Solid polymer electrolytes with sulfur based ionic liquid for lithium batteries

Fisher, Aaron S.; Khalid, Mian; Widstrom, Matthew; Kofinas, Peter

doi:10.1016/j.jpowsour.2011.07.081

Cited by 51 publications

(35 citation statements)

References 26 publications

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“…The increased interest in polymerized ionic liquids (PILs) is due to their comparatively high ionic conductivity and good mechanical strength [21,22]. Various polymers such as PEO [23][24][25][26][27][28][29][30][31], homo-and co-polymers of poly(vinylidene fluoride) (PVdF) [32][33][34][35][36][37] and poly(ethylene glycol) dimethyl ether [38] have been used to prepare polymer electrolytes with ionic liquids and have been studied over the last few years. Among them PVdF and its copolimers are important due to their high strength and good stability [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Application of quaternary polymer electrolyte based on ionic liquid in LiFePO4/Li, Li4Ti5O12/Li and LiFePO4/Li4Ti5O12 batteries

Swiderska‐Mocek

2014

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Application of quaternary polymer electrolyte based on ionic liquid in LiFePO4/Li, Li4Ti5O12/Li and LiFePO4/Li4Ti5O12 batteries

Swiderska‐Mocek

2014

Electrochimica Acta

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“…The maximum conductivity values at each temperature for the optimal ratio is as follows 25 Given that all electrolytes exhibited similar transition temperatures in DSC, only a small variation in conductivity values was expected. 12 This trend was not observed, instead wide variability in the conductivity values was observed. The electrolytes can visually be grouped into two groups: one of elevated conductivity and one of lower conductivity.…”

Section: Resultsmentioning

confidence: 92%

Block Copolymer Electrolyte with Sulfur Based Ionic Liquid for Lithium Batteries

Fisher

Khalid

2012

J. Electrochem. Soc.

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There is strong motivation to find suitable alternatives to combustible organic carbonate based electrolytes for lithium batteries. We report on our current work toward the goal of a safer material with the development of a solid polymer electrolyte system. Using triethylsulfonium bisoxalato borate ionic liquid (IL) in poly ethylene oxide (PEO) blocked with fully lithiated poly(methacrylic acid) we synthesized a transparent and pliable solid polymer electrolyte material. The conductivity of this system increased by an order of magnitude over the system without IL such that ionic conductivity at 40 • C was 0.59 mS cm −1 and at 65 • C was 2.06 mS cm −1 . This conductivity increase was accompanied by a greater fraction of current being due to lithium, with a lithium transference (T Li+ ) value of 0.40 at 40 • C. The BCP electrolyte showed an increase in T Li+ relative to the PEO-based homopolymer electrolyte. Electrolyte breakdown was observed at 4.44 V vs. Li/Li + . The electrolyte demonstrated an ability to reversibly strip and plate lithium showing an increase 4.4 mV over 100 cycles.Electrolytes in lithium batteries have become a topic of great interest as scientists and engineers recognize that the electrolyte in lithium batteries limits many of the measured figures of merit in a battery. 1-3 Electrolytes impact performance largely through the stability window, which limits cathode choice and the necessity of solidelectrolyte interphase (SEI) formation that affects the lifetime of a cell. Additionally, the safety issues of the battery are largely a result of the combustible nature of the liquid carbonates. To overcome the safety problems of electrolytes consisting of small volatile organic molecules, there has been much interest in solid polymer electrolytes (SPE). The limiting factor to SPE has been conductivity; many proposed solutions have merely resorted to combining the polymer with the traditional liquid carbonates.Ionic liquids (ILs) have been used successfully to overcome the limited conductivity of polymer matrices because they possess ideal electrochemical properties namely high conductivity, electrochemical stability, and no volatility. When incorporated into poly(ethylene oxide) (PEO) based polymer matrices they have been shown to elevate the ionic conductivity of the electrolyte several orders of magnitude. [4][5][6] have shown that adding 1-butyl-1-methyl pyrrolidinium bis(trifluoromethane sulfonyl) imide (TFSI) to PEO leads to a marked increase in ionic conductivity of 2 orders of magnitude for the highest tested concentrations (molar ratio of 20 PEO: 1 LiTFSI: 3.24 IL). This conductivity increase though is accompanied by a decrease in the lithium transference number (T Li+ , the fraction of total current observed due to movement of lithium ions). A low T Li+ inherently limits the capacity that can be delivered by lithium within each cycle. 7,8 The success of IL additives spurred interest in novel sulfur based IL scaffolds that would overcome observed limitations while mimicking the preferred meth...

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“…B. ZrO 2 ) im Polymerelektrolyten dispergiert, [115] oder es wurden RTILs als Verflüssiger eingesetzt. [119,120] Zum Beispiel zeigt ein Hybridmaterial aus der IL N-Methyl-(n-alkyl)pyrrolidiniumbis(trifluormethansulfonyl)imid und konventionellem PEOPolymer eine deutlich erhçhte Leitfähigkeit. [120] Eine Zelle mit dem Hybridelektrolyten leistet ungefähr 1000 mA h g À1 bei 0.2 C im ersten Zyklus und hält nach 50 Zyklen eine Kapazität von 90 % aufrecht.…”

Section: Ionische Flüssigkeitenunclassified

Lithium‐Schwefel‐Batterien: Elektrochemie, Materialien und Perspektiven

et al. 2013

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Li‐S‐Batterien gelten aufgrund ihrer hohen theoretischen Energiedichte bei guter Kosteneffizienz als attraktive Kandidaten für die nächste Generation von wiederaufladbaren Lithiumbatterien. Dieser Aufsatz gibt einen Überblick über die noch junge Geschichte dieses Batterietyps. Wir diskutieren zentrale elektrochemische Eigenschaften wie die elektrochemische Aktivität und die Bildung und Auflösung von Polysulfiden. Aktuelle Forschungen betreffen die Schwefel‐ Kathode, die Li‐Anode, den Elektrolyten sowie neue Bautypen wie Li‐S‐Batterien mit Li‐freier metallischer Anode. Die Konstruktion von leitfähigen mikroporösen Kohlenstoffmaterialien mit eingeschlossenen S‐Molekülen bietet eine vielversprechende Strategie für zukünftige Batterien mit verbesserter Zyklenstabilität.

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Solid polymer electrolytes with sulfur based ionic liquid for lithium batteries

Cited by 51 publications

References 26 publications

Application of quaternary polymer electrolyte based on ionic liquid in LiFePO4/Li, Li4Ti5O12/Li and LiFePO4/Li4Ti5O12 batteries

Application of quaternary polymer electrolyte based on ionic liquid in LiFePO4/Li, Li4Ti5O12/Li and LiFePO4/Li4Ti5O12 batteries

Block Copolymer Electrolyte with Sulfur Based Ionic Liquid for Lithium Batteries

Lithium‐Schwefel‐Batterien: Elektrochemie, Materialien und Perspektiven

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