Anion-controlled synthesis of TiO2 nano-aggregates for Li ion battery electrodes

Hee Jo Song, Jae Chan Kim, Hee Suk Roh, Chan Woo Lee, Sangbaek Park, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Nano-sized anatase TiO2 was synthesized using surfactant-free hydrolysis method by controlling the ratio of anions in solution. The particle sizes of TiO2 were systematically tuned by the molar ratio of the Ti4 + precursors (chlorides and sulfates). Each TiO2 particle consists of an aggregation of 5 nm primary crystallites, resulting in a large specific surface area. TiO2 nano-aggregates (TiO2 NAs) which were 50 nm in size exhibited the best cycle stability. After calcination, the capacity of the TiO2 NA was enhanced to 171 mAh g- 1 at 100 cycles at a rate of 0.2 C due to the removal of impediments such as a hydroxyl group and physisorbed water, indicating that more than 0.5 Li was inserted into TiO2 at 100 cycles, and that these NAs had good rate capability at high current densities.

Original languageEnglish
Pages (from-to)13-20
Number of pages8
JournalMaterials Characterization
Volume96
DOIs
Publication statusPublished - 2014 Oct

Bibliographical note

Funding Information:
This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Korean Ministry of Education, Science and Technology ( 2013-052268 ), and the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning ( 2012R1A2A2A01045382 and 2010-0029027 ). The characterization of the materials was supported by the Research Institute of Advanced Materials (RIAM) .

Keywords

  • Anion change
  • Hydrolysis
  • Lithium-ion batteries
  • Nano-aggregates

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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