| 摘要 |
Disclosed are a lithium-ion battery negative electrode material, a preparation method therefor, and a lithium-ion battery, where the technical problem to be solved is to improve for the lithium-ion battery the discharge capacity, discharge rate, and the performance in liquid-absorption and in cycling. The negative electrode material of the present invention is a composite material consisting of graphite substrates, networked carbon nanotubes and/or carbon nanofibers grown in situ on the graphite substrates, and/or networked carbon nanotubes and/or carbon nanofibers mixed between the graphite substrates, and nano-columnar structures. The preparation method of the present invention comprises: adding a catalyst into a graphite substrate material, placing same into a furnace chamber, and introducing a carbon source gas when the temperature reaches between 300°C and 1300°C. Compared with the prior art, the present invention allows for simplified process, precise and accurate control, facilitated reproduction, increased material specific surface area, improved electrical conductivity, an increase between 10 and 30 mAh/g in discharge capacity, and a 10C/1C ratio of = 94%. Employment of the material of the present invention in the preparation of batteries reduces the amount of a conductive agent used and reduces costs for the lithium-ion battery. |
