Physicochemical and Electrochemical Properties of K[N(SO2F)2]–[N-Methyl-N-propylpyrrolidinium][N(SO2F)2] Ionic Liquids for Potassium-Ion Batteries

Yamamoto, Takayuki; Matsumoto, Kazuhiko; Hagiwara, Rika; Nohira, Toshiyuki

doi:10.1021/acs.jpcc.7b06523

Cited by 76 publications

(117 citation statements)

References 63 publications

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“…To evaluate the thermal stability of KTFSA‐based ionic liquid, thermal gravimetric and differential thermal analyses (TG‐DTA) were performed. TG‐DTA curves for 0.5 M KTFSA/Pyr 13 TFSA under a nitrogen atmosphere are shown in Figure S2 with that of 0.5 M KFSA/Pyr 13 FSA which has recently been reported as a feasible electrolyte candidate for potassium‐ion (K‐ion) battery . Thermal decomposition temperatures (upon a 5 % loss in weight) are 690 K (417 °C) for 0.5 M KTFSA/Pyr 13 TFSA and 580 K (307 °C) for 0.5 M KFSA/Pyr 13 FSA, respectively, indicating that 0.5 M KTFSA/Pyr 13 TFSA ionic liquid is more advantageous in the high‐temperature operation of K‐ion batteries.…”

Section: Resultsmentioning

confidence: 99%

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

et al. 2019

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The world is at the cusp of a new era where pivotal importance is being attached to the development of sustainable and high‐performance energy storage systems. Potassium‐ion batteries are deemed not only cheap battery candidates, but also as the penultimate high‐voltage energy storage systems within monovalent‐cation chemistries. However, their performance and sustainability are undermined by the lack of suitable electrolytes for high‐voltage operation, particularly owing to the limited availability of cathode materials. Here, the potential of ionic liquids based on potassium bis(trifluoromethanesulfonyl)amide (KTFSA) as high‐voltage electrolytes is presented by assessing their physicochemical properties along with the electrochemical properties upon coupling with new high‐voltage layered cathode materials. These ionic liquids demonstrate a wide electrochemical window (around 6.0 V), making them feasible and safe electrolytes for the high‐voltage potassium‐ion battery configuration. This is proven by matching this electrolyte with new high‐voltage layered cathode compositions, demonstrating stable electrochemical performance. The present findings of electrochemically stable ionic liquids based on potassium bis(trifluoromethanesulfonyl)amide will bolster further advancement of high‐performance cathode materials, whose performance at high‐voltage regimes were apparently restricted by the paucity of suitable and compatible electrolytes.

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Section: Resultsmentioning

confidence: 99%

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

et al. 2019

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“…These layered cathode materials in the ionic liquid could demonstrate stable electrochemical properties even beyond 4 V. [79,197] Nohira et al proposed the physicochemical and electrochemical performance of K[N(SO 2 F) 2 ]-[N-Methyl-N-propylpyrrolidinium] [N(SO 2 F) 2 ] ionic liquids for KIBs. [201] This study revealed that the ionic conductivity of this electrolyte (4.8 mS cm −1 at 298 K) is higher than sodium-and lithium-based ionic liquids. Further, the electrochemical characterizations revealed that the K deposition/dissolution occurs at a more negative voltage as compared to Li and Na metal counterparts, implying that K-based ionic liquids can provide a higher working potential for KIB applications.…”

Section: Ionic Electrolytesmentioning

confidence: 75%

“…These layered cathode materials in the ionic liquid could demonstrate stable electrochemical properties even beyond 4 V . Nohira et al proposed the physicochemical and electrochemical performance of K[N(SO 2 F) 2 ]–[ N ‐Methyl‐ N ‐propylpyrrolidinium] [N(SO 2 F) 2 ] ionic liquids for KIBs . This study revealed that the ionic conductivity of this electrolyte (4.8 mS cm −1 at 298 K) is higher than sodium‐ and lithium‐based ionic liquids.…”

Section: Different Electrolytesmentioning

confidence: 83%

“…This study revealed that the ionic conductivity of this electrolyte (4.8 mS cm −1 at 298 K) is higher than sodium‐ and lithium‐based ionic liquids. Further, the electrochemical characterizations revealed that the K deposition/dissolution occurs at a more negative voltage as compared to Li and Na metal counterparts, implying that K‐based ionic liquids can provide a higher working potential for KIB applications . Placke et al proposed a dual graphite battery, where the battery was assembled by taking graphite as both the electrodes and a K‐based ionic liquid (PTFSA in Pyr 14 TFSA) as electrolyte .…”

Section: Different Electrolytesmentioning

confidence: 99%

“…Further, the electrochemical characterizations revealed that the K deposition/dissolution occurs at a more negative voltage as compared to Li and Na metal counterparts, implying that K-based ionic liquids can provide a higher working potential for KIB applications. [201] Placke et al proposed a dual graphite battery, where the battery was assembled by taking graphite as both the electrodes and a K-based ionic liquid (PTFSA in Pyr 14 TFSA) as electrolyte. [202] This electrode, electrolyte combination could demonstrate a capacity of over 42 mA h g −1 at 250 mA g −1 with a Coulombic efficiency of >99% and a cycling stability of 95% over 1500 cycles in a voltage window of 3.4-5.0 V versus K/K + .…”

Section: Ionic Electrolytesmentioning

confidence: 99%

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Advancements and Challenges in Potassium Ion Batteries: A Comprehensive Review

Rajagopalan

Tang

et al. 2020

Adv Funct Materials

620

401

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Demand for energy in day to day life is increasing exponentially. However, existing energy storage technologies like lithium ion batteries cannot stand alone to fulfill future needs. In this regard, potassium ion batteries (KIBs) that utilize K ions in their charge storage mechanism have attracted considerable attention due to their unique properties and are therefore established as one of the future battery systems of interest among the scientific community. Nevertheless, the development and identification of appropriate electrode materials is very essential for practical applications. This review features the current development in KIBs electrode and electrolyte materials, the present challenges facing this technology (in the commercial aspect), and future aspects to develop fully functional KIBs. The potassium storage mechanisms, evolution of the KIBs, and the advantages and disadvantages of each category of materials are included. Additionally, various approaches to enhance the electrochemical performances of KIBs are also discussed. This review is not only an amalgamation of different viewpoints in literature, but also contains concise perspectives and strategies. Moreover, the potential emergence of a novel class of K‐based dual ion batteries is also analyzed for the first time.

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Recent Progress in Rechargeable Potassium Batteries

Hwang

Myung

Sun

2018

Adv Funct Materials

550

371

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The topic of sustainable and eco-friendly energy storage technologies is an issue of global significance. To date, this heavy burden is solely addressed by lithium-ion battery technology. However, the ongoing depletion of limited global lithium resources has restricted their future availability for Li-ion battery technology, and hence, a significant price increase is expected. This grim situation is the driving force for the development of the "beyond Li-ion battery" strategy involving alternatives that have several advantages over conventional Li-ion batteries in terms of cost, durability, safety, and sustainability. Potassium, the closest neighboring alkali element after sodium, offers some unique advantages over lithium and sodium as a charge carrier in rechargeable batteries. Potassium intercalation chemistry in potassium-ion batteries (KIBs) is successfully demonstrated to be compatible with Li-ion batteries and sodium-ion batteries. In addition to KIBs, potassium-sulfur and potassium-oxygen batteries have emerged as new energy-storage systems due to their low costs and high specific energy densities. This review covers the key technological developments and scientific challenges for a broad range of rechargeable potassium batteries, while also providing valuable insight into the scientific and practical issues concerning the development of potassium-based rechargeable batteries.in the price of lithium is primarily ascribed to the increased demand for LIB production for use in electric vehicles and energy-storage systems. For this reason, the development of sodium-ion batteries has steadily increased because SIBs and LIBs use a similar intercalation chemistry. One notable feature of an SIB is that the use of graphite, which is common in LIBs, is unfavorable owing to the difficulties associated with the insertion of Na + into the graphite interlayers. Strikingly, K + ions do intercalate into graphene layers; accordingly, graphite is available to be used as a KIB-anode material. One of the merits of a graphite anode is its favorable energy density. It is therefore possible for KIBs to compete commercially with SIBs that use hard carbon as an anode material. However, additional research is required to scale the development of KIBs to that of SIBs, at the very least. To highlight recent KIB progress, several candidate electrode materials, electrolytes, binders, and full cells are described in this review. capacity was reduced (Figure 4c,d). Notably, many voltage plateaus are associated with several phase transitions due to K + / vacancy ordering in the oxide lattice, which progresses via a P3-biphasic-O3-biphasic-X phase by analogy with the O3 phase ( Figure 4e). This phase transition is reversible during discharge to 1.5 V. Density functional theory (DFT) calculations provided

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Physicochemical and Electrochemical Properties of K[N(SO₂F)₂]–[N-Methyl-N-propylpyrrolidinium][N(SO₂F)₂] Ionic Liquids for Potassium-Ion Batteries

Cited by 76 publications

References 63 publications

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

Advancements and Challenges in Potassium Ion Batteries: A Comprehensive Review

Recent Progress in Rechargeable Potassium Batteries

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