Enhancement of the reversible capacity and cycling stability of sodium cathode materials by Li+ reversible migration

Literature Information

Publication Date 2023-12-19
DOI 10.1039/D3TA07304A
Impact Factor 12.732
Authors

Ruguang Ma, Jifen Wang


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Abstract

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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Journal of Materials Chemistry A

Journal of Materials Chemistry A
CiteScore: 19.5
Self-citation Rate: 4.7%
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