Preparation and property of NbTe2/MXene superstructure anode for potassium ion battery
The relatively large size of potassium ions can lead to slow diffusion kinetics and accompany dramatic volume changes for anodes during the charge-discharge process of potassium-ion battery.In order to solve these problems,NbTe2/MXene with three-dimensional superstructure is prepared through NbTe2 nanoneedles vertically growing on MXene nanosheets,which exhibits excellent cycling stability and rate performance.After it has been circled over 150 cycles at a current density of 0.2 A·g-1,its reversible specific capacity still reaches 306.8 mAh·g-1 with a capacity retention of 68.4%and an average capacity loss of only0.21%per cycle.Even at a high current density of 20 A·g-1,it still achieves a reversible capacity of 139.8 mAh·g-1.This superstructure possesses numerous advantages such as a large specific surface area,good electronic conductivity,and multiple active sites,which can improve the performance of potassium ion batteries and provide valuable references for the development of high-performance anode materials.
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