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Title: Anionic Redox Reaction-Induced High-Capacity and Low-Strain Cathode with Suppressed Phase Transition

Journal Article · · Joule
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Layered metal oxides have attracted widespread attention as cathodes for Na-ion batteries (NIBs) because of easy synthesis, highly reversible Na de-intercalation/intercalation and high energy density. However, most reported layered oxides suffer from a complex phase transition upon a large amount of Na de-intercalation. Here we report a P2-type layered oxide cathode Na0.72[Li0.24Mn0.76]O2, which exhibits exceptionally high initial charge capacity of ~210 mAh/g (0.72 Na) based on a pure Anionic Redox Reaction (ARR). Surprisingly, it is found that the global P2 structure can be maintained with minimal volume change (1.35%) upon complete removal of Na+ ions. This is due to the reduced Columbic repulsion associated with ARR and consequent suppression of the phase transition as observed in other P2-materials. Here we reveal for the first time that ARR has the functionality of stabilizing the structure, in addition to its role of increasing the capacity which has already been known. This would pave the way for the further improvement of high-energy-density NIBs.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
SC0012704; AC02-06CH11357; AC05-00OR22725; AC02-05CH11231
OSTI ID:
1600597
Alternate ID(s):
OSTI ID: 1477970; OSTI ID: 1482326
Report Number(s):
BNL-209182-2018-JAAM; BNL-209445-2018-JAAM; S2542435118305130; PII: S2542435118305130
Journal Information:
Joule, Journal Name: Joule Vol. 3 Journal Issue: 2; ISSN 2542-4351
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 175 works
Citation information provided by
Web of Science

Cited By (8)

Low-temperature synthesized Li 4 Mn 5 O 12 -like cathode with hybrid cation- and anion-redox capacities journal January 2019
Manganese‐Based Na‐Rich Materials Boost Anionic Redox in High‐Performance Layered Cathodes for Sodium‐Ion Batteries journal May 2019
A New P2‐Type Layered Oxide Cathode with Extremely High Energy Density for Sodium‐Ion Batteries journal February 2019
High‐Entropy Layered Oxide Cathodes for Sodium‐Ion Batteries journal January 2020
High‐Entropy Layered Oxide Cathodes for Sodium‐Ion Batteries journal January 2020
Electrochemical Performance Optimization of Layered P2‐Type Na 0.67 MnO 2 through Simultaneous Mn‐Site Doping and Nanostructure Engineering journal November 2019
Review on anionic redox in sodium-ion batteries journal January 2019
Dissociate lattice oxygen redox reactions from capacity and voltage drops of battery electrodes journal February 2020

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