Journal ArticleDOI
Facile Synthesis of Si@SiC Composite as an Anode Material for Lithium-Ion Batteries.
TLDR
An outstanding electrochemical performance of Si@SiC-0.5 is attributed to the SiC phase, which acts as a buffer layer that stabilizes the nanostructure of the Si active phase and enhances the electrical conductivity of the electrode.Abstract:
Here, we propose a simple method for direct synthesis of a Si@SiC composite derived from a SiO2@C precursor via a Mg thermal reduction method as an anode material for Li-ion batteries. Owing to the extremely high exothermic reaction between SiO2 and Mg, along with the presence of carbon, SiC can be spontaneously produced with the formation of Si. The synthesized Si@SiC was composed of well-mixed SiC and Si nanocrystallites. The SiC content of the Si@SiC was adjusted by tuning the carbon content of the precursor. Among the resultant Si@SiC materials, the Si@SiC-0.5 sample, which was produced from a precursor containing 4.37 wt % of carbon, exhibits excellent electrochemical characteristics, such as a high first discharge capacity of 1642 mAh g–1 and 53.9% capacity retention following 200 cycles at a rate of 0.1C. Even at a high rate of 10C, a high reversible capacity of 454 mAh g–1 was obtained. Surprisingly, at a fixed discharge rate of C/20, the Si@SiC-0.5 electrode delivered a high capacity of 989 mAh g...read more
Citations
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Journal ArticleDOI
Fabrication and understanding of Cu3Si-Si@carbon@graphene nanocomposites as high-performance anodes for lithium-ion batteries
Zhiming Zheng,Hong-Hui Wu,Huixin Chen,Yong Cheng,Qiaobao Zhang,Qingshui Xie,Laisen Wang,Kaili Zhang,Ming-Sheng Wang,Dong-Liang Peng,Xiao Cheng Zeng +10 more
TL;DR: In this design, the carbon shell, the highly elastic graphene nanosheet, and the formed conductive and inactive Cu3Si phase in Si serve as buffer media to suppress volume variation of Si during lithiation/delithiation processes and to facilitate the formation of a stable solid electrolyte interface (SEI) layer as well as to enable good transport kinetics.
Journal ArticleDOI
Silicon/carbon lithium-ion battery anode with 3D hierarchical macro-/mesoporous silicon network: Self-templating synthesis via magnesiothermic reduction of silica/carbon composite
Xiuxia Zuo,Xiaoyan Wang,Yonggao Xia,Shanshan Yin,Shanshan Yin,Qing Ji,Qing Ji,Zhaohui Yang,Meimei Wang,Xiaofang Zheng,Bao Qiu,Zhaoping Liu,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng,Ya-Jun Cheng +15 more
TL;DR: In this paper, a 3D hierarchical macro-mesoporous SiO2/C composite is proposed to improve the cyclic performance of the Si anodes by using a self-templating mechanism during the reduction process.
Journal ArticleDOI
Silicon core-mesoporous shell carbon spheres as high stability lithium-ion battery anode
TL;DR: Compared to bare Si anode, the SCMSC anode exhibits much higher Li storage capacity, superior cyclability, and good rate capability, highlighting the advantages of hierarchical MSC in theSCMSC structure.
Journal ArticleDOI
Designing of hierarchical mesoporous/macroporous silicon-based composite anode material for low-cost high-performance lithium-ion batteries
TL;DR: In this paper, a mass-produced and low-cost hierarchical mesoporous/macroporous silicon-based composite material with an ample porous structure and dual carbon protective layers has been rationally designed and constructed.
Proceedings ArticleDOI
Achievements And Perspectives Of Fiber Gyros
TL;DR: In this article, the concept of inertial fiber motion sensors based upon the Kennedy-Thorndike interferometer is introduced, which can enable inertial strapdown navigation without accelerometers.
References
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Journal ArticleDOI
Highly Ordered Mesoporous Silicon Carbide Ceramics with Large Surface Areas and High Stability
Yifeng Shi,Yan Meng,Dehong Chen,Shujiang Cheng,Peng Chen,Haifeng Yang,Ying Wan,Dongyuan Zhao +7 more
TL;DR: In this article, a 3D bicontinuous cubic mesoporous SiC structure (Ia3d) was constructed from a 2D hexagonal SiC nanowire array.
Journal ArticleDOI
Mass-scalable synthesis of 3D porous germanium–carbon composite particles as an ultra-high rate anode for lithium ion batteries
TL;DR: In this article, a 3D nano-architecture of Ge coated with carbon (3D-Ge/C) via a carbothermal reduction method in an inert atmosphere was presented.
Journal ArticleDOI
Electrospray Synthesis of Silicon/Carbon Nanoporous Microspheres as Improved Anode Materials for Lithium-Ion Batteries
TL;DR: In this article, an optimized nanostructure design of Si-based anode material for high-performance lithium-ion batteries is realized in the form of Si/C nanoporous microspheres.
Journal ArticleDOI
Advances in the Application of Silicon and Germanium Nanowires for High‐Performance Lithium‐Ion Batteries
TL;DR: Some of the key developments in this area are looked at, focusing on the problems encountered by Li-alloying electrodes in general and how the study of nanowire electrodes has overcome these issues.
Journal ArticleDOI
Delicate Structural Control of Si–SiOx–C Composite via High-Speed Spray Pyrolysis for Li-Ion Battery Anodes
Seung Jong Lee,Hye-jin Kim,Tae Hoon Hwang,Sunghun Choi,Sung Hyeon Park,Erhan Deniz,Dae Soo Jung,Jang Wook Choi +7 more
TL;DR: Spray pyrolysis to prepare Si-SiOx composite using an aqueous precursor solution containing Si nanoparticles, citric acid, and sodium hydroxide (NaOH) exhibited excellent electrochemical performance, such as reversible capacity and ICE.