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Title: Another Strategy, Detouring Potential Decay by Fast Completion of Cation Mixing

Journal Article · · Advanced Energy Materials
 [1];  [2];  [1];  [3];  [4];  [5];  [3];  [6];  [7];  [1];  [4];  [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. for Renewable Energy, Beijing Key Lab. for New Energy Materials and Devices, Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
  2. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. for Renewable Energy, Beijing Key Lab. for New Energy Materials and Devices, Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics; Ningde Contemporary Amperex Technology Co. Limited (CATL) Fujian (China). Electric Vehicle Cells
  3. Chinese Academy of Sciences (CAS), Beijing (China). Lab. for Advanced Materials and Electron Microscopy, Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
  5. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. for Renewable Energy, Beijing Key Lab. for New Energy Materials and Devices, Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics
  6. Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Magnetism, Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics
  7. Beijing Univ. of Chemical Technology, Beijing (China). College of Science
+ Show Author Affiliations

Abstract The Li‐rich layer‐structured oxides are regarded one of the most promising candidates of cathode materials for high energy‐density Li‐ion batteries. However, the uninterrupted migration of the transition metal (TM) ions during cycling and the resultant continuous fading of their discharge potentials bring challenges to the battery design and impede their commercial applications. Various efforts have been taken to suppress the migration of the TM ions such as surface modification and elemental substitution, but no success has been achieved to date. Another strategy hereby is proposed to address these issues, in which the TM migration is promoted and the layered material is transformed to a rocksalt in the first few charge/discharge cycles by specially designing a novel Li‐rich layer‐structured Li 1.2 Mo 0.6 Fe 0.2 O 2 on the basis of density functional theory calculations. With such, the continuous falling of the discharge potential is detoured due to enhanced completion of the cation mixing. In‐depth studies such as aberration‐corrected scanning transmission electron microscopy confirm the drastic structural change at the atomic scale, and in situ X‐ray absorption spectroscopy and Mössbauer spectroscopy clarify its charge compensation mechanism. This new strategy provides revelation for the development of the Li‐rich layered oxides with mitigated potential decay and a longer lifespan.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
Grant/Contract Number:
SC0012704; DE‐SC0012704; DE‐AC02‐06CH11357
OSTI ID:
1425179
Alternate ID(s):
OSTI ID: 1420182
Report Number(s):
BNL-203319-2018-JAAM; TRN: US1802058
Journal Information:
Advanced Energy Materials, Vol. 8, Issue 15; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (2)

Li–Ti Cation Mixing Enhanced Structural and Performance Stability of Li‐Rich Layered Oxide journal July 2019
Eliminating Transition Metal Migration and Anionic Redox to Understand Voltage Hysteresis of Lithium‐Rich Layered Oxides journal January 2020

Figures / Tables (6)

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