Effect of electrochemical cycling on microstructures of nanocomposite silicon electrodes using hyperpolarized 129Xe and 7Li NMR spectroscopy
Journal Article
·
· Journal of Vacuum Science and Technology A
- Brown Univ., Providence, RI (United States); Brown Univ., Providence, RI (United States)
- Univ. of Connecticut, Storrs, CT (United States)
- Brown Univ., Providence, RI (United States)
The microstructural stability of composite electrodes during electrochemical cycling is critically important as it dictates the performance of Li-ion batteries. The issue becomes even more important for the high capacity alloying anode such as silicon that typically exhibits dramatic lithiation–delithiation-induced volume changes. The solid electrolyte interphase (SEI) layer formed on the active electrode surface has a profound effect on the overall microstructural stability of composite electrodes. An ideal SEI layer allows Li+ ions in and out of the electrode, but is an insulator to electrons, preventing the electrolyte from being further reduced. However, the SEI layers formed during initial lithiation may experience changes or degradation with subsequent cycling, adversely affecting the electrode performance. A combination of hyperpolarized 129Xe and 7Li nuclear magnetic resonance spectroscopies was applied to probe the microstructures of nanocomposite silicon electrodes at various stages of the lithiation–delithiation cycle. The results obtained from this study shed light on the degradation mechanism of nanocomposite Si electrodes upon electrochemical cycling and should prove useful in the effort to design more robust electrodes in the future.
- Research Organization:
- Brown Univ., Providence, RI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0007074
- OSTI ID:
- 1980710
- Journal Information:
- Journal of Vacuum Science and Technology A, Journal Name: Journal of Vacuum Science and Technology A Journal Issue: 4 Vol. 40; ISSN 0734-2101
- Publisher:
- American Vacuum Society / AIPCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of Solid Electrolyte Interphase Formed on Si Nanoparticle Composite Electrodes Using Hyperpolarized 129Xe Nuclear Magnetic Resonance Spectroscopy
Capacity Fading Mechanisms of Silicon Nanoparticle Negative Electrodes for Lithium Ion Batteries
The Impact of Initial SEI Formation Conditions on Strain‐Induced Capacity Losses in Silicon Electrodes
Journal Article
·
Sun Apr 02 20:00:00 EDT 2017
· Energy and Fuels
·
OSTI ID:1534483
Capacity Fading Mechanisms of Silicon Nanoparticle Negative Electrodes for Lithium Ion Batteries
Journal Article
·
Tue Sep 15 20:00:00 EDT 2015
· Journal of the Electrochemical Society
·
OSTI ID:1454696
The Impact of Initial SEI Formation Conditions on Strain‐Induced Capacity Losses in Silicon Electrodes
Journal Article
·
Wed Dec 12 19:00:00 EST 2018
· Advanced Energy Materials
·
OSTI ID:1485707