The invention provides a Cu9S5@C
nanocomposite material used for the negative
electrode of a battery and a preparation method thereof. The preparation method comprises the following steps: with
sulfur powder,
copper acetate and
ammonia water as reaction raw materials, carrying out a hydrothermal method so as to generate
copper sulfide, carrying out annealing so as to obtain Cu9S5,
coating glucose on the surface of Cu9S5 by utilizing the hydrothermal method, and carrying out annealing at a high temperature so as to obtain the Cu9S5@C
nanocomposite material. According to the invention, carbon is coated on the surface of
metal sulfide, so the disadvantages of poor cycle performance and stability of
sulfide can be effectively compensated; cycle performance and stability of a material are improved;
conductivity of the material can be increased; and the Cu9S5@C
nanocomposite material used as an
anode material of a
lithium ion battery can effectively realize high capacity and good cycle stability and effectively improves performances of the battery. Testing results show that the
lithium ion battery with the Cu9S5@C nanocomposite material prepared by using the preparation method provided by the invention as the negative
electrode has good
lithium-
ion electric performance, stable specific capacity and good cycle performance, obtains the characteristic of fast-rising capacity after manifold cycles, and has the specific capacity increased to two times of the initial specific capacity after 90 cycles.