Porous three-dimensional activated microwave exfoliated graphite oxide as an anode material for lithium ion batteries
Porous three-dimensional activated microwave exfoliated graphite oxide as an anode material for lithium ion batteries
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DOI：
10.1039/c6ra10142a
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发表时间：
2016-06
期刊：
影响因子：
3.9
通讯作者：
Xianjun Zhu;L. Zuo;Shuilin Wu;X. Qu;M. Wei;L. He;Y. Zhong;Yanwu Zhu
中科院分区：
文献类型：
--
作者：
Xianjun Zhu;L. Zuo;Shuilin Wu;X. Qu;M. Wei;L. He;Y. Zhong;Yanwu Zhu
通过微波剥离氧化石墨的化学活化制备了多孔石墨烯纳米片，其表面积高达~3100 m2 g−1。 sp2键合的碳具有连续的三维网络，该网络由高度弯曲的原子厚壁和约1至5纳米宽度的孔组成。作为锂离子电池负极材料，它在100 mA g−1 电流下可提供约1600 mA h g−1 的可逆比容量。为了了解锂存储机制，研究了具有可调比表面积的多孔碳样品。高可逆容量表明介孔和微孔是放电和充电过程中嵌入/脱嵌锂的关键因素。多孔结构和大比表面积被认为有助于实现高性能。
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.