Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 60, Issue -, Pages 176-179Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2015.09.010
Keywords
Battery; FIB-SEM tomography; Carbon-binder domain; Conductive additive; Microstructure
Categories
Funding
- BMR program of the U.S. Department of Energy
Ask authors/readers for more resources
FIB-SEM tomography is used to reconstruct the carbon-binder domain (CBD) of a LiCoO2 battery cathode (3.9 x 5 x 23 mu m(3)) with contrast enhancement by ZnO infiltration via atomic layer deposition. We calculate the porosity inside the CBD (57.6%), the cluster-size distribution with a peak at 54 nm, and the pore-size distribution with a peak at 64 nm. The tortuosities of the pore space (1.6-2.0) and the CBD (23-3.5) show a mild anisotropy, which is attributed to the fabrication process. A comparison to a modeled homogenous CBD reveals that clustering in the CBD decreases its electronic conductivity while increasing the ionic diffusivity. To account for the higher calculated diffusivity compared to experimental values from literature, a simple binder swelling model is implemented, suggesting a swelling of 75 vol%. The prevention of both clustering and swelling could increase the volume available for active material and therefore the energy density. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available