negative Electrodes for Sodium Secondary Batteries Using the Na[FSA]&ndash;[C<sub>3</sub>C<sub>1</sub>pyrr][FSA] Ionic Liquid Electrolyte

Charge-discharge Performance of an Ionic Liquid-based Sodium Secondary Battery in a Wide Temperature Range

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Full Utilization of Superior Charge-Discharge Characteristics of Na_1.56Fe_1.22P₂O₇Positive Electrode by Using Ionic Liquid Electrolyte

Full Utilization of Superior Charge-Discharge Characteristics of Na_1.56Fe_1.22P₂O₇Positive Electrode by Using Ionic Liquid Electrolyte

Structural and Electrochemical Properties of Hard Carbon Negative Electrodes for Sodium Secondary Batteries Using the Na[FSA]–[C<sub>3</sub>C<sub>1</sub>pyrr][FSA] Ionic Liquid Electrolyte