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Title: Origin of the High Capacity Manganese-Based Oxyfluoride Electrodes for Rechargeable Batteries

Journal Article · · Chemistry of Materials
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8];  [9]
  1. College de France, Paris Cedex (France); The Hong Kong Univ. of Science and Technology, Hong Kong SAR (China); The Hong Kong Polytechnic Univ., Hong Kong SAR (China)
  2. Sorbonne Univ., Paris (France); Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France)
  3. Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France)
  4. College de France, Paris Cedex (France); Univ. of Antwerp, Antwerp (Belgium)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France); Univ. d'Orleans, Orleans Cedex (France)
  7. The Hong Kong Univ. of Science and Technology, Hong Kong (China)
  8. The Hong Kong Polytechnic Univ., Hong Kong SAR (China)
  9. College de France, Paris Cedex (France); Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France); Sorbonne Univ., Paris (France)

In the quest for high energy density rechargeable batteries, conversion-type cathode materials stand out with their appealing multielectron transfer properties. However, they undergo a series of complex phase transitions upon initial cycling as opposed to conventional intercalation-type materials. Within this category, iron-based mixed-anion solid solutions (FeOxF2-x) have captured the most attention of the battery community, owing to their high theoretical capacity and moderate cyclability. In the meantime, it was recently demonstrated, via a series of electrochemical cycling experiments, the in situ preparation of manganese-based mixed-anion cathode materials based on decomposition of electrolyte salt LiPF6 in the presence of MnO. To take a step forward, we herein report a routine protocol to prepare 220 mAh g-1-class composite cathodes. In addition, we provide a comprehensive understanding of the in situ fluorination and locally reversible phase transitions using complementary analytical techniques. The charged phase, with an average Mn oxidation state of ca. +2.8, consists of a highly disordered O-rich cubic-spinel-like core and an F-rich amorphous shell. Upon discharge, lithiation induces further phase transition, forming LiF, MnO, and a lithiated rocksalt-like phase. Furthermore this work, which we also extended to the iron-based system, offers insights into modification of chemical and electronic properties of electrode materials by in situ fluorination.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Agence Nationale de la recherche (ANR); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1480116
Journal Information:
Chemistry of Materials, Vol. 30, Issue 15; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (4)

Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries journal January 2019
Electrochemical properties of chromium oxyfluoride CrO 2−x F x with 0 ≤ x ≤ 0.3 journal January 2019
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

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