MoSe_(2)@氮掺杂的分层多孔碳复合材料应用于钠离子电池

MoSe_(2)@NHPC composites for Na-ion batteries

高理论容量和宽层间距的MoSe_(2)材料是很有前途的钠离子电池(SIBs)负极材料.然而,MoSe_(2)在储能方面(数百次循环后)存在体积膨胀、结构稳定性差等问题.因此,设计了一种MoSe_(2)@氮掺杂的分层多孔碳(NHPC)复合材料,该复合材料中的NHPC不仅可以提高材料的导电性,还能够缓解MoSe_(2)的体积膨胀甚至坍塌.通过电化学测试,在50mA/g电流密度下,MoSe_(2)@NHPC复合材料放电容量为535.4mA􀅰h/g,在200mA/g电流密度下,经过100圈的充放电循环后,容量可达142.8mA􀅰h/g.为钠离子电池的负极材料提供新的见解.

MoSe_(2)materials with high theoretical capacity and wide layer spacing are promising anode materials for sodium-ion batteries(SIBs).However,MoSe_(2)suffers from volume expansion and poor structural stability in terms of energy storage(after hundreds of cycles).Therefore,a MoSe_(2)@NHPC composite was designed,in which the NHPC material can not only improve the electrical conductivity of the material,but also alleviate the volume expansion and even collapse of MoSe_(2).This is proved by electrochemical tests.At a current density of 50 mA/g,the MoSe_(2)@NHPC composite has a discharge capacity of 535.4 mA·h/g.At a current density of 200 mA/g,the capacity can reach 142.8 mA·h/g after 100 charge-discharge cycles.This study could provide new insights into anode materials for sodium-ion batteries.