Two-dimensional assemblies of ultrathin titanate nanosheets for lithium ion battery anodes

Seung-Ho Yu, Mihyun Park, Hyun Sik Kim, Aihua Jin, Mohammadreza Shokouhimehr, Tae Young Ahn, Young Woon Kim, Taeghwan Hyeon, Yung Eun Sung

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Abstract

Ultrathin titanate nanosheets of 0.5 nm thickness were successfully synthesized from the non-hydrolytic sol-gel reaction of tetraoctadecyl orthotitanate via a heat-up method. The synthesized nanosheets were easily assembled to be layer structures by being reacted with hydroxide ions in basic solutions such as LiOH, NaOH, and KOH. The hydrophobic surface of the titanate nanosheets was also modified to be a hydrophilic surface through an assembly process. The layer structured nanosheets were employed as anode materials for lithium ion batteries to visualize fast charging and discharging effects utilizing 2D structured electrodes, and stable cycling induced the mechanically stable layered structure. The ultrathin morphology of the 2D titanate electrodes affected not only the diffusion path of Li ions but also the reaction mechanism from the insertion reaction of the crystal interior to the surface reaction. Furthermore, the electrodes of the layer structured nanosheets had superior cycling and rate performances.

Original languageEnglish
Pages (from-to)12087-12093
Number of pages7
JournalRSC Advances
Volume4
Issue number24
DOIs
Publication statusPublished - 2014 Mar 11
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Yu, S-H., Park, M., Kim, H. S., Jin, A., Shokouhimehr, M., Ahn, T. Y., Kim, Y. W., Hyeon, T., & Sung, Y. E. (2014). Two-dimensional assemblies of ultrathin titanate nanosheets for lithium ion battery anodes. RSC Advances, 4(24), 12087-12093. https://doi.org/10.1039/c4ra00624k