Detailed investigation of Na2.24FePO4CO3 as a cathode material for Na-ion batteries
- Huang, Weifeng
- Zhou, Jing
- Li, Biao
- Ma, Jin
- Tao, Shi
- Xia, Dingguo
- Chu, Wangsheng
- Wu, Ziyu
DOIAbstract
Na-ion batteries are gaining an increased recognition as the next generation low cost energy storage devices. Here, we present a characterization of Na3FePO4CO3 nanoplates as a novel cathode material for sodium ion batteries. First-principles calculations reveal that there are two paths for Na ion migration along b and c axis. In-situ and ex-situ Fe K-edge X-ray absorption near edge structure (XANES) point out that in Na3FePO4CO3 both Fe2+/Fe3+ and Fe3+/Fe4+ redox couples are electrochemically active, suggesting also the existence of a two-electron intercalation reaction. Ex-situ X-ray powder diffraction data demonstrates that the crystalline structure of Na3FePO4CO3 remains stable during the charging/discharging process within the range 2....
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