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Influences of Sintering Process of Sprayed Precursors on the Struc-ture and Electrochemical Properties of LiMn_2O_4 Cathode Material

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Journal of Materials Science & Technology 2008年第2期24卷 211-214页

作者： hui huang chen wang lei zhang yongping gan wenkui zhang College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310032 China

Well-defined spinel LiMn2O4 powders were synthesized via sintering a precursor, which was prepared by spraydrying method. The effects of sintering process on the structure and electrochemical properties of LiMn2O4 were discussed. It was found that a single sintering could not synthesize a pure LiMn2O4 compound, while two-step sintering procedure consisting of decomposing sprayed precursors at 350℃ and further sintering at an elevated temperature leads to the formation of a single-phased LiMn2O4 with homogeneous particle size distribution. As compared to that sintered in air, the two-step sintered LiMn2O4 in oxygen shows tighter structure and more uniform particle size, as well as better electrochemical properties. It delivers an initial discharge capacity of 131 mAh·g^-1 （1/10C）, and still has excellent cycling stability at higher rate （1/5C）.

关键词： Spinel LiMn2O4 Spray-drying method Li-ion batteries Sintering

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Plasma enhanced reduction method for synthesis of reduced graphene oxide fiber/Si anode with improved performance

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Chinese Chemical Letters 2024年第11期35卷 505-511页

作者： Yihong Li Zhong Qiu lei huang Shenghui Shen Ping Liu Haomiao zhang Feng Cao Xinping He Jun zhang Yang Xia Xinqi Liang chen wang wangjun Wan Yongqi zhang Minghua chen wenkui zhang hui huang yongping gan Xinhui Xia School of Materials Science&Engineering Zhejiang UniversityHangzhou 310027China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China School of Materials Science and&Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Engineering Technology Huzhou CollegeHuzhou 313000China Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 611371China Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China Zhejiang Academy of Science and Technology for Inspection&Quarantine Hangzhou 311215China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China

Silicon(Si)is considered as one of the most promising anode materials for advanced lithium-ion batteries due to its high theoretical capacity,environmental friendliness,and widespread ***,great challenges such as volumetric expansion,limited ionic/electronic conductivity properties and complex manufacturing processes hinder its practical ***,a novel plasma-enhanced reduced graphene oxide fibers/Si(PrGOFs/Si)composite anode is first proposed by using wet-spinning technology followed by plasma-enhanced reduction *** PrGOFs provide large space to accommodate the volume expansion of Si nanoparticles(SiNPs)by forming a flexible 3D conductive *** to the conventional thermally reduced graphene oxide fibers/Si(TrGOFs/Si)sample,the PrGOFs/Si anodes demonstrate higher conductivity,specific surface area,and superior fabrication ***,the Pr GOFs/Si anodes exhibit a reversible capacity of 698.3 mA h/g,and maintain a specific capacity of 602.5m Ah/g at a current density of 200 m A/g after 100 cycles,superior to conventional Tr GOFs/Si *** research presents a novel strategy for the preparation of high-performance Si/carbon anodes for energy storage applications.

关键词： Li ion batteries Si anode Plasma Graphene fibers Carbon

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