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Title: Improved Cycling Performance of Li-Excess Cation-Disordered Cathode Materials upon Fluorine Substitution

Journal Article · · Advanced Energy Materials
 [1];  [1];  [2];  [3];  [4];  [5];  [3];  [4];  [1];  [6];  [3]; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of California, Berkeley, CA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We report the recent discovery of Li-excess cation-disordered rock salt cathodes has greatly enlarged the design space of Li-ion cathode materials. Evidence of facile lattice fluorine substitution for oxygen has further provided an important strategy to enhance the cycling performance of this class of materials. Here, a group of Mn3+–Nb5+-based cation-disordered oxyfluorides, Li1.2Mn3+0.6+0.5xNb5+0.2-0.5xO2-xFx (x = 0, 0.05, 0.1, 0.15, 0.2) is investigated and it is found that fluorination improves capacity retention in a very significant way. Combining spectroscopic methods and ab initio calculations, it is demonstrated that the increased transition-metal redox (Mn3+/Mn4+) capacity that can be accommodated upon fluorination reduces reliance on oxygen redox and leads to less oxygen loss, as evidenced by differential electrochemical mass spectroscopy measurements. Furthermore, it is found that fluorine substitution also decreases the Mn3+-induced Jahn–Teller distortion, leading to an orbital rearrangement that further increases the contribution of Mn-redox capacity to the overall capacity.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES); Robert Bosch GmbH; Umicore
Grant/Contract Number:
AC02-06CH11357; AC02‐05CH11231; AC02-05CH11231; NSF DMR 1720256
OSTI ID:
1493873
Alternate ID(s):
OSTI ID: 1482427
Journal Information:
Advanced Energy Materials, Vol. 9, Issue 2; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 119 works
Citation information provided by
Web of Science

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Cited By (6)

Effect of Fluorination on Lithium Transport and Short‐Range Order in Disordered‐Rocksalt‐Type Lithium‐Ion Battery Cathodes journal March 2020
A High‐Energy NASICON‐Type Cathode Material for Na‐Ion Batteries journal March 2020
Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry journal April 2020
Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry text January 2020
Multi-anionic and -cationic compounds: New high entropy materials for advanced Li-ion batteries other January 2019
Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries other January 2019