2020
DOI: 10.1007/s40820-020-00508-z
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Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

Abstract: HIGHLIGHTS • A green water-in-salt electrolyte was developed using lithium acetate as solute with a wide electrochemical stability window of 2.8 V. • Molecular dynamics simulation confirmed the nature of water-in-salt electrolyte, where hydrogen bonds of water-water were disrupted and ionic interactions became stronger than dilute solution. • Nb 18 W 16 O 93-based lithium-ion capacitors delivered unexceptionable stability over 50,000 cycles.

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Cited by 50 publications
(47 citation statements)
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“…For example, ionic liquids are regarded as a promising alternative to the organic electrolyte owing to their large working voltage, high conductivity and excellent thermal stability without risk of catching fire [ 134 , 138 ]. Recently, “Water-in-Salt” electrolytes have drawn tremendous interest as they inherit the safety advantage of aqueous electrolytes while keeping the high working voltage of organic electrolytes [ 139 , 140 , 141 , 142 ]. The decomposition of electrolytes should not be ignored.…”
Section: Discussionmentioning
confidence: 99%
“…For example, ionic liquids are regarded as a promising alternative to the organic electrolyte owing to their large working voltage, high conductivity and excellent thermal stability without risk of catching fire [ 134 , 138 ]. Recently, “Water-in-Salt” electrolytes have drawn tremendous interest as they inherit the safety advantage of aqueous electrolytes while keeping the high working voltage of organic electrolytes [ 139 , 140 , 141 , 142 ]. The decomposition of electrolytes should not be ignored.…”
Section: Discussionmentioning
confidence: 99%
“…As already mentioned above, the electrochemical investigations on TTB-type NbW oxides gained momentum after the study on Nb18W16O93 had been published by Griffith et al in 2018 [1]. Several follow-up investigations confirmed the outstanding electrochemical performance of samples with this composition [8][9][10][11][12][13]. An orthorhombic structure Nb18W16O93 was proposed by Stephenson in 1968 to explain split reflections observed in higher order Laue zones of a twinned crystal with the composition Nb12W11O63 (6Nb2O5:11WO3) [14].…”
Section: Introductionmentioning
confidence: 94%
“…The sample with composition Nb18W16O93 was prepared by the solid state reaction of Nb2O5 and WO3 powers (molar ratio Nb2O5:WO3 = 9:16). After grinding the powders in an agate mortar, the resulting mixture was pressed into pellets and then annealed in a Pt crucible covered with a Pt lid at 700 °C for 12 h followed by 1200 °C for 12 h. For details, see [12].…”
Section: Synthesismentioning
confidence: 99%
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“…WIS electrolyte also has applications in hybrid capacitors [45b,46–47] . Due to the high solubility and low cost, lithium acetate (LiAc) was used as electrolyte salt to make up 13 m LiAc WIS electrolytes [47b] . The high concentration of salt expanded the electrochemical window to 2.8 V. Oxygen‐enriched crumpled graphene was selected as the capacitive electrode and Nb 18 W 16 O 93 as the battery‐type electrode, 2.0 V aqueous hybrid capacitor was assembled.…”
Section: Regulation Strategies For Aqueous Electrolytesmentioning
confidence: 99%