TiO2 embedded in ultrathin N-doping carbon nanosheets derived from shape-engineered titanium metal-organic frameworks for lithium-ion storage

Juanjuan Song, Can Su, Chao Zhang, Ke Wu, Zongdeng Wu, Xifeng Xia, Wu Lei, Daniel Mandler, Ping Du*, Qingli Hao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The utility of TiO2 as an anode for lithium-ion storage is hindered by low conductivity and sluggish ionic diffusion. Here, the 2D N-doped carbon-wrapped TiO2 (TiO2 @NC) composite with a thickness of 5.5 nm derived from the 2D metal-organic framework was designed. This composite consisting of TiO2 nanoparticles embedded in ultrathin N-doping carbon was used to address the rate and cyclability of Li-ion batteries. The 2D nanosheet morphology obtained from Ti8O8(OH)4(BDC-NH2)6(NH2-MIL-125 (Ti))effectively increases the specific surface area and shortens the electron/ion transport pathway. The chemical bond of Ti-C-O between TiO2 nanocrystals and N-doping carbon further improve conductivity. Due to its unique structure, the produced TiO2 @NC composite shows excellent cyclability with a reversible capacity of 110 mAh g–1 after 2000 cycles at 0.5 A g–1. Furthermore, the 2D TiO2 @NC exhibits outstanding rate performance (71 mAh g–1 at 5 A g–1) compared to bulk TiO2 @NC. This general concept can be extended to the development of metal oxide materials based on insertion mechanisms, such as Nb2O5.

Original languageAmerican English
Article number171615
JournalJournal of Alloys and Compounds
Volume967
DOIs
StatePublished - 10 Dec 2023

Bibliographical note

Funding Information:
The work was supported by the National Natural Science Foundation of China (NSFC) and Israel Science Foundation (ISF) joint scientific research program (No. 52161145503), the program for Science and Technology Innovative Research Team in the Universities of Jiangsu Province, China. J.S. acknowledges the support of the China Scholarship Council. The SEM images of H2N-MIL-125(Ti) 10:0, TiO2 @NC10:0, and TiO2 9:1. XPS spectrum and TGA of TiO2 @NC 9:1. The GCD curves, the Rct value, and equivalent circuit model of NC, TiO2 9:1, and the mixture of NC and TiO2 9:1, respectively. The long cycling performance of TiO2 @NC. The GCD curves and cycling performance of LiFePO4. Fig. S11. Cycling performance of the full cell. Table S1. TiO2-based composites as anode material for LIBs.

Funding Information:
The work was supported by the National Natural Science Foundation of China (NSFC) and Israel Science Foundation (ISF) joint scientific research program (No. 52161145503 ), the program for Science and Technology Innovative Research Team in the Universities of Jiangsu Province, China . J.S. acknowledges the support of the China Scholarship Council .

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Anode
  • Lithium-ion storage batteries
  • N-doping carbon
  • Nanosheets
  • TiO nanocomposite

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