Affiliation:
1. School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055 China
2. Department of Chemistry Materials and Chemical Engineering Politecnico di Milano Via Luigi Mancinelli, 7 Milano 20131 Italy
3. Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China
4. Spallation Neutron Source Science Centre (CSNS) Dongguan 523803 China
Abstract
AbstractLayered transition metal oxides are promising cathode materials for sodium‐ion batteries due to their high energy density and appropriate operating potential. However, the poor structural stability is a major drawback to their widespread application. To address this issue, B3+ is successfully introduced into the tetrahedral site of Na0.67Fe0.5Mn0.5O2, demonstrating the effectiveness of small‐radius ion doping in improving electrochemical performance. The obtained Na0.67Fe0.5Mn0.5B0.04O2 exhibits excellent cycling performance with 88.8% capacity retention after 100 cycles at 1 C and prominent rate performance. The structure‐property relationship is constructed subsequently by neutron powder diffraction, in situ X‐ray diffraction and X‐ray absorption spectroscopy, which reveal that the Jahn–Teller distortion and the consequent P2‐P2' phase transformation are effectively mitigated because of the occupancy of B3+ at the interstitial site. Furthermore, it is found that the transition metal layers are stabilized and the transition metal dissolution are suppressed, resulting in excellent cycling performance. Besides, the prominent rate performance is attributed to the enhanced diffusion kinetics associated with the rearrangement of Na+. This work provides novel insight into the action mechanism of interstitial site doping and demonstrates a universal approach to improve the electrochemical properties of P2‐type manganese‐based sodium cathode materials.
Funder
Shenzhen Fundamental Research Program
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
5 articles.
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