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Project Title: Novel Electroanalytical Tools for Phase-Transformation Electrode Materials
Principle Investigator(s): Chunsheng Wang (Chemical & Biomolecular Engineering)
Abstract: Phase transformation (transition) materials (such as LiFePO4, Li4Ti5O12) with solute partitioning during ion insertion/extraction have received much attention as next-generation electrode materials for lithium ion batteries in power tools, electric vehicles (EV) and hybrid electric vehicles (HEV) because of their superior power capabilities. However, the origin of the exceptional rate performance is still controversial because the classic electroanalytical techniques, such as cyclic voltammetry (CV), potentiostatic intermittent titration (PITT), galvanostatic intermittent titration (GITT), and electrochemical impedance spectroscopy (EIS), cannot be used to analyze ion transportation in phase transformation materials. The objectives of this research are: (1) Development of new electroanalytical techniques for the kinetic analysis of phase transformation electrodes, (2) Exploration of next generation high power electrode materials using the developed electroanalytical techniques. The fundamental research on electroanalytical techniques for phase transformation electrodes will open a new window to explore the ultra-high power EV/HEV batteries. The electroanalytical techniques developed here are applicable for any ion insertion electrodes with a phase transformation (such as electrodes in Li-ion battery and in Ni/MH batteries).
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