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Title: Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries

Abstract

Cation-disordered Li-excess oxides/oxyfluorides have opened the door for designing alternative, high energy cathodes. However, achieving long cycle life and high rate capability represents a major challenge for disordered rocksalt cathodes (DRX). Herein, we develop Li2Mn3/4Cr1/4O2F (LMCOF) DRX materials through a distinct redox mechanochemical method. The LMCOF contains trivalent Cr3+ and Mn3+, which allows for simultaneously accessing stable Mn/Cr dual redox at a narrow voltage window acceptable for conventional carbonate electrolytes. Coupled with the mitigated and reversible oxygen chemical changes, the LMCOF delivers high capacity, rate capability, as well as long cycle life upon extensive 1,000 cycles at various current densities. Finally, the multiscale synchrotron and neutron scattering, spectroscopic, and imaging analyses demonstrate that the capacity originates from the Mn/Cr dual redox with minimal contribution from oxygen redox, and that the good cycle life is attributed to the stable global crystal structure and local oxygen chemical environment.

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [4];  [1];  [2]; ORCiD logo [2];  [5]; ORCiD logo [3];  [6];  [6];  [4]; ORCiD logo [3];  [7];  [3]; ORCiD logo [2]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Tianjin Univ. (China)
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Tianjin Univ. (China)
  5. Tianjin Univ. (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); Virginia Tech University
OSTI Identifier:
1807548
Alternate Identifier(s):
OSTI ID: 1822166
Grant/Contract Number:  
AC02-76SF00515; DMR-2045570; AC02-06CH1357; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 212; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; disordered rocksalt; high rate capability; long cycle life; dual redox; Li ion battery

Citation Formats

Zheng, Xuerong, Xu, Zhengrui, Li, Shaofeng, Zhang, Yuxin, Zhang, Jinfeng, Kuai, Chunguang, Tao, Lei, Rahman, Muhammad Mominur, Zhang, Yan, Lee, Sang-Jun, Sun, Cheng-Jun, Li, Luxi, Hu, Wenbin, Nordlund, Dennis, Liu, Jue, Liu, Yijin, and Lin, Feng. Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries. United States: N. p., 2021. Web. doi:10.1016/j.actamat.2021.116935.
Zheng, Xuerong, Xu, Zhengrui, Li, Shaofeng, Zhang, Yuxin, Zhang, Jinfeng, Kuai, Chunguang, Tao, Lei, Rahman, Muhammad Mominur, Zhang, Yan, Lee, Sang-Jun, Sun, Cheng-Jun, Li, Luxi, Hu, Wenbin, Nordlund, Dennis, Liu, Jue, Liu, Yijin, & Lin, Feng. Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries. United States. https://doi.org/10.1016/j.actamat.2021.116935
Zheng, Xuerong, Xu, Zhengrui, Li, Shaofeng, Zhang, Yuxin, Zhang, Jinfeng, Kuai, Chunguang, Tao, Lei, Rahman, Muhammad Mominur, Zhang, Yan, Lee, Sang-Jun, Sun, Cheng-Jun, Li, Luxi, Hu, Wenbin, Nordlund, Dennis, Liu, Jue, Liu, Yijin, and Lin, Feng. Sat . "Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries". United States. https://doi.org/10.1016/j.actamat.2021.116935. https://www.osti.gov/servlets/purl/1807548.
@article{osti_1807548,
title = {Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries},
author = {Zheng, Xuerong and Xu, Zhengrui and Li, Shaofeng and Zhang, Yuxin and Zhang, Jinfeng and Kuai, Chunguang and Tao, Lei and Rahman, Muhammad Mominur and Zhang, Yan and Lee, Sang-Jun and Sun, Cheng-Jun and Li, Luxi and Hu, Wenbin and Nordlund, Dennis and Liu, Jue and Liu, Yijin and Lin, Feng},
abstractNote = {Cation-disordered Li-excess oxides/oxyfluorides have opened the door for designing alternative, high energy cathodes. However, achieving long cycle life and high rate capability represents a major challenge for disordered rocksalt cathodes (DRX). Herein, we develop Li2Mn3/4Cr1/4O2F (LMCOF) DRX materials through a distinct redox mechanochemical method. The LMCOF contains trivalent Cr3+ and Mn3+, which allows for simultaneously accessing stable Mn/Cr dual redox at a narrow voltage window acceptable for conventional carbonate electrolytes. Coupled with the mitigated and reversible oxygen chemical changes, the LMCOF delivers high capacity, rate capability, as well as long cycle life upon extensive 1,000 cycles at various current densities. Finally, the multiscale synchrotron and neutron scattering, spectroscopic, and imaging analyses demonstrate that the capacity originates from the Mn/Cr dual redox with minimal contribution from oxygen redox, and that the good cycle life is attributed to the stable global crystal structure and local oxygen chemical environment.},
doi = {10.1016/j.actamat.2021.116935},
journal = {Acta Materialia},
number = ,
volume = 212,
place = {United States},
year = {Sat May 01 00:00:00 EDT 2021},
month = {Sat May 01 00:00:00 EDT 2021}
}

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