Silicon Composite Electrode for Lithium Insertion Cell: Theoretical and Experimental Investigation of Electrode Processes

摘要: Cell-Theoretical and Experimental Investigation of Electrode Processes Rajeswari Chandrasekaran, Alexandre Magasinski, Gleb Yushin, Thomas F.Fuller School Chemical & Biomolecular Engineering, Material Science Georgia Institute Technology, Center for Fuel Cell Battery Technologies, Tech Research Institute, Atlanta, GA 30332. Recent interest in rechargeable batteries EV, HEV PHEV applications has led to the investigation silicon as negative insertion material due its high specific energy (4200 mAh/g). Whereas earlier studies were at temperatures, it is only recently that lithiumsilicon systems have been investigated room temperature. Sluggish kinetics a low diffusion coefficient lithium bulk main barriers. Now, with shrinking electrode particle sizes nanoarchitectures, some problems overcome show promise practical applications. Both theory experiments be employed synergistically design better electrodes effective scale-up. This study aims provide framework this direction. The macro homogenous approach used model insertion/de-insertion composite electrode/separator/lithium foil cell. existing modified account porosity changes growth associated huge volume change electrodes. Since small are chosen, first approximation, stress neglected. Even though (and shrinkage) included, constant radius used, solid phase diffusion. Elsewhere, authors developed single analyze size during lithiation/ de-lithiation both current mode well cyclic voltammetry. Also, calculations if initial high, then dimensions along cell sandwich direction can assumed (as approximation) not significantly de-lithiation, thus reflected solely changes. Moreover, begin with, convection induced electrolyte A theoretical open-circuit potential curve simulations but an experimental will future work comparison purposes. simulated voltammogram (100 μV/s) given Figure 1 two different 50 μV/s 60 nm particle. corresponding state charge electrode/current collector interface 2 3 respectively.