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- Title
Activation and Stabilization of Mn‐Based Positive Electrode Materials by Doping Nonmetallic Elements.
- Authors
Mahara, Yuji; Oka, Hideaki; Nonaka, Takamasa; Kosaka, Satoru; Takahashi, Naoko Takechi; Kondo, Yasuhito; Makimura, Yoshinari
- Abstract
Disordered rock‐salt (DRS) type active materials are highly significant because of their large reversible capacities, which are due to their unique Li+ diffusion pathway and the redox capabilities of cationic transition metals (TMs) and anionic O ions. Loosely crystalline DRS materials have weak covalent bonds between TMs and O, increasing the O redox contribution and thereby enhancing their capacities. In this study, Mn‐based positive electrode materials with DRS structures are activated and stabilized by mechanochemical doping of nonmetallic elements P and B into interstitial sites. Synthesized Li0.90Mn0.84P0.04O2 (LMPO5) exhibits an initial discharge capacity of 346 mAh g−1 (1050 Wh kg−1) during charging/discharging. Li0.91Mn0.83B0.10O2 (LMBO5) has a moderately expanded lattice size, which facilitates high‐capacity retention during cycling (≈284 mAh g−1 at the 30th cycle). The structural properties of the synthesized active materials are extensively characterized. By introducing nonmetallic elements into the interstitial sites of Mn‐based materials, inexpensive, high‐capacity, and long‐cycling/calendar‐life Co/Ni‐free monometallic positive electrode materials may be further developed.
- Subjects
NONMETALS; DOPING agents (Chemistry); NONMETALLIC materials; ELECTRODES; COVALENT bonds; CATIONIC polymers
- Publication
Advanced Energy Materials, 2023, Vol 13, Issue 45, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202301843