▎ 摘　　要

NOVELTY - The cathode of lithium-ion battery has a carbon fiber film (50) comprising a carbon nanotube film comprising multiple carbon nanotubes (56) joined end to end and extending along a same direction. Each of the multiple carbon nanotubes is joined with multiple graphene sheets (58). An angle is defined between each of the multiple graphene sheets and the multiple carbon nanotubes. An outside wall of each of multiple carbon nanotubes is joined with the multiple graphene sheets by a covalent bond. USE - Cathode of lithium-ion battery. Can also be used in portable devices, such as, notebook PC, mobile phone and digital camera. ADVANTAGE - An anode of a lithium battery has properties of high energy density, low open-circuit voltage versus metallic lithium electrodes, high capacity retention, good performance in common electrolytes, high density, good stability during charge and discharge processes and low cost. The free-standing carbon nanotube film sustains the weight of itself when it is hoisted by a portion without any significant damage to its structural integrity. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a carbon fiber film of the cathode of lithium-ion battery. Carbon fiber film (50) Carbon fibers (54) Carbon nanotubes (56) Graphene sheets (58)