New polymerized ionic liquid (PIL) gel electrolyte membranes based on tetraalkylammonium cations for lithium ion batteries

Li, Mingtao; Yang, Bolun; Wang, Lu; Zhang, Ying; Zhang, Zhan; Fang, Shaohua; Zhang, Zhengxi

doi:10.1016/j.memsci.2013.07.007

Cited by 76 publications

(52 citation statements)

References 34 publications

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“…140 mAh/g. This behaviour is likely due to the formation of some kind of solid electrolyte interphase (SEI), [25] which exist also in other polymer based electrolytes [34], but could also be due to improved penetration and contact of the IL component [35] enabling the higher and more stable discharge capacities. The higher CE of A 3:1 vs. A 9:1 and B 3:1 vs. B 9:1 arises from lower interfacial resistances as received from impedance characterization (Figure 6) for the PIL el with higher LiTFSI concentration.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

“…As a result, the LIB in hybrid or fully electric vehicles (xEVs) has its own cooling system, keeping it at a safe but slightly elevated operating temperature-often ca. [30][31][32][33][34][35] • C. A drastically alternative approach is to remove the special battery cooling system and merge it with the cooling system of the power electronics, working to cool to ca. 80-100 • C, whereby the overall efficiency of the vehicle can be increased [6].…”

Section: Introductionmentioning

confidence: 99%

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Pyrrolidinium FSI and TFSI-Based Polymerized Ionic Liquids as Electrolytes for High-Temperature Lithium-Ion Batteries

Kerner

Johansson

2018

Batteries

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Promising electrochemical and dynamical properties, as well as high thermal stability, have been the driving forces behind application of ionic liquids (ILs) and polymerized ionic liquids (PILs) as electrolytes for high-temperature lithium-ion batteries (HT-LIBs). Here, several ternary lithium-salt/IL/PIL electrolytes (PIL el ) have been investigated for synergies of having both FSI and TFSI anions present, primarily in terms of physico-chemical properties, for unique application in HT-LIBs operating at 80 • C. All of the electrolytes tested have low T g and are thermally stable ≥100 • C, and with TFSI as the exclusive anion the electrolytes (set A) have higher thermal stabilities ≥125 • C. Ionic conductivities are in the range of 1 mS/cm at 100 • C and slightly higher for set A PIL el , which, however, have lower oxidation stabilities than set B PIL el with both FSI and TFSI anions present: 3.4-3.7 V vs. 4.2 V. The evolution of the interfacial resistance increases for all PIL el during the first 40 h, but are much lower for set B PIL el and generally decrease with increasing Li-salt content. The higher interfacial resistances only influence the cycling performance at high C-rates (1 C), where set B PIL el with high Li-salt content performs better, while the discharge capacities at the 0.1 C rate are comparable. Long-term cycling at 0.5 C, however, shows stable discharge capacities for 100 cycles, with the exception of the set B PIL el with high Li-salt content. Altogether, the presence of both FSI and TFSI anions in the PIL el results in lower ionic conductivities and decreased thermal stabilities, but also higher oxidation stabilities and reduced interfacial resistances and, in total, result in an improved rate capability, but compromised long-term capacity retention. Overall, these electrolytes open for novel designs of HT-LIBs.

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Section: Electrochemical Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pyrrolidinium FSI and TFSI-Based Polymerized Ionic Liquids as Electrolytes for High-Temperature Lithium-Ion Batteries

Kerner

Johansson

2018

Batteries

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“…38 To prepare the PIL(Br)-FG, 2 mmol of PIL(Br) were dissolved in water and added to 20 mL (1.5 mg mL -1 ) of an aqueous GO suspension. 38 To prepare the PIL(Br)-FG, 2 mmol of PIL(Br) were dissolved in water and added to 20 mL (1.5 mg mL -1 ) of an aqueous GO suspension.…”

Section: Synthesis and Preparation Of Polymeric Ionic Liquid-functionmentioning

confidence: 99%

High performance composite polymer electrolytes using polymeric ionic liquid-functionalized graphene molecular brushes

Wang

et al. 2015

J. Mater. Chem. A

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A new structural design and tailored morphology of polymer-functionalized graphene (polymer-FG) is employed to optimize composite polymer electrolytes (CPEs). The ionic transfer conditions including Li salt dissociation, amorphous content and segmental mobility are significantly improved by incorporating polymer-FG, especially that having a polymeric ionic liquid (PIL) and a polymer brush structure [PIL(TFSI)-FGbrush]. Electrical shorts are eliminated due to the presence of the functionalized polymer on reduced graphene oxide (RGO) and a minimal amount of polymer-FG in the PEO/Li + polymer electrolytes (PEs). Polymer-FG with PIL brushes increases significantly the Li ion conductivity of PEO/Li + PE by >2 orders of magnitude and ~20-fold at 30 °C and 60 °C with high Li salt loading (O/Li= 8/1), respectively. Furthermore, significant improvements in mechanical properties are observed where only 0.6 wt% addition of the PIL(TFSI)-FGbrush led to more than 300% increase in the tensile strength of the PEO/Li + at an O/Li ratio of 16/1. Li-ion battery performance was evaluated with the CPE containing 0.6 wt% of PIL(TFSI)-FGbrush, resulting in superior capacity and cycle performance compared to that of the PEO/Li + PE. Thus, we believe by embedding minimal amounts of structurally and morphologically optimized polymer-FG nano-fillers, it can lead to the development of a new class of SPEs with high ionic conductivity for high performance allsolid-state Li-ion batteries.

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“…Currently, there is a growing interest in the design and preparation of polymeric ionic liquids (PILs) as safe electrolytes for the application in electrochemical devices, such as Li and Li-ion battery [1][2][3][4][5][6][7], solar-cells [8,9], fuel cells [10][11][12] and supercapacitors [13,14]. This is mainly motivated by the combination of both the advanced properties of conventional ionic liquids (ILs) and the flexibility and mechanical properties of polymers [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Solid polymer electrolyte comprised of lithium salt/ether functionalized ammonium-based polymeric ionic liquid with bis(fluorosulfonyl)imide

Zhang

Liu

Zheng

et al. 2015

Electrochimica Acta

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New polymerized ionic liquid (PIL) gel electrolyte membranes based on tetraalkylammonium cations for lithium ion batteries

Cited by 76 publications

References 34 publications

Pyrrolidinium FSI and TFSI-Based Polymerized Ionic Liquids as Electrolytes for High-Temperature Lithium-Ion Batteries

Pyrrolidinium FSI and TFSI-Based Polymerized Ionic Liquids as Electrolytes for High-Temperature Lithium-Ion Batteries

High performance composite polymer electrolytes using polymeric ionic liquid-functionalized graphene molecular brushes

Solid polymer electrolyte comprised of lithium salt/ether functionalized ammonium-based polymeric ionic liquid with bis(fluorosulfonyl)imide

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