Characterization of gas diffusion electrodes for metal-air batteries

JOURNAL OF POWER SOURCES

卷:324

Article

Danner, Timo^1,2  Eswara, Santhana^3,4  Schulz, Volker P.⁵  Latz, Arnulf^1,2,6 

[1] German Aerosp Ctr DLR, Inst Engn Thermodynam, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

[2] Helmholtz Inst Ulm Electrochem Energy Storage HIU, Helmholtzstr 11, D-89081 Ulm, Germany

[3] Univ Ulm, Electron Microscopy Grp Mat Sci, Albert Einstein Allee 11, D-89081 Ulm, Germany

[4] Luxembourg Inst Sci & Technol, Adv Instrumentat Ion Nanoanalyt AINA MRT, Rue Brill 41, L-4422 Belvaux, Luxembourg

[5] Baden Wuerttemberg Cooperat State Univ Mannheim, Dept Engn, Coblitzallee 1-9, D-68163 Mannheim, Germany

[6] Univ Ulm, Inst Electrochem, Albert Einstein Allee 47, D-89081 Ulm, Germany

关键词: Lattice-Boltzmann method;    Gas diffusion electrodes;    FIB-SEM tomography;    Metal-air batteries;    Multiphase flow;   

DOI  :  10.1016/j.jpowsour.2016.05.108

来源: Elsevier

【 摘 要 】

Gas diffusion electrodes are commonly used in high energy density metal-air batteries for the supply of oxygen. Hydrophobic binder materials ensure the coexistence of gas and liquid phase in the pore network. The phase distribution has a strong influence on transport processes and electrochemical reactions. In this article we present 2D and 3D Rothman-Keller type multiphase Lattice-Boltzmann models which take into account the heterogeneous wetting behavior of gas diffusion electrodes. The simulations are performed on FIB-SEM 3D reconstructions of an Ag model electrode for predefined saturation of the pore space with the liquid phase. The resulting pressure-saturation characteristics and transport correlations are important input parameters for modeling approaches on the continuum scale and allow for an efficient development of improved gas diffusion electrodes. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free