期刊
CHEMICAL SCIENCE
卷 12, 期 3, 页码 1062-1067出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc05427e
关键词
-
资金
- National Natural Science Foundation of China [21835004, 21822506, 51761165025]
- Tianjin Natural Science Foundation [19JCJQJC62400]
- 111 project [B12015]
Introducing lithium ions to partially substitute manganese ions in layered manganese-based oxides leads to a distorted structure which enhances the performance of cathode materials in sodium-ion batteries. This strategy improves specific capacity, cycling stability, and rate capability in SIBs.
Layered manganese-based oxides are promising candidates as cathode materials for sodium-ion batteries (SIBs) due to their low cost and high specific capacity. However, the Jahn-Teller distortion from high-spin Mn3+ induces detrimental lattice strain and severe structural degradation during sodiation and desodiation. Herein, lithium is introduced to partially substitute manganese ions to form distorted P ' 2-Na0.67Li0.05Mn0.95O2, which leads to restrained anisotropic change of Mn-O bond lengths and reinforced bond strength in the [MnO6] octahedra by mitigation of Jahn-Teller distortion and contraction of MnO2 layers. This ensures the structural stability during charge and discharge of P ' 2-Na0.67Li0.05Mn0.95O2 and Na+/vacancy disordering for facile Na+ diffusion in the Na layers with a low activation energy barrier of similar to 0.53 eV. It exhibits a high specific capacity of 192.2 mA h g(-1), good cycling stability (90.3% capacity retention after 100 cycles) and superior rate capability (118.5 mA h g(-1) at 1.0 A g(-1)), as well as smooth charge/discharge profiles. This strategy is effective to tune the crystal structure of layered oxide cathodes for SIBs with high performance.
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