| Autor: |
Stetson C; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States.; Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States., Huey Z; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States.; Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States., Downard A; Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States., Li Z; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., To B; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., Zakutayev A; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., Jiang CS; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., Al-Jassim MM; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., Finegan DP; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., Han SD; National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States., DeCaluwe SC; Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States. |
| Abstrakt: |
Nanoparticle silicon-graphite composite electrodes are a viable way to advance the cycle life and energy density of lithium-ion batteries. However, characterization of composite electrode architectures is complicated by the heterogeneous mixture of electrode components and nanoscale diameter of particles, which falls beneath the lateral and depth resolution of most laboratory-based instruments. In this work, we report an original laboratory-based scanning probe microscopy approach to investigate composite electrode microstructures with nanometer-scale resolution via contrast in the electronic properties of electrode components. Applying this technique to silicon-based composite anodes demonstrates that graphite, SiO x nanoparticles, carbon black, and LiPAA binder are all readily distinguished by their intrinsic electronic properties, with measured electronic resistivity closely matching their known material properties. Resolution is demonstrated by identification of individual nanoparticles as small as ∼20 nm. This technique presents future utility in multiscale characterization to better understand particle dispersion, localized lithiation, and degradation processes in composite electrodes for lithium-ion batteries. |
