Ultrahigh capacity and superior stability of three-dimensional porous graphene networks containing in situ grown carbon nanotube clusters as an anode material for lithium-ion batteries. Issue 16 (7th April 2017)

• Record Type: Journal Article
• Authors: Huang, Shizhi; Wang, Jingyan; Pan, Zhiyi; Zhu, Jinliang; Shen, Pei Kang
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 16(2017)
• Page Start: 7595
• Page End: 7602
• Publication Date: 2017-04-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta11191b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Three-dimensional porous graphene networks containing in situ grown carbon nanotube clusters (CNTs@3DG) exhibited an ultrahigh capacity, remarkable rate performance and excellent cycling stability for lithium-ion batteries. Abstract : Three-dimensional porous graphene networks containing in situ grown carbon nanotube clusters (CNTs@3DG) with a superior composited nanostructure have been fabricated in a one-step metal-catalyzed thermolysis. The unique self-assembled 3D porous structure exhibits a high surface area (1673 m 2 g −1 ), a well-defined pore structure, as well as an excellent electronic conductivity. Inside the CNTs@3DG, abundant clusters of CNTs with an average size of 25 nm are in situ grown at the inner walls of porous graphene networks. The CNTs and graphene networks form a relatively stable architecture of 3D interconnected CNTs and graphene, which offers convenient channels for electron transport and lithium ion diffusion. This promising CNTs@3DG anode material reveals an ultrahigh reversible capacity of 1132 mA h g −1 and an advantageous retentive capacity of 1054 mA h g −1 after 200 cycles at 100 mA g −1 . More significantly, excellent reversible capacities of 720 and 663 mA h g −1 and superior long-cycle-life capacity decays of 0.017 and 0.025% per cycle after 1000 cycles were obtained at large current densities of 1 and 2 A g −1, respectively. It also exhibits a remarkable rate performance, including large capacities of 459 and 383 mA h g −1 at 4 and 5 A g −1 current densities, respectively.