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Boosting energy-storage capability in carbon-based supercapacitors using low-temperature water-in-salt electrolytes

Journal of Energy Chemistry 2022年第7期31卷 521-530,I0013页

作者： Joao Pedro A.Santos Manuel J.Pinzón érick A.Santos Rafael Vicentini Cesar J.B.Pagan Leonardo M.Da Silva Hudson Zanin Brazilian Renewable Energies Center for Innovation on New EnergiesSchool of Electrical and Computer EngineeringUniversity of CampinasSao Paulo 13083-852Brazil Department of Semiconductors Instruments and PhotonicsSchool of Electrical and Computer EngineeringUniversity of CampinasSao Paulo 13083-852Brazil Laboratory of Fundamental and Applied Electrochemistry Department of ChemistryFederal University of Jequitinhonha e Mucuri’s ValleyMinas Gerais 39100-000Brazil

Supercapacitors(SCs) are high-power energy storage devices with ultra-fast charge/discharge *** using concentrated aqueous-based electrolytes can work at low temperatures due to their intrinsic properties, such as higher freezing point depression(FPD) and robustness. Besides the traditional organic-and aqueous-based(salt-in-water) electrolytes used in SCs, water-in-salt(WISE) sodium perchlorate electrolytes offer high FPD, non-flammability, and low-toxicity conditions, allowing the fabrication of safer, environmentally friendly, and more robust devices. For the first time, this work reports a comprehensive study regarding WISE system’s charge-storage capabilities and physicochemical properties under low-temperature conditions(T < 0 ℃) using mesoporous carbon-based electrodes. The effect of temperature reduction on the electrolyte viscosity and electrical properties was investigated using different techniques and the in-situ(or operando) Raman spectroscopy under dynamic polarization *** cell voltage, equivalent series resistance, and specific capacitance were investigated as a function of the temperature. The cell voltage(U) increased ~ 50%, while the specific capacitance decreased ~20%when the temperature was reduced from 25 ℃ to -10 ℃. As a result, the maximum specific energy(E = CU^(2)/2) increased ~ 100%. Therefore, low-temperature WISEs are promising candidates to improve the energy-storage characteristics in SCs.

关键词： Carbon supercapacitors water-in-salt electrolytes Low-temperature charge-storage Specific energy improvement at low temperatures

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Free-Standing α-MoO_(3)/Ti_(3)C_(2) MXene Hybrid Electrode in water-in-salt electrolytes

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Energy & Environmental Materials 2023年第4期6卷 6-14页

作者： Mohit Saraf Christopher E.Shuck Nazgol Norouzi Kyle Matthews Alex Inman Teng Zhang Ekaterina Pomerantseva Yury Gogotsi A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphia PA 19104USA

While transition-metal oxides such as α-MoO_(3)provide high capacity,their use is limited by modest electronic conductivity and electrochemical instability in aqueous ***-dimensional(2D)MXenes,offer metallic conductivity,but their capacitance is limited in aqueous *** of partially solvated cations into Ti_(3)C_(2)MXene from lithium-based water-in-salt(WIS)electrolytes enables charge storage at positive potentials,allowing a wider potential window and higher ***,we demonstrate that α-MoO_(3)/Ti_(3)C_(2)hybrids combine the high capacity of α-MoO_(3)and conductivity of Ti_(3)C_(2)in WIS(19.8 m LiCI)electrolyte in a wide1.8 V voltage *** voltammograms reveal multiple redox peaks from α-MoO_(3)in addition to the well-separated peaks of Ti_(3)C_(2)in the hybrid *** leads to a higher specific charge and a higher rate capability compared to a carbon and binder containing α-MoO_(3)*** results demonstrate that the addition of MXene to less conductive oxides eliminates the need for conductive carbon additives and binders,leads to a larger amount of charge stored,and increases redox capacity at higher *** addition,MXene encapsulated α-MoO_(3)showed improved electrochemical stability,which was attributed to the suppressed dissolution of α-MoO_(3).The work suggests that oxide/MXene hybrids are promising for energy storage.

关键词： free-standing electrode Ti_(3)C_(2)MXene water-in-salt electrolytes α-MoO_(3)nanobelts

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Solid electrolyte interphase in water-in-salt electrolytes

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Science China Materials 2021年第7期64卷 1571-1579页

作者： Dezhong Liu Lixia Yuan Yunhui Huang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The water-in-salt strategy successfully expands the electrochemical window of the aqueous electrolyte from1.23 to~3.0 V,which can lead to a breakthrough in the energy output of the aqueous battery system while maintaining the advantage of high *** expanded electrochemical window of the water-in-salt electrolytes can be ascribed to the decreased water activity and the solid electrolyte interphase formed on the *** solid electrolyte interphase in the aqueous system is not fully understood,and the basic composition,the structure,and the formation mechanism are still cloaked in *** perspective summarizes the published research with emphasis on the most possible formation mechanism and composition of the interphase layer in the aqueous *** understanding of the interphase as well as rounded assessment of the water-in-salt electrolyte in practical operating conditions is *** full understanding of the interface will guide the design of aqueous electrolytes and help to build novel aqueous batteries with high safety and high energy density.

关键词： solid electrolyte interphase water-in-salt electrolytes aqueous rechargeable Li-ion batteries

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Fabrication of high Li:water molar ratio electrolytes for lithium-ion batteries

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Chinese Chemical Letters 2021年第2期32卷 834-837页

作者： Miaofeng Huang Jiajie Yang Siron Zhen Chubin Wan Xiaoping Jiang Xin Ju University of Science and Technology Beijing Beijing 100083China Qilu University of Technology Shandong Academy of SciencesJi'nan 250014China

Hydrous electrolytes with high electrochemical potentials were obtained by hydrating water molecules into solutes to form high Li:water molar ratio electrolytes(HMRE).Solid polyethylene glycol(PEG) were e mployed to enha nce the molar ratio of Li^(+) to water in the electrolytes while reducing the consumption of *** obtained mole ratio of Li^(+) to wa ter molecules in the hydrous electrolytes was greater than 1:1;however,the mass fraction of Li-salt was reduced to 61%(approximately 5.5 mol/kg,based on water and PEG).Compared with that of water-in-salt electrolytes,the mass fraction of Li-salt could be remarkably reduced by adding solid *** electrochemical stability of the electrolytes improved considerably because of the strong hydration of Li^(+) by the water molecules.A beneficial passivation effect,arising from the decomposition of the electrolyte,at a wide potential window was observed.

关键词： Aqueous electrolyte Wide potential window Aqueous Li-ion battery Solid electrolyte interface water-in-salt electrolytes

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