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Flexible Graphene-Wrapped Carbon Nanotube/Graphene@MnO2 3D Multilevel Porous Film for High-Performance Lithium-Ion Batteries.
Small 2018; 14(32):e1801007S

Abstract

The ingenious design of a freestanding flexible electrode brings the possibility for power sources in emerging wearable electronic devices. Here, reduced graphene oxide (rGO) wraps carbon nanotubes (CNTs) and rGO tightly surrounded by MnO2 nanosheets, forming a 3D multilevel porous conductive structure via vacuum freeze-drying. The sandwich-like architecture possesses multiple functions as a flexible anode for lithium-ion batteries. Micrometer-sized pores among the continuously waved rGO layers could extraordinarily improve ion diffusion. Nano-sized pores among the MnO2 nanosheets and CNT/rGO@MnO2 particles could provide vast accessible active sites and alleviate volume change. The tight connection between MnO2 and carbon skeleton could facilitate electron transportation and enhance structural stability. Due to the special structure, the rGO-wrapped CNT/rGO@MnO2 porous film as an anode shows a high capacity, excellent rate performance, and superior cycling stability (1344.2 mAh g-1 over 630 cycles at 2 A g-1 , 608.5 mAh g-1 over 1000 cycles at 7.5 A g-1). Furthermore, the evolutions of microstructure and chemical valence occurring inside the electrode after cycling are investigated to illuminate the structural superiority for energy storage. The excellent electrochemical performance of this freestanding flexible electrode makes it an attractive candidate for practical application in flexible energy storage.

Authors+Show Affiliations

Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, P. R. China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30009580

Citation

Li, Sesi, et al. "Flexible Graphene-Wrapped Carbon Nanotube/Graphene@MnO2 3D Multilevel Porous Film for High-Performance Lithium-Ion Batteries." Small (Weinheim an Der Bergstrasse, Germany), vol. 14, no. 32, 2018, pp. e1801007.
Li S, Zhao Y, Liu Z, et al. Flexible Graphene-Wrapped Carbon Nanotube/Graphene@MnO2 3D Multilevel Porous Film for High-Performance Lithium-Ion Batteries. Small. 2018;14(32):e1801007.
Li, S., Zhao, Y., Liu, Z., Yang, L., Zhang, J., Wang, M., & Che, R. (2018). Flexible Graphene-Wrapped Carbon Nanotube/Graphene@MnO2 3D Multilevel Porous Film for High-Performance Lithium-Ion Batteries. Small (Weinheim an Der Bergstrasse, Germany), 14(32), pp. e1801007. doi:10.1002/smll.201801007.
Li S, et al. Flexible Graphene-Wrapped Carbon Nanotube/Graphene@MnO2 3D Multilevel Porous Film for High-Performance Lithium-Ion Batteries. Small. 2018;14(32):e1801007. PubMed PMID: 30009580.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Flexible Graphene-Wrapped Carbon Nanotube/Graphene@MnO2 3D Multilevel Porous Film for High-Performance Lithium-Ion Batteries. AU - Li,Sesi, AU - Zhao,Yunhao, AU - Liu,Zhengwang, AU - Yang,Liting, AU - Zhang,Jie, AU - Wang,Min, AU - Che,Renchao, Y1 - 2018/07/15/ PY - 2018/03/15/received PY - 2018/06/10/revised PY - 2018/7/17/pubmed PY - 2018/7/17/medline PY - 2018/7/17/entrez KW - Li-ion batteries KW - carbon nanotubes KW - graphene KW - hierarchically porous films KW - manganese dioxide SP - e1801007 EP - e1801007 JF - Small (Weinheim an der Bergstrasse, Germany) JO - Small VL - 14 IS - 32 N2 - The ingenious design of a freestanding flexible electrode brings the possibility for power sources in emerging wearable electronic devices. Here, reduced graphene oxide (rGO) wraps carbon nanotubes (CNTs) and rGO tightly surrounded by MnO2 nanosheets, forming a 3D multilevel porous conductive structure via vacuum freeze-drying. The sandwich-like architecture possesses multiple functions as a flexible anode for lithium-ion batteries. Micrometer-sized pores among the continuously waved rGO layers could extraordinarily improve ion diffusion. Nano-sized pores among the MnO2 nanosheets and CNT/rGO@MnO2 particles could provide vast accessible active sites and alleviate volume change. The tight connection between MnO2 and carbon skeleton could facilitate electron transportation and enhance structural stability. Due to the special structure, the rGO-wrapped CNT/rGO@MnO2 porous film as an anode shows a high capacity, excellent rate performance, and superior cycling stability (1344.2 mAh g-1 over 630 cycles at 2 A g-1 , 608.5 mAh g-1 over 1000 cycles at 7.5 A g-1). Furthermore, the evolutions of microstructure and chemical valence occurring inside the electrode after cycling are investigated to illuminate the structural superiority for energy storage. The excellent electrochemical performance of this freestanding flexible electrode makes it an attractive candidate for practical application in flexible energy storage. SN - 1613-6829 UR - https://www.unboundmedicine.com/medline/citation/30009580/Flexible_Graphene_Wrapped_Carbon_Nanotube/Graphene@MnO2_3D_Multilevel_Porous_Film_for_High_Performance_Lithium_Ion_Batteries_ L2 - https://doi.org/10.1002/smll.201801007 DB - PRIME DP - Unbound Medicine ER -