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

文献情報

出版日 2023-12-19

DOI 10.1039/D3TA07304A

インパクトファクター 12.732

著者

Ruguang Ma, Jifen Wang

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要旨

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.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

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