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Aromatic Polyimide Based Composites for Ultrafast and Sustainable Lithium Ion Batteries

Wednesday, 16 May 2018
Ballroom 6ABC (Washington State Convention Center)
H. Lyu (Oak Ridge National Laboratory), J. Liu (Shandong University), S. Mahurin, S. Dai (Oak Ridge National Laboratory), Z. Guo (University of Tennessee Knoxville), and X. G. Sun (Oak Ridge National Laboratory)
Although lithium-ion batteries based on inorganic cathodes have been utilized in a wide range of applications, they still face challenges such as safety, power density and sustainability. Thus, efforts have been directed to look for alternative, greener and naturally abundant electrode materials for application in lithium ion batteries. As a result, different organic electrodes have been intensively investigated. Among them, aromatic polyimide is a very promising candidate with a theoretical capacity approaching 400 mA h g-1 and a working voltage around 2.5 V vs. Li/Li+. During the discharge process (lithium intake), aromatic polyimide can stepwise accept two electrons, resulting in the formation of a delocalized radical anion and dianion. Currently, there are two common issues preventing the practical application of aromatic polyimide. One is poor rate capability due to their low electronic conductivity and the other one is the rapid capacity fading during cycling due to the dissolution of the active organic cathodes. To overcome the intrinsic electrical insulation of aromatic polyimides and obtain high rate performance, highly conductive carbon additives such as graphene or carbon nanotubes and electron conductive polymers were used to make the polyimide composites. The effect of the type and the amount of conducting agents on the rate performance and long cycling stability of the aromatic polyimide composites based lithium ion batteries will be presented.