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Title: Elucidation of the Jahn-Teller effect in a pair of sodium isomer

Journal Article · · Nano Energy

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 Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
Grant/Contract Number:
SC0012704; EE0008202
OSTI ID:
1646592
Alternate ID(s):
OSTI ID: 1644330
Report Number(s):
BNL-216229-2020-JAAM
Journal Information:
Nano Energy, Vol. 77; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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