Improvement of charge/discharge performance for lithium ion batteries with tungsten trioxide electrodes

batteries with tungsten trioxide electrodes W. Li1, A. Sasaki1,3, H. Oozu3, K. Aoki3, K. Kakushima2, Y. Kataoka2, A. Nishiyama2, N. Sugii2, H. Wakabayashi2, K. Tsutsui2, K. Natori1, H. Iwai1 Tokyo Tech. FRC 1, Tokyo Tech IGSSE 2, Toshiba Material Co., LTD, Introduction The charge/discharge time of rechargeable lithium ion batteries (LIBs) is becoming increasingly important in evaluating the performance of batteries for their use in electric vehicles and other applications. Although much effort has been made to study Li ion transportation to increase the charge/discharge speed, there has been little research on electron conduction to our knowledge. In this work, we attempted to increase the charge/discharge speed of LIBs from the viewpoint of electron conduction in the electrodes. Tungsten trioxide (WO3) was chosen for the electrodes in this study owing to its high reversibility. Besides, simple N2 annealing treatment can improve electron conduction of WO3 as shown in Fig.1 Device Fabrication Results and Discussion Fig.1 ρ versus 1000/T after N2 annealing at different temperatures (T: measurement temperature (ranging from 443 to 243 K)).