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Building ultra-stable K–Te battery by molecular regulation

Journal of Energy Chemistry 2022年第6期31卷 100-107,I0004页

作者： Jiawan Zhou Dongyang Shen Xinzhi Yu Bingan Lu School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina College of Science Hunan University of Technology and BusinessChangsha 410205HunanChina

Tellurium (Te) is an ideal electrode for potassium ion batteries (PIBs) owing to its excellent electronic conductivity and high volumetric ***,the Te electrode is prone to capacity fading as the shuttle *** address this challenge,we propose molecular regulated Se–Te solid solutions on N-doped porous carbon as the PIBs *** optimizing the Se content in Se–Te solid solutions,the resultant SeTe_(6.8) on N-doped porous carbon (SeTe_(6.8)@C) delivered a capacity of over 400 mAh g^(-1) with a flat plateau of 1.0 V at 500 m A g^(-1).It also achieved a superiorly long cycle life,running for more than 1600 cycles (over 7 months with 0.015%degeneration per cycle) at 100 mA g^(-1) and excellent rate performance (179.9 mAh g^(-1) at 10000 mA g^(-1)).This remarkable electrochemical energy storage of the Te electorde likely arises from suppression of the shuttle effect after doping the Te with strongly electronegative Se atoms (forming K_(s)Te_(3) which is not easily soluble in electrolyte).This study presents a fresh approach for designing and developing ultra-stable Te-based electrodes for PIBs and beyond.

关键词： Se–Te solid solutions ultra-long cycle life Potassium tellurium battery Molecular regulation

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Promoting operating voltage to 2.3 V by a superconcentrated aqueous electrolyte in carbon-based supercapacitor

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Chinese Chemical Letters 2021年第7期32卷 2217-2221页

作者： Man Zhang Weijian Wang Xianhui Liang Chang Li Wenjun Deng Haibiao Chen Rui Li School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China

Aqueous supercapacitors(SCs)have attracted more and more attention for their safety,fast charge/discharge capability and ultra-long ***,the application of aqueous SCs is limited by the low working voltage due to the narrow electrochemical stability window(ESW)of wate ***,we report a new"water in salt"(WIS)electrolyte by dissolving potassium bis(fluorosulfonyl)amide(KFSI)in water with an ultra-high mass molar concentration of 37 mol/*** highly concentrated electrolyte can achieve a wide ESW of 2.8 *** WIS electrolyte enables a safe carbon-based symmetrical supercapacitor to operate stably at 2.3 V with an ultra-long cycle life and excellent rate *** energy density reaches 20.5 Wh/kg at 2300 W/kg,and the capacity retention is 83.5%after 50,000 cycles at a current density of 5 A/*** new electrolyte will be a promising candidate for future high-voltage aqueous supercapacitors.

关键词： Aqueous supercapacitors Potassium bis(fluorosulfonyl)amide Operation voltage Water in salt ultra-long cycle life

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Enabling Extraordinary Rate Performance for Poorly Conductive Oxide Pseudocapacitors

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Energy & Environmental Materials 2020年第3期3卷 405-413页

作者： Mozaffar Abdollahifar Hao-Wen Liu Chia-Hsin Lin Yu-Ting Weng Hwo-Shuenn Sheu Jyh-Fu Lee Meng-Lin Lu Yen-Fa Liao Nae-Lih Wu Department of Chemical Engineering National Taiwan UniversityTaipei 106Taiwan National Synchrotron Radiation Research Center Hsinchu 30076Taiwan Taiwan Beamline Office at SPring-8 1-1-1 KoutoMikazukiSayoHyogo 679-5198Japan Advanced Research Center for Green Materials Science and Technology National Taiwan UniversityTaipei 10617Taiwan

Pseudocapacitive transition metal oxides(PTMOs)have the advantages of high areal capacitance and material density suitable for high-energy supercapacitor devices,but they are typically marred by insufficient rate performance,which in turn deteriorates cyclic stability at high current *** the example of spinel manganese oxide,herein we demonstrate that a pseudocapacitive oxide electrode of remarkable rate performance and cyclic stability may be realized by adopting oxide nanocrystallites,which are derived based on a novel solution chemistry,and carbon additive(CA)nanoparticles with highly uniform of size *** controlling the particle morphology and size distribution of the active material and conductive additive(CA)in the nanometer range can maximize the density of active material-CA-electrolyte three-phase contact points,thus facilitating synchronized electron and cation flow for the completion of surface faradaic *** resultant Mn3O4 pseudocapacitive electrode exhibits rate capability and cycle stability,including 60%capacity retention at 60 A g-1 and no capacity fade over 100000 cycles under dynamic current densities,far superior to the state-of-the-art PTMO *** electrode design strategy is in general applicable to pseudocapacitors containing poorly conductive active materials.

关键词： high-rate performance pseudocapacitor electrodes single nanoparticles three-phase contact point ultra-long cycle life

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