High-Rate Li+ Storage Capacity of Surfactant-Templated Graphene-TiO2 Nanocomposites. Issue 8 (1st January 2015)

• Record Type: Journal Article
• Authors: Hsieh, Andrew G.; Punckt, Christian; Aksay, Ilhan A.
• Is Part Of: Journal of the Electrochemical Society. Volume 162:Issue 8(2015)
• Page Start: A1566
• Page End: A1573
• Publication Date: 2015-01-01
• Subjects: graphene -- Lithium-ion Batteries -- surfactant -- titanium dioxide; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0481508jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Graphene-TiO2 nanocomposites are a promising anode material for Li-ion batteries due to their good high-rate capacity, inherent safety, and mechanical and chemical robustness. However, despite a large number of scientific reports on the material, the mechanism of the enhanced high-rate Li + storage capacity that results from the addition of graphene to TiO2 – typically attributed to improved electrical conductivity – is still not well understood. In this work, we focus on optimizing the processing of surfactant-templated graphene-TiO2 hybrid nanocomposites. Towards this end, we examine the influence of various processing parameters, in particular the surfactant-mediated colloidal dispersion of graphene, on the material properties and electrochemical performance of graphene-TiO2 . We investigate the influence of electrode mass loading on Li + storage capacity, focusing mainly on high-rate performance. Furthermore, we demonstrate an approach for estimating power loss during charge/discharge cycling, which offers a succinct method for characterizing the high-rate performance of Li-ion battery electrodes.