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EVENT:

Modeling Binder-free and Carbon-free High Energy Density LiCoO2 Electrodes for Rechargeable Lithium Batteries
Conferences & Talks

Electrochemical Society (ECS) 224th Annual Meeting

30 October 2013
11:40am-12:00pm
Hilton San Francisco Union Square, San Francisco, California

 

description

Conventional thin electrodes, by volume, contain a large amount of electrochemically inactive materials, which lowers the overall energy capacity of a cell, making it difficult to realize high volumetric energy with thin electrode architectures. Researchers have been actively pursuing methods which will enable the fabrication and full utilization of ultra-thick electrodes (< 200µm) in order to mitigate the amount of inactive material required in a cell. One approach which has emerged is to fabricate low tortuosity sintered electrode structures. This paper aims to correlate John Newman’s macro-homogeneous porous electrode model to thick high energy density carbon-free and binder-free sintered electrode samples fabricated at Palo Alto Research Center (PARC) and prior art studies on solid phase diffusion behavior [5] and tortuosity in LiCoO2. Zhang et al. have shown that it is often difficult to correlate a macro-homogeneous electrode model across all C-rates. Often new model extensions are created to capture better correlation at slow and fast C-rates. This is more difficult when one is dealing with a new materials set. We examine how assumptions about tortuosity and diffusion effect model predictions across a range of C-rates. Our efforts focus on understanding the model parameters which can be used in Newman’s existing model without significant modification to the underlying equations.