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Porous three-dimensional activated microwave exfoliated graphite oxide as an anode material for lithium ion batteries
- Zhu, Xianjun, Zuo, Linwen, Wu, Shuilin, Qu, Xiaodi, Wei, Meng, He, Li, Zhong, Yu, Zhu, Yanwu
- RSC advances 2016 v.6 no.60 pp. 55176-55181
- anodes, graphene, lithium batteries, micropores, nanosheets, surface area
- A porous graphene nanosheet, with a Brunauer–Emmett–Teller surface area of up to ∼3100 m² g⁻¹, is prepared by using chemical activation of microwave exfoliated graphite oxide. The sp²-bonded carbon has a continuous three-dimensional network of highly curved atom-thick walls with ∼1 to 5 nm width pores. As an anode material for lithium ion batteries, it can deliver a reversible specific capacity of ~1600 mA h g⁻¹ at the current of 100 mA g⁻¹. To understand the Li storage mechanism, porous carbon samples with tunable specific surface area were investigated. The high reversible capacity indicates that the meso- and micropores are the key factor for Li insertion/extraction during discharging and charging. The porous structure and large specific surface area is believed to have contributed to the high performance.