Fabrication of N-doped carbon-coated Li4Ti5−xCoxO12 anode for lithium-ion batteries

• Published in: Solid state ionics Vol. 320; pp. 113 - 117
• Main Authors: Liu, Huaixin, Su, Caina, Li, Xuemei, Guo, Yong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-07-2018
• Subjects: Co2+-ion doping; Li-storage performance; Li4Ti5O12 anode; N-doped carbon; Li-storage performance; Li4Ti5O12 anode; N-doped carbon; Co2+-ion doping
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2018.02.035

In this work, the Co2+-ion doping and N-doped carbon coating are adopted to improve the intrinsic and apparent electronic conductivities of Li4Ti5O12. This co-modified composite is fabricated through a ball-milling process followed by one-step solid-state reaction. XRD results demonstrate that the doped Co2+ does not destroy the spinel-type structure and it has successfully doped into the crystal structure of Li4Ti5O12. TEM images reveal that the surface of Li4Ti5-xCoxO12 particle is coated by a thin N-doped carbon layer with a thickness of 3–4 nm. Benefiting from the improved conductivity, the obtained composite displays an excellent rate capability and a stable cyclic property. Thus, the Co2+-ion doped and N-doped carbon-coated Li4Ti5O12 anode has great potential for the application of lithium-ion batteries.
•The Co2+-ion doping and N-doped carbon coating are adopted to improve the Li-storage performance of Li4Ti5O12.•N-doped carbon-coated Li4Ti5-xCoxO12 sample has been prepared by a solid-state reaction.•The obtained composite shows excellent rate capability and stable cyclic life.