Simple size control of TiO 2 nanoparticles and their electrochemical performance: Emphasizing the contribution of the surface area to lithium storage at high-rates

Joohyun Lim, Ji Hyun Um, Kyung Jae Lee, Seung-Ho Yu, Young Jae Kim, Yung Eun Sung, Jin Kyu Lee

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The particle size effects of TiO 2 nanoparticles (TNPs), which are composed of small crystallites, on Li ion storage are a very fundamental and important subject. However, size control of TNPs under 200 nm using a sol-gel method has been limited due to the highly reactive precursor, titanium alkoxide. In this study, TNPs with various sizes even under 100 nm are obtained by controlling the reactant concentrations in a mixed solvent of ethanol and acetonitrile. Among them, three different sizes of TNPs are prepared to compare the Li ion storage capacity, and 60 nm TNPs are found to have the best reversible capacity of 182 mA h g -1 after 50 cycles at 1 C and a remarkable rate performance of 120 mA h g -1 at 10 C. Capacity increase upon cycling is observed in the size-controlled TNPs, and the explanation of this phenomenon is proposed to the lattice volume expansion of TiO 2 upon intercalation for enabling further penetration of the electrolyte into the particles' interior. Moreover, the capacity at high rates is more closely related to the surface area from Hg porosimetry analysis than from typical N 2 adsorption/desorption analysis.

Original languageEnglish
Pages (from-to)5688-5695
Number of pages8
JournalNanoscale
Volume8
Issue number10
DOIs
Publication statusPublished - 2016 Mar 14
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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