Titania and nitrogen-doped carbon co-modification: Their synergic effects on the electrochemical performance of LiFePO4

Jiayuan SHI, Xiaoqing ZHANG, Xiaokun ZHANG, Yong XIANG*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

18 Citations (Scopus)

Abstract

TiO2 and N-doped carbon co-modified LiFePO4 composites (LFP-TiO2-C-N) have been successfully synthesized by using tetrabutyl titanate (TBOT) and dopamine (DPA) as titanium and N-doped carbon sources, respectively. The LiFePO4 modification is performed by dopamine polymerization in the alkaline environment supplied by the TBOT hydrolyzation process. The resulting LFP-TiO2-C-N materials are characterized by EDS, XPS, TG, ICP and HRTEM to confirm the close adhesion of TiO2 nanoparticles and N-doped carbon layers on the LiFePO4 surfaces. The charge–discharge tests demonstrate that the LFP-TiO2-C-N composites deliver a superior initial capacity of 165.3 mAh·g−1 at 0.1 C and high rate performance with discharge capacities of 145 mAh·g−1 at 1 C and 124 mAh·g−1 at 2 C. The LFP-TiO2-C-N composites can retain 99.4% of the initial capacity after 50 cycles at 1 C, revealing a stable cycling stability. Therefore, the synergistic growth of TiO2 and N-doped carbon on the LFP surface could result in the synergic improvement in the electrochemical performance of cathode.

Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalJournal of Alloys and Compounds
Volume750
Early online date20 Feb 2018
DOIs
Publication statusPublished - 25 Jun 2018
Externally publishedYes

Bibliographical note

J. Shi and X. Zhang acknowledge financial support from China Postdoctoral Science Foundation (Contract No. 2017M612938 and 2016M602667). This work is also supported by the National Science Funds of China (Contract No. 51472044), and Program for New Century Excellent Talents in University (Contract No. NCET-12-0098).

Keywords

  • Co-modification
  • LiFePO
  • Lithium-ion battery
  • Nitrogen-doped carbon
  • Titania

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