Journal
NANO ENERGY
Volume 88, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106206
Keywords
Sodium-ion battery; Fe-and Mn-based layered oxide cathodes; Co-substitution strategy; Solid-solution reaction; Lattice strain
Categories
Funding
- National Key Research and Development Program of China [2020YFA0406203]
- National Natural Science Foundation of China [52072008, U2032167]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515012060, 2019B1515120028]
- Clean Vehicles, US-China Clean Energy Research Centre (CERC-CVC2) under US DOE EERE Vehicle Technologies Office
- U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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This study demonstrates an efficient strategy of improving the structural durability of iron- and manganese-based cathodes through dual heteroatom doping, resulting in cathode materials with excellent cyclability and rate capability for grid-scale energy storage systems.
Sodium-ion batteries (SIBs) with iron- and manganese-based cathode electrodes have exhibited great promise in the grid-scale energy storage systems, on the basis of the satisfactory theoretical capacity, as well as huge abundance, low price and non-toxicity of raw materials. However, the inferior cycle life of cathode materials originating from their poor structural stability remains a formidable challenge towards practical applications. Here, an efficient strategy of improving the structure durability is demonstrated in iron- and manganese-based cathodes by dual heteroatom doping. The as-obtained P2-type Na0.65Li0.08Cu0.08Fe0.24Mn0.6O2 cathode delivers superior cyclability (88.2% capacity retention for 500 cycles at 2C), fabulous rate capability (76% capacity retention at 5C compared to 0.1C), and a useable reversible capacity of around 85 mAh g-1 at 0.1C. Through indepth characterizations, the underlying structure-property relationship is established, revealing that the complete solid-solution reaction during cycling ensures the ultralow volume variation (as small as 0.7%) and excellent electrochemical performance. These results highlight the significance of fabricating a stable host for the design and development of advanced SIBs with long life.
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