期刊
CHEMISTRY OF MATERIALS
卷 34, 期 9, 页码 4153-4165出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.2c00522
关键词
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资金
- University of Birmingham
- European Union [883753]
- Faraday Institution [EP/S003053/1]
- Recycling of LiIon Batteries (ReLiB) project [FIRG005]
- CATMAT [FIRG016]
- MCIN/AEI [RTI2018095303-B-C51]
- ERDF A way of making Europe
- Comunidad de Madrid [S2018-NMT-4321]
A novel Sn-modified O3-type layered oxide cathode has been developed, demonstrating improved high-voltage stability through bulk Sn doping and surface coating in a one-step process, leading to enhanced cycling performance and capacity retention.
O3-type layered oxide materials are considered to be a highlysuitable cathode for sodium-ion batteries (NIBs) due to their appreciable specificcapacity and energy density. However, rapid capacity fading caused by seriousstructural changes and interfacial degradation hampers their use. A novel Sn-modified O3-type layered NaNi1/3Fe1/3Mn1/3O2cathode is presented, withimproved high-voltage stability through simultaneous bulk Sn doping and surfacecoating in a scalable one-step process. The bulk substitution of Sn4+stabilizes thecrystal structure by alleviating the irreversible phase transition and lattice structuredegradation and increases the observed average voltage. In the meantime, thenanolayer Sn/Na/O composite on the surface effectively inhibits surface parasiticreactions and improves the interfacial stability during cycling. A series of Sn-modified materials are reported. An 8%-Sn-modified NaNi1/3Fe1/3Mn1/3O2cathode exhibits a doubling in capacity retention increaseafter 150 cycles in the wide voltage range of 2.0-4.1 VvsNa/Na+compared to none, and 81% capacity retention is observed after200 cycles in a full cellvshard carbon. This work offers a facile process to simultaneously stabilize the bulk structure and interface forthe O3-type layered cathodes for sodium-ion batteries and raises the possibility of similar effective strategies to be employed forother energy storage materials
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