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MXene electrode material performance in magnesium batteries
The two-dimensional Ti3C2Tx MXene material has attracted attention due to its excellent electrical conductivity and high volume capacity in supercapacitors, lithium ion batteries, and sodium ion batteries. Magnesium ion batteries have become one of the most promising alternatives to lithium-ion batteries due to their low cost, good safety performance, and large theoretical energy density. The theory predicts that pure Ti3C2 has strong Mg2+ storage performance. However, so far, it has not been possible to synthesize MXene without surface functional groups. Studies have shown that divalent magnesium ions cannot be reversibly embedded in Ti3C2Tx, resulting in almost no magnesium storage capacity for Ti3C2Tx MXene. Therefore, it is necessary to explore suitable experimental methods to open the magnesium ion storage performance of MXene.
Recently, the research team of Lanzhou Institute of Chemical Physics, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, used the pre-inserted cationic surfactant cetyltrimethylammonium bromide (CTAB) method to change the electronic properties of MXene, so that Ti3C2Tx MXene exhibited higher magnesium content. Ion storage capacity. The researchers systematically tested the samples: the anionic surfactant sodium dodecylsulfate SDS and the cationic surfactant with the same alkyl chain length dodecyl trimethylammonium bromide DTAB were compared and tested and showed that the surface activity The agents will increase the interlayer spacing of MXene, but only the cationic surfactant promotes the storage of Mg2+ in MXene. XPS and density functional theory calculations show that the embedded CTA+ cations reduce the diffusion barrier of Mg2+ on the MXene surface, which in turn greatly enhances the reversible intercalation/desorption performance of Mg2+ in the MXene layer. Studies have shown that a magnesium battery with MXene as a positive electrode exhibits a high volumetric capacity of 300 mAh·cm-3 and excellent rate characteristics at a current density of 50 mA·g-1. This study has given MXene material another new application in the field of electrochemical energy storage, but also provides a new choice for the cathode material of magnesium batteries.
The results of this study were recently published online at ACS Nano.
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