大倍率二氧化硅/碳复合材料的制备及电化学性能表征

doi:10.11896/j.issn.1005-023X.2018.03.002

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Abstract

High-rate SiO₂/C composite (called SiO₂-130/C) was synthesized using tetraethyl orthosilicate (TEOS) as SiO₂ precursor in a amphiphilic carbonaceous material (ACM)-polyethylene glycol 400(PEG 400) mixture. Confinement effect of smaller cells formed by ACM and PEG 400 on diameter of SiO₂ was studied. The results showed that the diameter of SiO₂ nanospheres was reduced from 500 nm (without confinement effect) to 130 nm (with confinement effect),and carbon framework resulting from carbon-rich ACM was constructed on the surface of SiO₂. Electrochemical performance of SiO₂-130/C composite was evaluated as anode material for lithium ion batteries. The reversible capacities of the SiO₂-130/C composite were 527 mAh ·g ^-1 and 347 mAh·g ^-1 at current densities of 0.1 A·g ^-1and 1 A·g ^-1, respectively. Moreover, the SiO₂-130/C composite, after the process of electrochemical activation, exhibited reversible capacitance as high as 483 mAh·g ^-1 at a current density of 1 A·g ^-1 over 400 cycles,indicating great rate performance and long-term cycling stability of the as-prepared SiO₂-130/C composite.

Key words： amphiphilic carbonaceous material SiO₂/C composite rate capability

Published: 10 February 2018 Online: 2018-02-10

CLC number:

TM912

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	Articles by authors
	Yanzhen WANG
	Mingming CHEN
	Chengyang WANG

Cite this article:

Yanzhen WANG,Mingming CHEN,Chengyang WANG. Preparation and Electrochemical Properties Characterization of High-rate SiO₂/C Composite Materials[J]. Materials Reports, 2018, 32(3): 357-361.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.03.002 OR https://www.mater-rep.com/EN/Y2018/V32/I3/357

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