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Nano-Micro Letters 2024年第5期16卷 56-70页

作者： An‑Giang Nguyen Min‑Ho Lee jaekook kim Chan‑Jin Park Department of Materials Science and Engineering Chonnam National University77 Yongbong‑roBuk‑guGwangju 61186South Korea

Composite solid electrolytes(CSEs)have emerged as promising candidates for safe and high-energy–density solid-state lithium metal batteries(SSLMBs).However,concurrently achieving exceptional ionic conductivity and interface compatibility between the electrolyte and electrode presents a significant challenge in the development of high-performance CSEs for *** overcome these challenges,we present a method involving the in-situ polymerization of a monomer within a self-supported porous Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZT)to produce the *** synergy of the continuous conductive LLZT network,well-organized polymer,and their interface can enhance the ionic conductivity of the CSE at room ***,the in-situ polymerization process can also con-struct the integration and compatibility of the solid electrolyte–solid electrode *** synthesized CSE exhibited a high ionic conductivity of 1.117 mS cm^(-1),a significant lithium transference number of 0.627,and exhibited electrochemical stability up to 5.06 V ***/Li+at 30℃.Moreover,the Li|CSE|LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cell delivered a discharge capacity of 105.1 mAh g^(-1) after 400 cycles at 0.5 C and 30℃,corresponding to a capacity retention of 61%.This methodology could be extended to a variety of ceramic,polymer electrolytes,or battery systems,thereby offering a viable strategy to improve the electrochemical properties of CSEs for high-energy–density SSLMBs.

关键词： Scalable tape-casting method Self-supported porous Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12) Composite solid electrolyte LiF-and B-rich interphase layers

In-situ electrochemical functionalization of carbon materials for high-performance Li–O2 batteries

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Journal of Energy Chemistry 2020年第9期29卷 7-13,I0001页

作者： Jungwon Kang Jin Min kim Do Youb kim Jungdon Suk jaekook kim Dong Wook kim Yongku Kang Department of Advanced Materials Science and Engineering Mokpo National University61 dorim-ri1666 Yeongsan-roCheonggye-myeonMuan-gunJeonnamSouth Korea Center for Advanced Battery Materials Advanced Materials DivisionKorea Research Institute of Chemical Technology(KRICT)141 Gajeong-RoYuseong-GuDaejeon 305-600South Korea Department of Materials Science and Engineering Chonnam National University300 Yongbong-dongBukguGwangju 500-757South Korea

The development of effective synthetic routes is important to manifest proper nature of specific ***-situ electrochemical functionalization possesses great advantages over conventional routes,especially facile way and leading to reaching elaborate sites of functional ***,we demonstrate the preparation of functionalized carbons by in-situ electrochemical reduction in an argon atmosphere for application in low-cost,environmentally benign,and high-performance oxygen-electrodes for non-aqueous Li-O2 batteries.A Li-O2 battery with functionalized carbon shows a high discharge capacity(100 times that of pristine carbon),high power and cycling *** outstanding performance is attributed to the high O2 affinity of the functionalized carbon surface that facilitates the formation of soluble and diffusible superoxide intermediates by the reduction of the remaining O2 competing with surface growth for Li2O2 formation.

关键词： Lithium-oxygen battery High areal capacity Functionalization of carbon Electrochemistry

Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries

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Nano Research 2019年第4期12卷 911-917页

作者： Sohyun Park Jinju Song Seyeon kim Balaji Sambandam Vinod Mathew Sungjin kim Jeonggeun Jo Seokhun kim jaekook kim Department of Materials Science and Engineering Chonnam National University 300 Ybngbong-dong Buk-gu Gwangju 500-757 Republic of Korea Gwangju Bio/Energy R&D Center Korea Institute of Energy Research (KIER) 270-25 Samso-ro Buk-gu Gwangju 61003 Republic of Korea

In this study,a pseudo-layered Na super-ionic conductor of Na3V2(PO4)2F3 (NVPF)/C cathode for sodium-ion batteries is prepared successfully using a facile polyol refluxing process without any impurity *** X-ray diffraction and Rietveld refinement results confirm that NVPF possesses tetragonal NASICON-type lattice with a space group of P42/*** this preparative method,polyol is utilized as a solvent as well as a carbon *** presence of nanosized NVPF particles in the carbon network is confirmed by field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM).The existence of carbon is analyzed by Raman scattering and elemental *** applied as a Na-storage material in a potential window of 2.0-4.3 V,the electrode exhibits two flat voltage plateaus at 3.7 and 4.2 V with an electrochemically active V^3+/V^4+ redox *** addition,Na3V2(PO4)2F3/C composite achieved a retention capacity of ~ 88% even after 1,500 cycles at 15 ***,at high current densities of 30 and 50 C,Na3V2(PO4)2F3/C cathode retains the specific discharge capacities of 108.4 and 105.9 mAh·g-1,respectively,revealing the structural stability of the material prepared through a facile polyol refluxing method.

关键词： fluorophosphate Na3V2(PO4)2F3 polyol process sodium ion batteries long life stability

Metal organic framework-combustion: A one-pot strategy to NiO nanoparticles with excellent anode properties for lithium ion batteries

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Journal of Energy Chemistry 2018年第1期27卷 300-305页

作者： Vaiyapuri Soundharrajan Balaji Sambandam Jinju Song Sungjin kim Jeonggeun Jo Pham Tung Duong Seokhun kim Vinod Mathew jaekook kim Department of Materials Science and Engineering Chonnam National University

NiO nanoparticles with average particles size of 30 nm are synthesized using a one-pot metal–organic framework-combustion（MOF-C） technique, for use as an anode material in rechargeable lithium ion batteries（LIBs）. The structural and electronic properties of these nanoparticles are studied using various techniques, including powder X-ray diffraction（PXRD）, transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, and N_2 adsorption/desorption studies. The as-synthesized NiO nanoparticles sustained reversible stable capacities of 748 and 410 mAh/g at applied current densities of 500 and 1000 m A/g, respectively, after 100 cycles. Furthermore, the anode displays a notable rate capability, achieving a stable capacity of ~200 mAh/g at a high current density of10 A/g. These results indicate that the size of the NiO nanoparticles and their high surface area influence their electrochemical properties. Specifically, this combustion strategy is clearly favorable for improving the cyclability and rate capability of various metal oxides in rechargeable battery electrodes.

关键词： Metal-organic frameworks Combustion NiO nanoparticles Lithium ion batteries High rate capability

Cathode nanoarchitectonics with Na_(3)VFe_(0.5)Ti_(0.5)(PO_(4))_(3): Overcoming the energy barriers of multielectron reactions for sodium-ion batteries

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Carbon Energy 2024年第9期6卷 1-14页

作者： Vaiyapuri Soundharrajan Sungjin kim Subramanian Nithiananth Muhammad H.Alfaruqi JunJi Piao Duong Tung Pham Vinod Mathew Sang A.Han Jung Ho kim jaekook kim Department of Materials Science and Engineering Chonnam National UniversityBukguGwangjuRepublic of Korea Graduate School of Science and Technology Shizuoka UniversityHamamatsuShizuokaJapan Departemen Teknik Metalurgi Universitas Teknologi SumbawaSumbawaIndonesia School of Engineering Physics Hanoi University of Science and TechnologyHanoiVietnam Institute for Superconducting and Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongNorth WollongongNew South WalesAustralia Research Center for Artificial Intelligence Assisted Ionics Based Materials Development Platform Chonnam National UniversityGwangjuRepublic of Korea

High electrochemical stability and safety make Na+superionic conductor(NASICON)-class cathodes highly desirable for Na-ion batteries(SIBs).However,their practical capacity is limited,leading to low specific ***,the low electrical conductivity combined with a decline in capacity upon prolonged cycling(>1000 cycles)related to the loss of active material-carbon conducting contact regions contributes to moderate rate performance and cycling *** need for high specific energy cathodes that meet practical electrochemical requirements has prompted a search for new ***,we introduce a new carbon-coated Na_(3)VFe_(0.5)Ti_(0.5)(PO_(4))_(3)(NVFTP/C)material as a promising candidate in the NASICON family of cathodes for *** a high specific energy of∼457 Wh kg^(-1) and a high Na+insertion voltage of 3.0 V versus Na^(+)/Na,this cathode can undergo a reversible single-phase solid-solution and two-phase(de)sodiation evolution at 28 C(1 C=174.7 mAh g^(-1))for up to 10,000 *** study highlights the potential of utilizing low-cost and highly efficient cathodes made from Earth-abundant and harmless materials(Fe and Ti)with enriched Na^(+)-storage properties in practical SIBs.

关键词： Fe and Ti swapping Na_(3)VFe_(0.5)Ti_(0.5)(PO_(4))_(3) prolonged cycle life structural stabilit

Synthesis of LiMnPO4 Nanocrystalline Materials

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Synthesis of LiMnPO4 Nanocrystalline Materials

Carbon-coated manganese dioxide nanoparticles and their enhanced electrochemical properties for zinc-ion battery applications

ICAM Workshop Physics of Novel Energy Materials

作者： jaekook kim Department of Materials Science and Engineering Chonnam National University

The olivine structured LiMPO4 (M = Fe, Mn, Co) is an excellent candidate for the cathode in rechargeable lithium batteries because of its environmentally benign, relatively high capacity of 170 mAh/g,

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Journal of Energy Chemistry 2017年第4期26卷 815-819页

作者： Saiful Islam Muhammad Hilmy Alfaruqi Jinju Song Sungjin kim Duong Tung Pham Jeonggeun Jo Seokhun kim Vinod Mathew Joseph Paul Baboo Zhiliang Xiu jaekook kim Department of Materials Science and Engineering Chonnam National University300 Yongbong-dongBukguGwangju 61186Republic of Korea

In this study, we report the cost-effective and simple synthesis of carbon-coated α-MnOnanoparticles(α-MnO@C) for use as cathodes of aqueous zinc-ion batteries(ZIBs) for the first time. α-MnO@C was prepared via a gel formation, using maleic acid(CHO) as the carbon source, followed by annealing at low temperature of 270 °C. A uniform carbon network among the α-MnOnanoparticles was observed by transmission electron microscopy. When tested in a zinc cell, the α-MnO@C exhibited a high initial discharge capacity of 272 m Ah/g under 66 m A/g current density compared to 213 m Ah/g, at the same current density, displayed by the pristine sample. Further, α-MnO@C demonstrated superior cycleability compared to the pristine samples. This study may pave the way for the utilizing carbon-coated MnOelectrodes for aqueous ZIB applications and thereby contribute to realizing high performance eco-friendly batteries.

关键词： Carbon coating Manganese dioxide Zinc-ion battery Electrochemical properties

A Critical Comparison of Mildly Acidic versus Alkaline Zinc Batteries

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Accounts of Materials Research 2023年第4期4卷 299-306页

作者： Vinod Mathew Noah B.Schorr Balaji Sambandam Timothy N.Lambert jaekook kim Chonnam National University Gwangju 61186South Korea Sandia National Laboratories AlbuquerqueNew Mexico 87185United States

Aqueous rechargeable batteries are cost-effective,easy to fabricate,and safe,deliver high energy output,and employ stable water-based electrolytes compared to organicbased lithium-ion batteries(LIBs).Aqueous Zn electrochemistry,specifically,has attracted researchers since the *** Zn is a nearly ideal anode owing to its low cost(ca.2 USD kg^(−1)),existing supply chain,environmental benignity,relative safety,and high stability in water[−0.76 V vs standard hydrogen electrode(SHE)],as compared to Li.^(1−3) The high theoretical capacity(2e−@820 mAh g^(−1))and low polarizability(6×10^(−8)Ωm)further motivate Zn-based battery development,especially for stationary storage.2,4 Alkaline Zn batteries(AZBs)and neutral/mildly acidic Znion batteries(MZIBs)are proposed as rivals to the established Pb-acid and LIBs owing to their competitive theoretical energy densities(∼200−400 Wh L^(−1)).The efficiency of these inexpensive and safe battery technologies is dependent on the cathode type,Zn anode formulation,separator materials,and the electrolyte type(liquid,gel,solid state)and *** AZBs and MZIBs have commonalities,including Zn dendrite formation at high capacity utilization and inherent low voltage(Zn battery<3 V

关键词： battery Zinc electrolyte