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Pomegranate-type si/c anode with sic taped,well-dispersed tiny si particles for lithium-ion batteries

Journal of Advanced ceramics 2021年第5期10卷 1129-1139页

作者： Pengfei WU Benyang SHI Huibin TU changqing GUO Anhua LIU Guan YAN Zhaoju YU Key Laboratory of High-Performance ceramic Fibers of Ministry of Education College of MaterialsXiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China college of chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Severe volume expansion and inherently poor lithium ion transmission are two major problems of silicon anodes.To address these issues,we proposed a pomegranate-type si/c composite anode with highly dispersed tiny silicon particles as the core assisted by small amount of sic.Skillfully exploiting the high heat from magnesiothermic reduction,sic can assist the good dispersion of silicon and provide good interface compatibility and chemical stability.The silicon anchored to the carbon shell provides multipoint contact mode,that together with the carbon shell frame,significantly promoting the transfer of dual charge.Besides,the pomegranate-type microcluster structure also improves the tap density of the electrode,reduces the direct contact area between active material and electrolyte,and enhances the electrochemical performance.

关键词： si/c anode anchored si sic tape magnesiothermic reduction pomegranate like

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Synergistic protection of si anode based on multi-dimensional graphitic carbon skeletons

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Nano Research 2022年第9期15卷 8146-8155页

作者： Qitao Shi Haiming Wang Junhua Zhou HuyQuang Ta Jiaqi Wang Xueyu Lian Klaudia Kurtyka Barbara Trzebicka Thomas Gemming Mark H.Rümmeli Soochow Institute for Energy and Materials Innovation College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Institute for complex Materials IFW Dresden20 Helmholtz StrasseDresden 01069Germany centre of Polymer and carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Thomas Gemming-Institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic

Inspired by the natural corn structure,a si@hollow graphene shell@graphene(si@GS@G)anode material was prepared in which silicon nanoparticles were preliminarily anchored onto the surface of an elastic graphene shell and further constrained using graphene sheets.Hollow graphene oxide shells with abundant surficial hydrogen bonds,which were synthesized using a novel bottom-up method,were used as an intermediate material to anchor positively charged silicon nanoparticles via electrostatic attraction and achieve a rational spatial distribution.The inner hollow graphene shell anchorage and outer graphene constraint synergistically constituted a porous and robust conductive corn-like structure.The as-fabricated si@GS@G anode afforded efficient electron and ion transport pathways and improved structural stability,thereby enhancing Li+storage capability(505 mAh·g^(−1)at 10 A·g^(−1))and extending the lifespan compared to the single hollow graphene shell or graphene sheet-protected si anode(72%capacity retention after 500 cycles).The improved kinetics of the si@GS@G anode were investigated using electro impedance spectroscopy,galvanostatic intermittent titration,and pseudocapacitance contribution rate analysis,and the structural evolution was analyzed using ex situ electron microscopy.This study proposes a novel hollow graphene oxide shell as an activated intermediate material for designing a porous electrode structure that facilitates an enhanced electrochemical performance.

关键词： synergistic protection multi-dimensional graphitic carbons corn-like structure elastic skeleton si/c anode

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Sub-nanometer structured silicon-carbon composite nanolayers armoring on graphite for fast-charging and high-energy-density lithium-ion batteries

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Rare Metals 2023年第11期42卷 3692-3704页

作者： Zhen-Wei Li Mei-Sheng Han Jie Yu Songshan Lake Materials Laboratory Dongguan523808China Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenShenzhen 518055China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China

silicon/carbon composites are promising alternatives to current graphite anodes in commercial lithiumion batteries(LIBs)because of their high capacity and excellent safety.Nevertheless,the unsatisfactory fastcharging capability and cycle stability of si/c composites caused by slow charge transport capability and huge volume change under industrial electrode conditions severely hamper their development.Here,a novel si/c anode was fabricated by homogeneously depositing amorphous c-si nanolayers on graphite(c-si@graphite).c-si nanolayers with uniformly dispersed sub-nanometer si particles in 3D carbon skeleton significantly boost electron and Li-ion transport and efficiently relieve si's agglomeration and volume change.As a result,the tailored c-si@graphite electrodes show an excellent rate capacity(760.3 mAh·g^(-1)at 5.0c)and long cycle life of over 1000 cycles at 1.0c and800 cycles at 2.0c under industrial electrode conditions.In addition,the assembled full cells(c-si@graphite,anode;Li[Ni_(0.8)co_(0.1)Mn_(0.1)]O_(2),cathode)present superior fastcharging capability(240.4 Wh·kg^(-1),charging for16.2 min,3.0c)and long cycle life(80.7%capacity retention after 500 cycles at 1.0c),demonstrating the massive potential of c-si@graphite for practical application.

关键词： si/c anode Sub-nanometer si Fast-charging capability Lithium-ion batteries(LIBs)

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