Enhancement of the reversible capacity and cycling stability of sodium cathode materials by Li+ reversible migration
Literature Information
Ruguang Ma, Jifen Wang
Sodium-ion batteries, because of their sustainability and low cost, provide an attractive alternative to Li-ion technology for large-scale energy storage. However, their applicability still faces a large challenge due to the lack of high energy density and cycling-stable Na-based positive materials. Here, we design and synthesize a P2-type Na0.7Li0.1Mg0.2Mn0.7O2 material exhibiting synergistic anionic and cationic redox activity. This material exhibits a high reversible capacity of 217 mA h g−1 which is attributed to Mn3+ − e− = Mn4+ and O2− − ne− = O(2−n)− demonstrated by combined spectrum and DFT calculations. Not only high energy density, NLMMO also exhibits high cycling stability with a reversible capacity of 183 mA h g−1 (84.3%) for 50 cycles. These findings, rationalized by DFT calculations, reveal the effect of interlayer Li+ migration on regulating structural stability, achieving a high reversible capacity. The present study offers a new strategy for designing high-performance cathode materials with synergistic anionic and cationic redox reactions.
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DOI: 10.1039/A705097F
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Journal of Materials Chemistry A

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment











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