Sandwiched graphene inserted with graphene-encapsulated yolk–shell γ-Fe2O3 nanoparticles for efficient lithium ion storage

Miao Zhang; Enzuo Liu; Tingting Cao; Huayu Wang; Chunsheng Shi; Jiajun Li; Chunnian He; Fang He; Liying Ma; Naiqin Zhao

doi:10.1039/C7TA01239J

Sandwiched graphene inserted with graphene-encapsulated yolk–shell γ-Fe₂O₃ nanoparticles for efficient lithium ion storage†

Miao Zhang,^a Enzuo Liu,^a Tingting Cao,^a Huayu Wang,^a Chunsheng Shi,^a Jiajun Li,^a Chunnian He,

^ab Fang He,^a Liying Ma*^a and Naiqin Zhao

*^ab

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* Corresponding authors

^a School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, China
E-mail: lyma@tju.edu.cn, nqzhao@tju.edu.cn

^b Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

Abstract

A convenient and scalable in situ chemical vapor deposition (CVD) method is developed for one-step fabrication of sandwiched graphene sheets which were filled with yolk–shell γ-Fe₂O₃ nanoparticles encapsulated with graphene shells (YS-γ-Fe₂O₃@G-GS). Such a unique architecture can be applied to produce an excellent lithium ion battery (LIB) anode. As a result, long-term cycling stability at high rates (a high capacity of 663.7 mA h g⁻¹ is achieved at 2 A g⁻¹ and maintained at approximately 96.6% even after 1500 cycles) and superior rate capability (1173 mA h g⁻¹ at 0.1C, 989 mA h g⁻¹ at 0.2C, 827 mA h g⁻¹ at 0.5C, 737 mA h g⁻¹ at 1C, 574 mA h g⁻¹ at 2C, 443 mA h g⁻¹ at 5C, and 350 mA h g⁻¹ at 10C; 1C = 1 A g⁻¹) can be obtained when YS-γ-Fe₂O₃@G-GS is used as an LIB anode. As far as we know, this is the best rate capacity and longest cycle life ever reported for an Fe₂O₃-based LIB anode.

This article is part of the themed collection: 2017 Journal of Materials Chemistry A HOT Papers

Journal of Materials Chemistry A

Sandwiched graphene inserted with graphene-encapsulated yolk–shell γ-Fe₂O₃ nanoparticles for efficient lithium ion storage†

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Journal of Materials Chemistry A