Effect of titanium dioxide （TiO2） and carbon additives in the respective positive and negative material properties and the influence on the performance of the battery were investigated. The electrode samples were ch...Effect of titanium dioxide （TiO2） and carbon additives in the respective positive and negative material properties and the influence on the performance of the battery were investigated. The electrode samples were characterized by BET （Brunauer Emmett Teller）, XRD （X-ray diffractometer）, SEM （scanning electron microscopy） and EIS （electrochemical impedance spectroscopy） to understand the surface area, phase, structure, morphology and electrical conductivity of the respective electrode material. The surface area was obtained as 2.312 m2＂g＂l and 0.892 m2＂g＂1, respectively for 12% of activated carbon in the expander of negative and 0.70% of TiO2 （Titanium dioxide） in the PAM （positive active material）. The structural analysis reveals an increase in the tetrabasic lead sulfate and also evidenced by well grown crystals in the PAM with the TiO2, respectively obtained by XRD and SEM techniques. The impedance spectra analysis shows an increase of electrical conductivity of negative active mass with temperature. The battery results showing two fold enhancements in the charge acceptance were attributed to the high surface area activated carbon in the NAM （negative active material）. The materials properties of electrodes and their influence on the battery performance were discussed.展开更多
Aqueous Na-ion batteries have been extensively studied for large-scale energy storage systems. However,their wide application is still limited by their inferior cycle stability(<3000 cycles) and poor temperature to...Aqueous Na-ion batteries have been extensively studied for large-scale energy storage systems. However,their wide application is still limited by their inferior cycle stability(<3000 cycles) and poor temperature tolerance. Furthermore, many of the reported high rate behaviors are achieved at a low mass loading(<3 mg cm^(-2)) of the electrodes. Herein, we propose an aqueous Na-ion battery which includes a Ni-based Prussian blue(NiHCF) cathode, a carbonyl-based organic compound, 5,7,12,14-pentacenetetrone(PT)anode and a “water-in-salt” electrolyte(17 mol kg^(-1)NaClO_(4)in water). Its operation involves the reversible coordination reaction of the PT anode and the extraction/insertion of Na;in the NiHCF cathode. It is demonstrated that the wide internal spaces of the PT anode and NiHCF cathode can not only buffer the volumetric change induced by Na;storage, but also enable fast kinetics. The full cell exhibits a supercapacitor-like rate performance of 50 A g^(-1)(corresponding to a discharge or charge within 6.3 s)and a super-long lifespan of 15,000 cycles. Moreover, the excellent rate performance can still be preserved even with a high mass loading of the electrodes(15 mgNiHCFcm^(-2)and 8 mgPTcm^(-2)).Especially, the cell can work well in a wide temperature range, from-40 to 100 °C, showing a typical all-climate operation.展开更多
Iron difluoride(FeF_(2))is considered a highcapacity cathode material for lithium-ion batteries.However,its specific capacity and stability are limited by the poor electrochemical kinetics of conversion reactions.Here...Iron difluoride(FeF_(2))is considered a highcapacity cathode material for lithium-ion batteries.However,its specific capacity and stability are limited by the poor electrochemical kinetics of conversion reactions.Herein,the conversion reaction is confined in a localized nanosized space by encapsulating FeF_(2) nanoparticles in polymer gelatin.The FeF_(2) nanocrystal-coated polyvinylidene fluoride-based layer(defined as Fe F_(2) @100%G-40%P)was synthesized by glucoseassisted in-situ gelatinization to construct an artificial cathode solid electrolyte interphase via a solvothermal process.Thanks to the improved kinetics of the localized conversion reaction,the obtained FeF_(2) @100%G-40%P electrodes show good cyclic stability(313mAhg^(-1) after 150 cycles at 100 mAg^(-1) ,corresponding to a retention of 80%)and a high rate performance(186.6 mAhg^(-1) at 500 mAg^(-1)).展开更多
文摘Effect of titanium dioxide （TiO2） and carbon additives in the respective positive and negative material properties and the influence on the performance of the battery were investigated. The electrode samples were characterized by BET （Brunauer Emmett Teller）, XRD （X-ray diffractometer）, SEM （scanning electron microscopy） and EIS （electrochemical impedance spectroscopy） to understand the surface area, phase, structure, morphology and electrical conductivity of the respective electrode material. The surface area was obtained as 2.312 m2＂g＂l and 0.892 m2＂g＂1, respectively for 12% of activated carbon in the expander of negative and 0.70% of TiO2 （Titanium dioxide） in the PAM （positive active material）. The structural analysis reveals an increase in the tetrabasic lead sulfate and also evidenced by well grown crystals in the PAM with the TiO2, respectively obtained by XRD and SEM techniques. The impedance spectra analysis shows an increase of electrical conductivity of negative active mass with temperature. The battery results showing two fold enhancements in the charge acceptance were attributed to the high surface area activated carbon in the NAM （negative active material）. The materials properties of electrodes and their influence on the battery performance were discussed.
基金funding support from the National Key Research and Development Plan(2016YFA0203302 2018YFE0201702 and 2016YFB0901500)the National Natural Science Foundation of China(21975052 21935003 and 21875045)Chenguang Program supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(19CG01)。
文摘Aqueous Na-ion batteries have been extensively studied for large-scale energy storage systems. However,their wide application is still limited by their inferior cycle stability(<3000 cycles) and poor temperature tolerance. Furthermore, many of the reported high rate behaviors are achieved at a low mass loading(<3 mg cm^(-2)) of the electrodes. Herein, we propose an aqueous Na-ion battery which includes a Ni-based Prussian blue(NiHCF) cathode, a carbonyl-based organic compound, 5,7,12,14-pentacenetetrone(PT)anode and a “water-in-salt” electrolyte(17 mol kg^(-1)NaClO_(4)in water). Its operation involves the reversible coordination reaction of the PT anode and the extraction/insertion of Na;in the NiHCF cathode. It is demonstrated that the wide internal spaces of the PT anode and NiHCF cathode can not only buffer the volumetric change induced by Na;storage, but also enable fast kinetics. The full cell exhibits a supercapacitor-like rate performance of 50 A g^(-1)(corresponding to a discharge or charge within 6.3 s)and a super-long lifespan of 15,000 cycles. Moreover, the excellent rate performance can still be preserved even with a high mass loading of the electrodes(15 mgNiHCFcm^(-2)and 8 mgPTcm^(-2)).Especially, the cell can work well in a wide temperature range, from-40 to 100 °C, showing a typical all-climate operation.
基金supported by the Science and Technology Commission of Shanghai Municipality(20520710400,19JC1412600 and 18230743400)the National Natural Science Foundation of China(21771124 and 21901156)+1 种基金the Oceanic Interdisciplinary Program(SL2020MS020)the SJTU-Warwick Joint Seed Fund(2019/20)of Shanghai Jiao Tong University。
文摘Iron difluoride(FeF_(2))is considered a highcapacity cathode material for lithium-ion batteries.However,its specific capacity and stability are limited by the poor electrochemical kinetics of conversion reactions.Herein,the conversion reaction is confined in a localized nanosized space by encapsulating FeF_(2) nanoparticles in polymer gelatin.The FeF_(2) nanocrystal-coated polyvinylidene fluoride-based layer(defined as Fe F_(2) @100%G-40%P)was synthesized by glucoseassisted in-situ gelatinization to construct an artificial cathode solid electrolyte interphase via a solvothermal process.Thanks to the improved kinetics of the localized conversion reaction,the obtained FeF_(2) @100%G-40%P electrodes show good cyclic stability(313mAhg^(-1) after 150 cycles at 100 mAg^(-1) ,corresponding to a retention of 80%)and a high rate performance(186.6 mAhg^(-1) at 500 mAg^(-1)).
