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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.