Insights into the Li+ storage mechanism of TiC@C-TiO2 core-shell nanostructures as high performance anodes

Cao, Songjie1; Xue, Zhe1; Yang, Chengwu1; Qin, Jiaqian2,3; Zhang, Long1; Yu, Pengfei1; Wang, Shanmin4; Zhao, Yusheng4; Zhang, Xinyu1; Liu, Riping1

2018-08

10.1016/j.nanoen.2018.05.022

Nano Energy   影响因子和分区

2211-2855

2211-3282

Titanium carbide @ carbon-doped titanium dioxide (TiC@C-TiO2) core-shell nanostructures are designed, prepared and demonstrated for the application in lithium ion battery anode. Synthesis of these specific core-shell nanostructures is achieved via a facile, novel, and one-pot approach using oxidative growth of C-TiO2 onto TiC nanoparticles, which has a higher electrochemical activity than those of pure P25 and TiC nanoparticles. The core-shell nanostructured anodes exhibit a high lithium storage capacity (352.8 mAh g(-1) at 100 mA g(-1)), good rate capability (253.6 mAh g(-1) at 1 A g(-1), 158.1 mAh g(-1) at 10 A g(-1)), and outstanding cycle stability in lithium ion batteries (LIBs) (similar to 150 mAh g(-1) at 10 A g(-1) after 400 cycles), which is about 48 times and 7 times higher than that of TiO2 electrode (similar to 3.3 mAh g(-1) at 10 A g(-1)) and TiC (similar to 25 mAh g(-1) at 10 A g(-1)). According to the first-principle calculation, the ultrahigh capacity and cycle stability of the as-prepared anode is ascribed to the enhancement of Li+ absorption and diffusion ability through formation of C-TiO2 porous layer onto the conductive TiC particles. Moreover, the increase of electron density around the Fermi level is found to be mainly caused by the core-shell nanostructures. The results demonstrate that the presence of TiC plays an important role in providing high conductivity and the novel core-shell nanostructure can buffer the huge volume expansion and contraction during prolonged cycling, resulting in great potential applications in LIBs.

Lithium-ion battery anode Core-shell nanostructure Titanium dioxide Titanium carbide First-principle calculation

SCI ; EI

英语

其他

Chulalongkorn University[GB_B_60_114_62_03]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000438076200004

ELSEVIER SCIENCE BV

20182005204990

Anodes ; Ions ; Lithium-ion batteries ; Nanoparticles ; Oxides ; Shells (structures) ; Synthesis (chemical) ; Titanium carbide ; Titanium dioxide

Structural Members and Shapes:408.2 ; Electron Tubes:714.1 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Solid State Physics:933

Web of Science

1.Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
2.Chulalongkorn Univ, Met & Mat Sci Res Inst, Bangkok 10330, Thailand
3.Chulalongkorn Univ, Res Unit Adv Mat Energy Storage, Bangkok, Thailand
4.Southern Univ Sci Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

Cao, Songjie,Xue, Zhe,Yang, Chengwu,et al. Insights into the Li+ storage mechanism of TiC@C-TiO2 core-shell nanostructures as high performance anodes[J]. Nano Energy,2018,50:25-34.

Cao, Songjie.,Xue, Zhe.,Yang, Chengwu.,Qin, Jiaqian.,Zhang, Long.,...&Liu, Riping.(2018).Insights into the Li+ storage mechanism of TiC@C-TiO2 core-shell nanostructures as high performance anodes.Nano Energy,50,25-34.

Cao, Songjie,et al."Insights into the Li+ storage mechanism of TiC@C-TiO2 core-shell nanostructures as high performance anodes".Nano Energy 50(2018):25-34.