空心石墨烯球的简便合成及其作为锂离子电池阳极材料的电化学性能。

Facile synthesis and electrochemical performances of hollow graphene spheres as anode material for lithium-ion batteries.

机构信息

State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.

State Grid Smart Grid Research Institute, Beijing 102211, China.

出版信息

Nanoscale Res Lett. 2014 Jul 28;9(1):368. doi: 10.1186/1556-276X-9-368. eCollection 2014.

DOI:10.1186/1556-276X-9-368

PMID:25114657

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4119061/

Abstract

UNLABELLED

The hollow graphene oxide spheres have been successfully fabricated from graphene oxide nanosheets utilizing a water-in-oil emulsion technique, which were prepared from natural flake graphite by oxidation and ultrasonic treatment. The hollow graphene oxide spheres were reduced to hollow graphene spheres at 500°C for 3 h under an atmosphere of Ar(95%)/H2(5%). The first reversible specific capacity of the hollow graphene spheres was as high as 903 mAh g(-1) at a current density of 50 mAh g(-1). Even at a high current density of 500 mAh g(-1), the reversible specific capacity remained at 502 mAh g(-1). After 60 cycles, the reversible capacity was still kept at 652 mAh g(-1) at the current density of 50 mAh g(-1). These results indicate that the prepared hollow graphene spheres possess excellent electrochemical performances for lithium storage. The high rate performance of hollow graphene spheres thanks to the hollow structure, thin and porous shells consisting of graphene sheets.

PACS

81.05.ue; 61.48.Gh; 72.80.Vp.

摘要

未标记

通过水包油乳液技术，成功地从氧化石墨烯纳米片制备出空心氧化石墨烯球，该氧化石墨烯纳米片是由天然鳞片石墨经过氧化和超声处理得到的。在 Ar(95%)/H2(5%)气氛下，将空心氧化石墨烯球在 500°C 下还原 3 小时，得到空心石墨烯球。空心石墨烯球在 50 mAh g(-1)的电流密度下的首次可逆比容量高达 903 mAh g(-1)。即使在 500 mAh g(-1)的高电流密度下，可逆比容量仍保持在 502 mAh g(-1)。经过 60 次循环后，在 50 mAh g(-1)的电流密度下，可逆容量仍保持在 652 mAh g(-1)。这些结果表明，所制备的空心石墨烯球具有优异的电化学储锂性能。空心石墨烯球的高倍率性能得益于其空心结构、由石墨烯片组成的薄而多孔的壳。