N-doped carbon coated anatase TiO2 nanoparticles as superior Na-ion battery anodes

Jin Wang; Guiyu Liu; Kaili Fan; Dan Zhao; Beibei Liu; Jianbo Jiang; Dong Qian; Chunming Yang; Junhua Li

doi:10.1016/j.jcis.2018.02.001

N-doped carbon coated anatase TiO₂ nanoparticles as superior Na-ion battery anodes

J Colloid Interface Sci. 2018 May 1:517:134-143. doi: 10.1016/j.jcis.2018.02.001. Epub 2018 Feb 2.

Authors

Jin Wang¹, Guiyu Liu¹, Kaili Fan¹, Dan Zhao¹, Beibei Liu¹, Jianbo Jiang², Dong Qian³, Chunming Yang⁴, Junhua Li⁵

Affiliations

¹ Hunan Provincial Key Laboratory of Chemical Power Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China.
² College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, PR China.
³ Hunan Provincial Key Laboratory of Chemical Power Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China. Electronic address: qiandong6@vip.sina.com.
⁴ College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China.
⁵ Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, PR China. Electronic address: junhua325@126.com.

PMID: 29421673
DOI: 10.1016/j.jcis.2018.02.001

Abstract

N-doped carbon coated TiO₂ nanoparticles (TiO₂@NC) were synthesized through a simple two-step route, in which dopamine was simultaneously utilized as both nitrogen and carbon sources. With TiO₂@NC applied in the Na-ion battery (SIB) anodes, the continuous and uniform N-doped carbon layer can not only enhance the electrical conductivity of TiO₂ and facilitate the surface pseudocapacitive process, but also serve as a buffer layer to accommodate the volume expansion during the sodiation-desodiation processes. The as-prepared TiO₂@NC exhibits excellent electrochemical performance when utilized as the SIB anodes, which delivers a remarkably high reversible capacity of 250.2 mAh g^-1 at a rate of 0.25C (84 mA g^-1) after 200 cycles and still retains 122.1 mAh g^-1 at 10C (3.35 A g^-1) even after 3000 cycles accompanied with a 95.3% retention of the maximum capacity, outperforming most of the reported TiO₂/C-based composites as SIB anodes. To our best knowledge, the preparation of TiO₂@NC with dopamine as both nitrogen and carbon sources and its application in the SIB anodes are reported for the first time.

Keywords: Coated; Dopamine; N-doped carbon layer; Sodium ion battery; TiO(2).