Advanced Materials for Energy Conversion and Storage: Poster Session
Sponsored by: TMS Functional Materials Division, TMS: Energy Conversion and Storage Committee
Program Organizers: Amit Pandey, LG Fuel Cell Systems Inc.

Monday 6:00 PM
February 27, 2017
Room: Hall B1
Location: San Diego Convention Ctr

D-1: Perylene Polyimides-based Cathode Materials for High-capacity and Long-cycle Secondary Lithium-ion Batteries: Michael Rubyraj1; Ramalinga Viswanathan Mangalaraja1; Sambandam Anandan2; 1University of Concepcion; 2National Institute of Technology
    Perylene-dianhydrides (PTCDA) derived polyimides based organic cathode electrodes for high-power and long-cycle secondary lithium-ion batteries (LIBs) have gained attention owing to their good cycling stability and good rate capabilities. Here, we report a study on electron-rich pyrene group substituted at the 1,7-bay position of PTCDA polyimides as novel cathode organic materials for a secondary LIBs application. The synthesized perylene polyimides were characterized using various conventional techniques such as Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and cyclic voltammetry (CV) analyses. We demonstrated organic LIBs using these perylene polyimides as the cathode material and resulted in excellent electrochemical properties with high reversible capacity along with good rate of capability in the voltage range of 1.0 to 3.5 V vs Li+/Li. The resulting electrochemical performance along with structural flexibility of perylene dianhydride (PTCDA) based polyimides cathode materials offers new approaches to develop high-performance all-organic LIBs. FONDECYT Project No. 3160150, Santiago.

D-2: Tunable Oxygen-deficient Li4Ti5O12 Structure for High-performance Rechargeable Li-ion Batteries: Ralph Nicolai Nasara1; Shih-kang Lin1; 1National Cheng Kung University
    Utilizing a one pot, facile, and autogenic system, we are able to tune the defect nature and concentration, namely to engineer them, on our Lithium titanate (Li4Ti5O12) system. This plays an important role as Li4Ti5O12 is regarded as one of the most promising anode materials for lithium ion batteries (LIBs) because of its negligible volume change and stable operating voltage during charging/discharging; however, the intrinsic insulating property of Li4Ti5O12 hinders its high power applications. Therefore, the engineered defects offers optimizable enhancements to the electrochemical properties of Li4Ti5O12. The microstructures and electrochemical properties, i.e., cycle performance and rate-capability of these oxygen-deficient Li4Ti5O12 were examined. In addition, ab initio calculations based on density function theory (DFT) were performed to clarify contributions of the oxygen vacancies. The formation mechanism of the oxygen-deficient Li4Ti5O12 as well as the origin of superior electrochemical properties is elaborated in this presentation.