▎ 摘　　要

NOVELTY - Manufacturing composite film comprises (i) preparing silicon nanoparticles (SiNPs)/carbon nanotube (CNT) mixed solution by adding predetermined silicon nanoparticles and carbon nanotube powder to ethanol, stirring the mixture, and sonicating the mixture for a predetermined time; (ii) preparing a SiNPs/CNT/graphene (GO) dispersion by adding aqueous graphene solution to the SiNPs/CNT mixed solution, sonicating the resulting mixture and stirring for a predetermined time; (iii) filtering and drying the SiNPs/CNT/GO dispersion to prepare a SiNPs/CNT/GO composite film; and (iv) preparing a thermally reduced SiNPs/CNT/rGO composite film through a heat treatment process. USE - The composite film is useful as anode material for a lithium ion secondary battery. ADVANTAGE - The composite film has excellent capacity retention and coulombic efficiency; improves the performance of lithium ion batteries; solves problem of volume expansion of silicon by using nano-sized silicon; ensures disadvantages of individual materials were supplemented by combining graphene and carbon nanotubes; prevents the direct contact between the silicon surface and the electrolyte to inhibit addition reaction and solid electrolyte interfacial layer formation; provides a flexible three-dimensional space that alleviates the volume expansion of silicon; and improves cycle efficiency and battery life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing secondary battery comprising (a) preparing thermally reduced SiNPs/CNT/rGO composite film by above method; and (b) manufacturing a secondary battery using the SiNPs/CNT/rGO composite film as an anode material.