Performance Enhancement of Li4Ti5O12 and Si/C Electrodes Using Graphene/CMC Conductive Composite Binder

Tuesday, October 13, 2015
West Hall 1 (Phoenix Convention Center)
J. E. Lee, I. Y. Choi (University of Ulsan), and E. S. Oh (University of Ulsan)
Lithium titanium oxide (Li4Ti5O12, LTO) is a prospective anode material for high-powered and long-lasting Lithium Ion Batteries (LIBs) due to its fast cycle reversibility and zero-strain during charge/discharge processes. Despite these advantages, there is a major drawback that LTO has low electrical conductivity, leading to relatively worse performance at high current rates[1].

Another promising anode material for LIBs is silicon due to its very high capacity of 4200 mAh/g. However, the critical defect of silicon is huge volumetric change during charge/discharge processes, ultimately resulting in the isolation of silicon from conductive materials.

In order to overcome these problems, we try to enhance electrical conductivity of LTO and Si electrodes using a conductive composite binder, graphene/carboxymethyl cellulose (CMC). To evaluate the effect of the conductive composite binder, physical and electrochemical characteristics have been tested by FT-IR, cycle performance, rate capability, Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS), and so on.



1. Sang-Wook Han, So-Jin Kim, and Eun-Suok Oh, Journal of The Electrochemical Society, 161 (4) A587-A592 (2014)