|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||Electrochemical Characterization of Lithium Diffusion in Ordered Nanoporous Carbons via Voltage-relaxation GITT
||Waruni Jayawardana, Christopher Carr, Eric Majzoub
|On-Site Speaker (Planned)
Amorphous hard carbon materials for lithium ion battery anodes generally have capacities exceeding the 372 mAh/g of graphite, depending on their nanostructure. We have prepared several nanoporous carbons using synthesis techniques both with and without silica templates and tested their electrochemical properties, some with Li capacities in excess of 1200 mAh/g, suggesting plating of lithium inside the pores of the carbon nanostructure. We analyze the diffusion of Li in these carbons as a function of Li concentration using a novel voltage-relaxation (VR) technique related to the well-known current titration GITT. We show through VR-GITT analysis that the diffusion characteristics of these nanostructured carbons fall into two main categories defined by their synthesis with and without silica as a structure-directing component. Modeling of the diffusion process using Crank-Nickolson algorithms, and Monte Carlo determination of the lithium density profile in the particles during charging will be discussed.