Journal
NANOSCALE
Volume 13, Issue 15, Pages 7355-7361Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr06260j
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Funding
- National Natural Science Foundation of China [21671167, 51602277]
- Hunan Provincial Innovation Foundation For Postgraduate [CX2018B815]
- Innovation and Entrepreneurship Training Plan for College Students in Jiangsu Province
- Shaoyang University Innovation Foundation For Postgraduate [CX2018SY025]
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Li-ion batteries are in demand for high energy storage devices, with MAX phase compounds showing promise as electrode materials. Ti2SnC nanosheets exhibit reversible electrochemical intercalation of Li+, demonstrating increased specific capacity with cycling. This research indicates a novel strategy for further intercalation and delamination of MAX phases.
Li-ion batteries attract great attention due to the rapidly increasing and urgent demand for high energy storage devices. MAX phase compounds, layered ternary transition metal carbides and/or nitrides show promise as candidate materials of electrodes for Li-ion batteries. However, the highest specific capacity reported up to now is relatively low (180 mA h g(-1)), preventing them from use in real applications. Exploring more MAX phase compounds with delaminated two-dimensional structure is an effective solution to increase the specific capacity. Herein, we report the reversible electrochemical intercalation of Li+ into Ti2SnC (MAX phase) nanosheets. Owing to the synergistic effects of intercalation and dimethyl sulfoxide (DMSO)-assisted exfoliation, Ti2SnC nanosheets are successfully obtained via sonication in DMSO. Moreover, when using as an anode of a Li-ion battery, Ti2SnC nanosheets exhibited an increasing specific capacity with cycling due to the exfoliation of Ti2SnC nanosheets via reversible Li-ion intercalation. After 1000 charge-discharge cycles, Ti2SnC nanosheets delivered a high specific capacity of 735 mA h g(-1) at a current density of 50 mA g(-1), which is far better than other MAX phases, such as Ti2SC, Ti3SiC2 and Nb2SnC. The current work demonstrates the Li-ion storage potential and indicates a novel strategy for further intercalation and delamination of MAX phases.
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