Thursday, 23 June 2016
Riverside Center (Hyatt Regency)
Increasing demands for utilization of intermittent renewable energy resources, cost effective, safe and long cycle life electrochemical energy storage is required. Currently, lithium-ion batteries are identified as strong contender to fulfill the future energy requirements for electric vehicle as well as stationary energy storage applications due to high voltage, energy density, and long cycle life. However, state-of-the-art lithium ion battery technology still needs improvements in terms of cost, safety, power and cycle life. For stationary application, energy density is not as critical as that for vehicle application but long cycle life and safety is required. The spinel-type lithium titanium oxide, Li4Ti5O12 is attractive as an alternative to graphite anode for advanced lithium-ion batteries, due to the reversible Li insertion and extraction property at around 1.55 V (versus Li/Li+) with so called zero strain behavior. Even though this redox potential is far higher than that of graphite or carbonaceous materials, the good cyclability of Li cells has favored its commercialization. Although the structural restriction of the spinel structure limits the theoretical capacity to 175 mAh/g, various forms of titanate compounds exists such as H2Ti6O12, H2Ti12O25 and TiO2(B) with a higher theoretical capacity up to 335 mAh/g. In our presentation, electrochemical performance of Li-ion pouch cell using NMC cathode and AlF3 coated Li4Ti5O12 anode combination will be presented. Furthermore, structural investigations and electrochemical performances of other titanate based anodes will be discussed.