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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
 [1];  [2];  [2];  [3];  [4];  [1];  [2]
  1. Tsinghua Univ., Beijing (China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Michigan Technological Univ., Houghton, MI (United States)
  4. 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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New insights into the modification mechanism of Li-rich Li 1.2 Mn 0.6 Ni 0.2 O 2 coated by Li 2 ZrO 3 journal January 2016
Understanding the effect of an in situ generated and integrated spinel phase on a layered Li-rich cathode material using a non-stoichiometric strategy journal January 2016
Core–shell and concentration-gradient cathodes prepared via co-precipitation reaction for advanced lithium-ion batteries journal January 2017
Lithium diffusion study in Li 2 MnO 3 and Li 1.17 Ni 0.17 Mn 0.67 O 2 : a combined experimental and computational approach journal January 2017
Self-standing Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane as a binder-free cathode for Li-ion batteries journal January 2018
Mitigating oxygen release in anionic-redox-active cathode materials by cationic substitution through rational design journal January 2018
Li-Rich Layered/Spinel Cathode Composite 3/4[Li 2 MnO 3 ·LiCxO 2 ]·1/4[LiCxMnO 4 ] (Cx = Cr 1-y Co y ) for Li-Ion Batteries journal November 2018