The invention discloses a
sulfur-doped MXene negative
electrode material, and a preparation method thereof. The preparation method comprises the following steps: (1) respectively placing a
sulfur precursor material and MXene at two sides in a
quartz boat, and then transferring the
quartz boat into a
tube furnace, with the
mass ratio of the
sulfur precursor material to the MXene being (15-25):1, wherein one side, in which the sulfur precursor material is placed, of the
quartz boat is positioned at the upstream of the
tube furnace; and (2) introducing a protective gas, carrying out a heat treatment reaction, and conducting cooling to
room temperature, washing, and out
vacuum drying to obtain the sulfur-doped MXene negative
electrode material, wherein the heat treatment reaction is as below:increasing the temperature from
room temperature to 170-600 DEG C, conducting insulation for 1.5 h-2.5 h, reducing the temperature to 80-120 DEG C, and conducting insulation for 1.5-2.5h. The preparedsulfur-doped MXene negative
electrode material is large in specific surface area, shows good electrical
conductivity, improves the specific capacity and
cyclic stability of a
potassium ion battery, and has controllable sulfur element
doping amount, and is suitable for large-scale application.