Characterization of NaX (X: TFSI, FSI) – PEO based solid polymer electrolytes for sodium batteries

Boschin, Andrea; Johansson, Patrik

doi:10.1016/j.electacta.2015.03.228

Cited by 162 publications

(147 citation statements)

References 51 publications

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“…Thus, we cannot neither exclude nor confirm the participation of PC in the first solvation shell. Between 730 and 765 cm À1 a TFSI anion mode gives rise to a band considered the best probe for studying cation solvation by Raman spectroscopy, with "free" TFSI anions and contact ion-pairs with Li þ located at 742 and 746 cm À1 , respectively [88e90], and similarly the contact ion-pairs with Na þ at 744-745 cm À1 [91]. With decreasing EC:PC concentration in the electrolytes the relative amount of Na þ -TFSI contact ion-pairs increases, as expected, shifting the centre of the envelope to higher wavenumbers ( Fig.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Towards safer sodium-ion batteries via organic solvent/ionic liquid based hybrid electrolytes

Monti

Ponrouch

Palacín

et al. 2016

Journal of Power Sources

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h i g h l i g h t sThe ionic liquid of the hybrid electrolytes improves the general safety. The cation solvation shell is modified with the composition of the electrolyte. The physical properties are relatively unaltered by addition of up to 20% of IL. Half-cells using hard carbon electrodes exhibit good capacities and capacity retentions. a b s t r a c tHybrid electrolytes aimed at application in sodium-ion batteries (SIB) consisting of an organic solvent mixture (EC:PC) and different ionic liquids (ILs); EMImTFSI, BMImTFSI, and Pyr 13 TFSI, and with the NaTFSI salt providing the Na þ charge carriers have here been extensively studied. The physico-chemical and electrochemical characterisation includes ionic conductivity, viscosity, density, cation coordination and solvation, various safety measures, and electrochemical stability window (ESW). Hybrid electrolytes with 10e50% of IL content were found to have ionic conductivities on par with comparable organic solvent based electrolytes, but with highly enhanced safety properties. A systematic Raman spectroscopy study of the cation coordination and solvation before and after electrolyte safety tests by ignition suggest that IL cations and TFSI remain stable when ignited while organic solvents are consumed. Finally, the solid electrolyte interphase (SEI) formed when using hybrid electrolytes has both better mechanical and electrochemical stability than the SEI derived from pure IL based electrolytes. For a half-cell with a hard carbon (HC) electrode and a hybrid electrolyte with a composition of 0.8 m NaTFSI in EC 0.45 :PC 0.45 :-Pyr 13 TFSI 0.10 encouraging results were obtained for IL based electrolytes e ca. 182 mAhg À1 at C/10 over 40 cycles.

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Section: Raman Spectroscopymentioning

confidence: 99%

Towards safer sodium-ion batteries via organic solvent/ionic liquid based hybrid electrolytes

Monti

Ponrouch

Palacín

et al. 2016

Journal of Power Sources

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“…[17] Thea ddition of ionic liquids into the cathode and at the solid-solid interface is hampered by poor wettability of the cathode particles. [22][23][24] Herein, we report application of ap lastic-crystal Na +electrolyte interphase consisting of succinonitrile complexed with as odium salt. 10 À7 Scma tr oom temperature) and the limited electrochemical stability window (below 3.7 Vv s. Na + /Na) of solid polymer electrolyte of polyethylene oxide (PEO) may also hinder its integration into ac athode to minimize the interfacial resistances,e specially for high-voltage solid-state batteries.…”

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A Plastic–Crystal Electrolyte Interphase for All‐Solid‐State Sodium Batteries

et al. 2017

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The development of all-solid-state rechargeable batteries is plagued by a large interfacial resistance between a solid cathode and a solid electrolyte that increases with each charge-discharge cycle. The introduction of a plastic-crystal electrolyte interphase between a solid electrolyte and solid cathode particles reduces the interfacial resistance, increases the cycle life, and allows a high rate performance. Comparison of solid-state sodium cells with 1) solid electrolyte Na Zr (Si PO ) particles versus 2) plastic-crystal electrolyte in the cathode composites shows that the former suffers from a huge irreversible capacity loss on cycling whereas the latter exhibits a dramatically improved electrochemical performance with retention of capacity for over 100 cycles and cycling at 5 C rate. The application of a plastic-crystal electrolyte interphase between a solid electrolyte and a solid cathode may be extended to other all-solid-state battery cells.

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“…Nonetheless, continued interest in such technologies stems from their processing ability and flexibility, higher safety due to the absence of flammable organic solvents and high dimensional stability45678910111213. Despite not being fluid in a wide temperature range, polyethers were first shown to dissolve inorganic salts and conduct resulting ions at room temperature in the 1970s14.…”

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confidence: 99%

Fluorine-free electrolytes for all-solid sodium-ion batteries based on percyano-substituted organic salts

Bitner-Michalska

Nolis

Żukowska

et al. 2017

Sci Rep

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A new family of fluorine-free solid-polymer electrolytes, for use in sodium-ion battery applications, is presented. Three novel sodium salts withdiffuse negative charges: sodium pentacyanopropenide (NaPCPI), sodium 2,3,4,5-tetracyanopirolate (NaTCP) and sodium 2,4,5-tricyanoimidazolate (NaTIM) were designed andtested in a poly(ethylene oxide) (PEO) matrix as polymer electrolytes for anall-solid sodium-ion battery. Due to unique, non-covalent structural configurations of anions, improved ionic conductivities were observed. As an example, “liquid-like” high conductivities (>1 mS cm−1) were obtained above 70 °C for solid-polymer electrolyte with a PEO to NaTCP molar ratio of 16:1. All presented salts showed high thermal stability and suitable windows of electrochemical stability between 3 and 5 V. These new anions open a new class of compounds with non-covalent structure for electrolytes system applications.

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Characterization of NaX (X: TFSI, FSI) – PEO based solid polymer electrolytes for sodium batteries

Cited by 162 publications

References 51 publications

Towards safer sodium-ion batteries via organic solvent/ionic liquid based hybrid electrolytes

Towards safer sodium-ion batteries via organic solvent/ionic liquid based hybrid electrolytes

A Plastic–Crystal Electrolyte Interphase for All‐Solid‐State Sodium Batteries

Fluorine-free electrolytes for all-solid sodium-ion batteries based on percyano-substituted organic salts

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