Carbon/Li4Ti5O12 Composite Spheres Prepared Using Chinese Yam as Carbon Source with Ultrahigh Capacity as Anode Materials for Lithium Ion Batteries

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Abstract
Spinel structured Li4Ti5O12 (LTO) spheres modified with carbon (Carbon/LTO composites) using Chinese yam (CY) as carbon source have been obtained by a hydrothermal method combining with a calcining at 700 °C in N2 atmosphere. The influences of the additions of CY on the morphology, structure, carbon content and also the electrochemical properties of the resulted carbon/LTO composite spheres have been investigated in details. SEM and TEM investigations show that all the composites possess spherical morphology and consist of nanosized Li4Ti5O12 crystals modified with carbon. With the increase of CY additions, the size of Li4Ti5O12 primary crystals decrease gradually, and reach to a turn over point and then the crystal size turn to large ones when the CY content increased further. It has been demonstrated that carbon modification of Li4Ti5O12 with Chinese yam as carbon source could efficiently improve the electrochemical performance of Li4Ti5O12. One of the composite sample named as C/LTO‐10 shows an ultrahigh initial specific capacity of about 211.9 mAh ⋅ g−1 at a current density of 1 C. It shows excellent cycle performance and maintains a specific capacity of 184.5 mAh ⋅ g−1 even after 300 cycles. A specific capacity of 123.5 mAh ⋅ g−1 still could be delivered at a high current density of 30 C, exhibiting also superior rate capability.
Funding Information
  • Double First Class University Construction of Shandong Province
  • Taishan Scholars Advantageous
  • Distinctive Discipline Program of Shandong Province
  • Taishan Scholar Program of Shandong Province (201511029)

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