Improve First-Cycle Efficiency and Rate Performance of Layered-Layered Li1.2Mn0.6Ni0.2O2 Using Oxygen Stabilizing Dopant
Journal Article
·
· ACS Applied Materials and Interfaces
- Tsinghua Univ., Beijing (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Michigan Technological Univ., Houghton, MI (United States)
- Michigan Technological Univ., Houghton, MI (United States)
The poor first-cycle Coulombic efficiency and rate performance of the Li-rich layered-layered oxides are associated with oxygen gas generation in the first activation charging and sluggish charge transportation along the layers. In this work, we report that barium doping improves the first-cycle efficiency of Li-rich layered-layered Li1.2Mn0.6Ni0.2O2 via suppression of the oxidation of O2– ions in the first charging. Furthermore, this effect can be attributed to the stabilizing effect of the barium cations on the oxygen radical intermediates generated during the oxidation of O2–. Meanwhile, because the stabilized oxygen radicals likely facilitate the charge transportation in the layered-layered structure, the barium-doped Li1.2Mn0.6Ni0.2O2 exhibits significant improvement in rate performance. Stabilizing the oxygen radicals could be a promising strategy to improve the electrochemical performance of Li-rich layered-layered oxides.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Electrical Energy Storage (CEES)
- Sponsoring Organization:
- National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1370832
- Alternate ID(s):
- OSTI ID: 1391669
- Journal Information:
- ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 29 Vol. 7; ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
barium doping
charge transport
materials and chemistry by design
electrodes
energy storage (including batteries and capacitors)
ions
layered-layered Li1.2Mn0.6Ni0.2O2
lithium ion battery
oxidation
oxygen releasing
stabilizing oxygen radicals
synthesis (novel materials)
transition metals doping
barium doping
charge transport
materials and chemistry by design
electrodes
energy storage (including batteries and capacitors)
ions
layered-layered Li1.2Mn0.6Ni0.2O2
lithium ion battery
oxidation
oxygen releasing
stabilizing oxygen radicals
synthesis (novel materials)
transition metals doping