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Title: Structural evolution at the oxidative and reductive limits in the first electrochemical cycle of Li1.2Ni0.13Mn0.54Co0.13O2

Journal Article · · Nature Communications
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [3];  [4]; ORCiD logo [4];  [5];  [6];  [7]; ORCiD logo [1]
  1. Collège de France (France); Sorbonne Université, 4 Place Jussieu, 75005, Paris, France; Sorbonne Univ., Paris (France); National Centre for Scientific Research-Mixed Organizations (CNRS-UMR), Paris (France)
  2. Skolkovo Inst. of Science and Technology, Moscow (Russia)
  3. Technische Univ. Munchen, Garching (Germany)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  5. Sorbonne Univ., Paris (France); National Centre for Scientific Research-Mixed Organizations (CNRS-UMR), Paris (France)
  6. National Centre for Scientific Research-Mixed Organizations (CNRS-UMR), Paris (France)
  7. National Centre for Scientific Research (CNRS), Paris (France)

High-energy-density lithium-rich materials are of significant interest for advanced lithium-ion batteries, provided that several roadblocks, such as voltage fade and poor energy efficiency are removed. However, this remains challenging as their functioning mechanisms during first cycle are not fully understood. Here we enlarge the cycling potential window for Li1.2Ni0.13Mn0.54Co0.13O2 electrode, identifying novel structural evolution mechanism involving a structurally-densified single-phase A’ formed under harsh oxidizing conditions throughout the crystallites and not only at the surface, in contrast to previous beliefs. We also recover a majority of first-cycle capacity loss by applying a constant-voltage step on discharge. Using highly reducing conditions we obtain additional capacity via a new low-potential P” phase, which is involved into triggering oxygen redox on charge. Altogether, these results provide deeper insights into the structural-composition evolution of Li1.2Ni0.13Mn0.54Co0.13O2 and will help to find measures to cure voltage fade and improve energy efficiency in this class of material.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1631047
Journal Information:
Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 74 works
Citation information provided by
Web of Science

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Figures / Tables (8)