期刊
ACS APPLIED NANO MATERIALS
卷 1, 期 2, 页码 505-511出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b00045
关键词
porous structure; MXene; high rate; long cycle life; sodium-ion storage
资金
- Commonwealth of Australia through the Automotive Australia 2020 Cooperative Research Centre
- national long-term project of Thousand Talents Plan of Bureau of Foreign Experts Affairs of the People's Republic of China [WQ20152200273]
The development of anode materials remains a challenge to satisfy the requirements of sodium-ion storage for large-scale energy-storage applications, which is ascribed to the low kinetics of ionic/electron transfer of electrode materials. Here we show that the controlled anisotropic assembly of highly conductive Ti3C2Tx MXene nanosheets to form a porous structure can enhance the sodium-ion storage kinetics. At high current densities of 1 and 10 A g(-1), the porous Ti3C2Tx electrode delivered capacities of 166 and 124 mA h g(-1), respectively. Even at an extremely high current density of 100 A g(-1), a capacity of 24 mA h g(-1) could be achieved. The porous Ti3C2Tx electrode also exhibited a long cycle life that can be extended to 1000 cycles with no capacity decay at a current density of 1 A g(-1). This work demonstrates successful control of the Ti3C2Tx architecture to push electrochemical sodium-ion storage closer to large-scale applications and is expected to shed light on the rational utilization of the outstanding properties of MXenes by controlling their microscopic assembly.
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