A facile synthesis of graphite/silicon/graphene spherical composite anode for lithium-ion batteries

• Published in: Electrochimica acta Vol. 104; pp. 117 - 123
• Main Authors: Gan, Lei, Guo, Huajun, Wang, Zhixing, Li, Xinhai, Peng, Wenjie, Wang, Jiexi, Huang, Silin, Su, Mingru
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2013
• Subjects: Anode; Anodes; Charge density; Electrodes; Graphene; Graphite; Lithium batteries; Lithium-ion batteries; Silicon; Spray drying; Transmission electron microscopy; Spray drying; Silicon; Anode; Graphene
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2013.04.083

•Graphite/Silicon@Graphene is synthesized via spray drying and subsequent annealing.•Thermal reduction of graphene oxide was used to obtain graphene.•Graphite and silicon are wrapped by graphene to form a spherical structure.•Graphene acts as a carbon matrix to buffer volume effect of silicon particles.•A more stable conductivity network is maintained by graphene. The Graphite/Silicon@reGO composite was synthesized via spray drying and subsequent annealing. According to XRD, Raman spectroscopy and FT-IR, graphene was demonstrated to be existed in the composite. Moreover, SEM and TEM were also used to illustrate the morphology of Graphite/Silicon@reGO. Used as anode for lithium-ion battery, it exhibited good cyclability with a high reversible charge capacity of 575.1mAhg−1 and showed a capacity retention ratio of 73.1% after 50 cycles at a current density of 50mAg−1. It also presented good rate capability at different rates of 50–1000mAg−1. EIS test showed that the composite electrode had a lower SEI resistance and charge-transfer resistance due to the existence of graphene.