Elucidation of the Jahn-Teller effect in a pair of sodium isomer
- Univ. of Maryland, College Park, MD (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Jahn-Teller distorted Mn(III) (t2g3eg1) ions play a key role in the performance of manganese-based layered oxides. Here we show that there is an obvious relationship between the Jahn-Teller distortion of a trivalent manganese and the electrochemistry in a pair of Na isomer, namely orthorhombic and hexagonal P2-type Na2/3Mn0.9Ti0.1O2 having the same composition. It is found that more reversible phase transformations, higher working voltage and faster Na diffusion correlated with Jahn-Teller effect are found for distorted P02-Na2/3Mn0.9Ti0.1O2 upon Naþions extraction/insertion. Such Jahn-Teller distorted Mn assisted Na migration enables that the orthorhombic Na2/ 3Mn0.9Ti0.1O2 delivers a high specific capacity of 204.0 mA h g–1 with a 2.7 V average working voltage, reaching 550 Wh Kg–1–1 cycled at 10C) in Na cell in contrast with undistorted Na2/3Mn0.9Ti0.1O2. This strategy for understanding the Jahn-Teller effect of P2-type compounds at orbital energy level grasps new insight into designing high energy density positive electrode materials for Na-ion batteries.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- Grant/Contract Number:
- EE0008202; SC0012704
- OSTI ID:
- 1646592
- Alternate ID(s):
- OSTI ID: 1760502
OSTI ID: 1644330
- Report Number(s):
- BNL--216229-2020-JAAM
- Journal Information:
- Nano Energy, Journal Name: Nano Energy Vol. 77; ISSN 2211-2855
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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