Nanostructured Solid-State Energy Storage Devices for Wide-Temperature Applications in Space Exploration Wichita State University/NASA Ames Research Center, Human Exploration & Operations Mission Directorate, Space Technology Mission Directorate
A multiscale hierarchical lithium-ion battery (LIB) anode composed of Si shells coaxially coated on vertically aligned carbon nanofibers (VACNFs) has been explored. A high Li storage capacity of ~3,000-3,500 mAh (gSi)-1 and 99.8% Coulombic efficiency have been obtained. Remarkable stability over 500 charge-discharge cycles have been demonstrated. Particularly, this electrode presents a high-rate capability that the capacity remains within ~7% as the C-rate is increased by 80 times from ~C/10 to ~8C. Electron microscopy, Raman spectroscopy and electrochemical impedance spectroscopy revealed that the electrode structure remains stable during long cycling. This high-rate property has been attributed to the unique nanocolumnar structure of Si in the shell. It reveals an exciting potential to develop high-performance LIBs by improving the electron and ion transport across solid electrode materials through the multiscale architecture hybrid materials. See the article by S. Klankowski et al in J. Power Sources (http://dx.doi.org/10.1016/j. jpowsour.2014.11.094).
The multiscale architectured Li-ion battery anode based on nanocolumnar Si anchored on the surface of a vertically aligned carbon nanofiber array.
Meyya Meyyappan, Ph.D, NASA Technical Monitor, Ames Research Center, STMD www.nasa.gov/epscor/stimuli
Dr. Jun Li, Science PI, Wichita State University NASA EPSCoR Stimuli 2014-15
Published on Dec 14, 2015
NASA Office of Education’s Aerospace Research & Career Development (ARCD) is pleased to release NASA EPSCoR Stimuli, a collection of univers...