VO2(B)/Graphene Forest for High-Rate Li-Ion Battery. Issue 1773 (2015)

• Record Type: Journal Article
• Authors: Ren, Guofeng; Fan, Zhaoyang
• Editors: Chan, C.K.; Co, A.; Tüysüz, H.; Xiong, H.
• Is Part Of: MRS proceedings. Issue 1773(2015)
• Page Start: 7
• Page End: 14
• Publication Date: 2015
• Subjects: energy storage, -- nanostructure, -- hydrothermal; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2015.536
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: 2D nanomaterials, when assembled into an ordered macrostructure, will present many great opportunities, including for Li-ion batteries (LIBs). We report densely-packed vertically-aligned VO2 (B) nanobelts (NBs)-based forest structure synthesized on edge-oriented graphene (EOG) network. Using a EOG/Ni foam as a 3D scaffold, aligned VO2 (B) NBs can be further synthesized into a folded 3D forest structure to construct a freestanding electrode for LIBs. Electrochemical studies found that such a freestanding VO2 (B)/EOG electrode, which combines the unique merits of 2D VO2 (B) NBs and 2D graphene sheets, has excellent charge-discharge rate performance. A discharge capacity of 178 mAh g -1 at a rate of 59 C and 100 mAh g -1 at 300 C was measured. A good charge-discharge cycling stability under a high current density was also demonstrated. The results indicate VO2 (B)/EOG forest based freestanding electrode is very promising for developing high-rate LIBs.