1 School of Chemical Engineering and Technology, Peiyang Campus, Tianjin University, Tianjin 300350 2 Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University, Tianjin 300350 3 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072
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.
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2018, Vol. 32 
