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Title: Surface-to-bulk redox coupling through thermally-driven Li redistribution in Li- and Mn-rich layered cathode materials

Journal Article · · Journal of the American Chemical Society
 [1];  [2];  [3]; ORCiD logo [4];  [2];  [5];  [5]; ORCiD logo [5];  [5]; ORCiD logo [6];  [6];  [7];  [2];  [2]; ORCiD logo [8]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [10];  [2] more »;  [2] « less
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Dalian Univ. of Technology, Dalian (China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  6. Stanford Univ., Stanford, CA (United States)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States); Pohang Accelerator Lab, Pohang (Republic of Korea)
  8. Dalian Univ. of Technology, Dalian (China)
  9. Univ. of Chinese Academy of Sciences, Beijing (China)
  10. Brookhaven National Lab. (BNL), Upton, NY (United States)

Li- and Mn-rich (LMR) layered cathode materials have demonstrated impressive capacity and specific energy density thanks to their intertwined redox centers including transition metal cations and oxygen anions. Although tremendous efforts have been devoted to the investigation of the electrochemically-driven redox evolution in LMR cathode at ambient temperature, their behavior under a mildly elevated temperature (up to ~100 °C), with or without electrochemical driving force, remains largely unexplored. Here we show a systematic study of the thermally-driven surface-to-bulk redox coupling effect in charged Li1.2Ni0.15Co0.1Mn0.55O2. We for the first time observed a charge transfer between the bulk oxygen anions and the surface transition metal cations under ~100 °C, which is attributed to the thermally-driven redistribution of Li ions. As a result, this finding highlights the non-equilibrium state and dynamic nature of the LMR material at deeply delithiated state upon a mild temperature perturbation.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); Chinese Scholarship Council (CSC)
Grant/Contract Number:
SC0012704; AC02-76SF00515; SC0012704; AC02-06CH11357
OSTI ID:
1542786
Alternate ID(s):
OSTI ID: 1659755; OSTI ID: 1688801; OSTI ID: 1594929
Report Number(s):
BNL--211864-2019-JAAM
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 30 Vol. 141; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Spatial quantification of dynamic inter and intra particle crystallographic heterogeneities within lithium ion electrodes journal January 2020
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Spatial quantification of dynamic inter and intra particle crystallographic heterogeneities within lithium ion electrodes journal January 2020
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