Copper and Zirconium Codoped O3-Type Sodium Iron and Manganese Oxide as the Cobalt/Nickel-Free High-Capacity and Air-Stable Cathode for Sodium-Ion Batteries
- 14 September 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 13 (38), 45528-45537
- https://doi.org/10.1021/acsami.1c12684
Abstract
Considering the abundance of iron and manganese within the Earth's crust, the cathode O3-NaFe0.5Mn0.5O2 has shown great potential for large-scale energy storage. Following the strategy of introducing specific heteroelements to optimize the structural stability for energy storage, the work has obtained an O3-type Na-Fe(0.4)Mn(0.49)Cu(0.1)Z(r0.01)O(2) that exhibits enhanced electrochemical performance and air stability. It displays an initial reversible capacity of 147.5 mAh g(-1) at 0.1C between 2 and 4.1 V, a capacity retention ratio exceeding 69.6% after 100 cycles at 0.2C, and a discharge capacity of 70.8 mAh g(-1) at a high rate of 5C, which is superior to that of O3-NaFe0.5Mn0.5O2. The codoping of Cu/Zr reserves the layered O3 structure and enlarges the interlayer spacing, promoting the diffusion of Na+. In addition, the structural stability and air stability observed by Cu-doping is well maintained via the incorporation of extra Zr favoring a highly reversible phase conversion process. Thus, this work has demonstrated an efficient strategy for developing cobalt/nickel-free high-capacity and air-stable cathodes for sodium-ion batteries.Keywords
Funding Information
- National Natural Science Foundation of China (21506141, 21606158, 21706171, 21978193, U1710256, U1810204)
- Natural Science Foundation of Shanxi Provincec (20181102005, 20181102019)
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