Engineering the surface of LiCoO2 electrodes using atomic layer deposition for stable high-voltage lithium ion batteries
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Here, developing advanced technologies to stabilize positive electrodes of lithium ion batteries under high-voltage operation is becoming increasingly important, owing to the potential to achieve substantially enhanced energy density for applications such as portable electronics and electrical vehicles. Here, we deposited chemically inert and ionically conductive LiAlO2 interfacial layers on LiCoO2 electrodes using the atomic layer deposition technique. During prolonged cycling at high-voltage, the LiAlO2 coating not only prevented interfacial reactions between the LiCoO2 electrode and electrolyte, as confirmed by electrochemical impedance spectroscopy and Raman characterizations, but also allowed lithium ions to freely diffuse into LiCoO2 without sacrificing the power density. As a result, a capacity value close to 200 mA·h·g–1 was achieved for the LiCoO2 electrodes with commercial level loading densities, cycled at the cut-off potential of 4.6 V vs. Li+/Li for 50 stable cycles; this represents a 40% capacity gain, compared with the values obtained for commercial samples cycled at the cut-off potential of 4.2 V vs. Li+/Li.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1419766
- Journal Information:
- Nano Research, Vol. 10, Issue 11; ISSN 1998-0124
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Structure/Interface Coupling Effect for High-Voltage LiCoO2 Cathodes
Multi-scale stabilization of high-voltage LiCoO2 enabled by nanoscale solid electrolyte coating