Hairy graphite of high electrochemical performances prepared through in-situ decoration of carbon nanotubes

- Hairy graphite is prepared by in-situ growth of carbon nanotubes on the graphite surface.
- The hairy pattern of geometry improves the mechanics and conductivity of the electrode.
- Superb rate performance and prolonged cycle life of the graphite anode are obtained.
- Physical integrity explains the improved electrochemical performance of the electrode.

A hairy graphite is synthesized through a modified chemical vapor deposition (CVD) method, in which 2,3-dipicolinic acid and Ni(NO3)2 are employed as the carbon source and the catalyst precursor, respectively. Under Ar/H2 (95:5) reducing atmosphere at 900 °C, Ni(NO3)2 is reduced to nickel nanoparticles and 2,3-dipicolinic acid is pyrolyzed into carbon fragments. With the catalysis of nickel nanoparticles, carbon nanotubes (CNTs) are in-situ grown on the graphite surface through realignment of the carbon fragments. The hairy pattern of geometry of the graphite@CNT composite not only improves the mechanics and conductivity of the electrode, but also has more room to accommodate the volume change of the graphite particle upon prolonged electrochemical cycles. A superb rate performance and prolonged cycle life are obtained. The simple and effective strategy for integration of graphite with in-situ grown CNTs is very useful for boosting its electrochemical properties.

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