Dalian Institute of Materials Two-dimensional metal carbide-based energy storage materials made new progress

Recently, Wu Zhongshuai, a researcher of the two-dimensional material and energy device research group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, successfully prepared an alkalized MXene nanometer with an increased separation distance by oscillating a two-dimensional metal carbide nanosheet (MXene) in a KOH solution. The tape was found to have excellent sodium storage and potassium storage properties. Relevant research results were published in the journal Nano Energy (DOI: 10.1016/j.nanoen.2017.08.002).

MXene is a new type of two-dimensional metal carbon (nitrogen) nanosheets. The common Ti3C2 MXene sheet has been proved to be an advanced energy storage electrode material. However, the conventional MXene material prepared by hydrofluoric acid etching has serious layer stacking. The interlayer spacing is small, and the electrode material has low specific capacity and poor cycle performance. Therefore, there is an urgent need to develop new MXene-based energy storage materials with stable structure and performance.

The research team developed a new strategy for oscillating Ti3C2 MXene with a KOH solution. The one-step approach was to achieve the preparation of alkalized Ti3C2 MXene nanobelts (a-Ti3C2 MNRs). The a-Ti3C2 MNRs have a large interlayer spacing (12.5Ã…). The narrow width (6-22nm), ultra-thin thickness, and open network structure have well-developed ion and electron fast transmission channels, which significantly improves the stability of the electrode structure. It was found that a-Ti3C2 MNRs can be used as anode material for high-capacity sodium-ion battery (SIBs) and potassium-ion battery (PIBs). The reversible capacity of SIBs and PIBs is 168mAh/g and 136mAh at a current density of 20mA/g. /g; When the current density is increased to 200mA/g, the reversible capacity is 84mAh/g and 78mAh/g respectively; meanwhile, both SIBs and PIBs exhibit good cycle stability, and they are cycled at a high current density of 200mA/g. Afterwards, the reversible capacity can still be maintained at 50 mAh/g and 42 mAh/g, respectively, superior to most reported MXene-based electrode materials. This method is expected to be extended to the construction of other three-dimensional MXene structures, and to broaden the application of MXene materials.

The above work has been funded by the National Key R&D Program, the National Natural Science Foundation, the National Youth Talents Program, the Natural Science Foundation of Liaoning Province, and the China Postdoctoral Fund.

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