Origin of the High Capacity Manganese-Based Oxyfluoride Electrodes for Rechargeable Batteries
- 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)
- Sorbonne Univ., Paris (France); Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France)
- Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France)
- College de France, Paris Cedex (France); Univ. of Antwerp, Antwerp (Belgium)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Reseau sur le Stockage Electrochimique de l'Energie (RS2E), Amicens (France); Univ. d'Orleans, Orleans Cedex (France)
- The Hong Kong Univ. of Science and Technology, Hong Kong (China)
- The Hong Kong Polytechnic Univ., Hong Kong SAR (China)
- 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
Web of Science
Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries
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journal | January 2019 |
Electrochemical properties of chromium oxyfluoride CrO 2−x F x with 0 ≤ x ≤ 0.3
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journal | January 2019 |
Multi-anionic and -cationic compounds: New high entropy materials for advanced Li-ion batteries
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other | January 2019 |
Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries
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other | January 2019 |
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