锂空气电池因具有超高的理论能量密度而受到人们的广泛关注,但是锂空气电池正极的不稳定性和低催化活性限制了其广泛应用。用氯化铵和硫脲分别作氮源和硫源,成功合成了氮硫共掺杂MXene(N,S/MXene)材料。结果表明,该材料具有增大的层间距和丰富的反应活性位点,当以N,S/MXene作锂空气电池正极时,在500 mA/g的电流密度、600 mAh/g的限定容量下,实现了150圈的稳定循环,显示出了优异的电化学性能。

Lithium-air batteries have attracted much attention due to their ultra-high theoretical energy densities.However,the instability and low catalytic activity of cathodes currently limit their widespread application.Herein nitrogen and sulfur co-doped MXene (N,S/MXene) material is successfully synthesized by using ammonium chloride and thiourea as N and S sources,respectively.It is indicated that the prepared N,S/MXene material possesses an increased layer spacing and abundant reactive sites.As N,S/MXene is used as the cathode for Li-air batteries,it achieves a stable cycle stability up to 150 cycles at a current density of 500 mA·g^-1 and a limited capacity of 600 mAh·g^-1,showing excellent electrochemical performance.

李浩(1996-),男,硕士生,研究方向为新能源电池材料,760430845@qq.com。