Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 46, Pages 23261-23267Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05769h
Keywords
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Funding
- NSAF [U1430104]
- 973 Program of China [2011CB933300]
- Science & Technology Commission of Shanghai Municipality [08DZ2270500, 11JC 1400500]
- National Foundation of China [B1120132029]
- U.S. Department of Energy, Office of Vehicle Technologies [DE-SC0012704]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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High rate capability and long cycle life are challenging goals for the development of room temperature sodium-ion batteries. Here we report a new single phase quaternary O3-type layer-structured transition metal oxide Na(NiCoFeTi)(1/4)O-2 synthesized by a simple solid-state reaction as a new cathode material for sodium-ion batteries. It can deliver a reversible capacity of 90.6 mA h g(-1) at a rate as high as 20C. At 5C, 75.0% of the initial specific capacity can be retained after 400 cycles with a capacity-decay rate of 0.07% per cycle, demonstrating a superior long-term cyclability at high current density. X-ray diffraction and absorption characterization revealed reversible phase transformations and electronic structural changes during the Na+ deintercalation/intercalation process. Ni, Co and Fe ions contribute to charge compensation during charge and discharge. Although Ti ions do not contribute to the charge transfer, they play a very important role in stabilizing the structure during charge and discharge by suppressing the Fe migration. In addition, Ti substitution can also smooth the charge-discharge plateaus effectively, which provides a potential advantage for the commercialization of this material for room temperature sodium-ion batteries.
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