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您的检索式：作者名="Sujong Chae"
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| 1 | Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries显示文摘The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance decay.Herein,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated coprecipitation.Pelletization-assisted mechanical densification(PAMD)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline particle.Furthermore,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary particle.As a result,single-crystalline Ni-rich cathode with PAMD process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage cycling.This work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs). | Gwonsik Nam Jaeseong Hwang Donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong Ko | 2023 | Journal of Energy Chemistry2023，，4： | 0 |
| 2 | Crosslinked Polyethyleneimine Gel Polymer Interface to Improve Cycling Stability of RFBs显示文摘Redox flow batteries are considered a promising technology for grid energy storage.However,capacity decay caused by crossover of active materials is a universal challenge for many flow battery systems,which are based on various chemistries.In this paper,using the vanadium redox flow battery as an example,we demonstrate a new gel polymer interface(GPI)consisting of crosslinked polyethyleneimine with a large amount of amino and carboxylic acid groups introduced between the positive electrode and the membrane.The GPI functions as a key component to prevent vanadium ions from crossing the membrane,thus supporting stable long-term cycling.Cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)measurements were conducted to investigate the effect of GPI on the electrochemical properties of graphitic carbon electrodes(GCFs)and redox reaction of catholyte.X-ray photoelectron spectroscopy(XPS)and ^(1)H nuclear magnetic resonance(NMR)spectra demonstrated that the crosslinked GPI is chemically stable for 100 cycles without dissolution of polymers and swelling in the strong acidic electrolytes.Results from inductively coupled plasma mass spectrometry(ICP-MS),Fourier-transform infrared(FTIR)spectroscopy,and energy-dispersive X-ray(EDX)spectroscopy proved that the GPI is effective in maintaining the concentration of vanadium species in their respective half-cells,resulting in improved cycling stability because of it prevents active species from crossing the membrane and stabilizes the oxidation states of active species. | Hyung-Seok Lim Sujong Chae Litao Yan Guosheng Li Ruozhu Feng Yongsoon Shin Zimin Nie Bhuvaneswari Modachur Sivakumar Xin Zhang Yangang Liang David Jonathan Bazak Vaithiyalingam Shutthanandan Vijayakumar Murugesan Soowhan Kim Wei Wang | 2022 | Energy Material Advances2022，，1： | 0 |
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