Preparation method for negative electrode material of lithium ion battery

The invention discloses a preparation method for a negative electrode material of a lithium ion battery. The preparation method comprises: performing acidizing treatment, centrifuging and water-washing on CNFs to disperse the CNFs in water; mixing the dispersed CNFs with a dispersed aniline and lauryl sodium sulfate aqueous solution; performing ultrasonic treatment to form a stable and uniform mixed solution; stirring ice water and adding acidized ammonium persulfate; performing centrifuging and water-washing on an obtained dispersed solution to obtain CNFs@PANI; adding Na2MoO4 and Na2S; stopping heating and naturally cooling and stirring to obtain CNFs@PANI/MoS3; and then performing calcination and carbonization at a high temperature to finally obtain CNFs@PANI/MoS2. According to the method, volume expansion caused by an internal aspect of ground molybdenum disulfide can be effectively prevented by utilizing polyaniline of in-situ growth, so that the stability of a composite negative electrode material is hi