Influence of mesoporosity on lithium-ion storage capacity and rate performance of nanostructured TiO 2(B)

Anthony G. Dylla, Jonathan A. Lee, Keith J. Stevenson

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

Here, we present the Li + insertion behavior of mesoporous ordered TiO 2(B) nanoparticles (meso-TiO 2(B)). Using presynthesized 4 nm TiO 2(B) nanoparticles as building blocks and a commercially available ethylene glycol-propylene glycol block copolymer (P123) as a structure-directing agent, we were able to produce mesoporous structures of high-purity TiO 2(B) with nanocrystallinity and mesopore channels ranging from 10 to 20 nm in diameter. We compared the Li + insertion properties of nontemplated TiO 2(B) nanoparticles (nano-TiO 2(B)) to meso-TiO 2(B) via voltammetry and galvanostatic cycling and found significant increases in overall Li + insertion capacity for the latter. While nano-TiO 2(B) and meso-TiO 2(B) both show surface charging (pseudocapacitive) Li + insertion behavior, meso-TiO 2(B) exhibits a higher overall capacity especially at high charge rates. We attribute this effect to higher electrode/electrolyte contact area as well as the improved electron and ion transport in meso-TiO 2(B). In this study, we have demonstrated the influence of both nanostructuring and mesoporosity on Li + insertion behavior by rationally controlling the overall architecture of the TiO 2(B) materials.

Original languageEnglish
Pages (from-to)2897-2903
Number of pages7
JournalLangmuir
Volume28
Issue number5
DOIs
Publication statusPublished - 7 Feb 2012
Externally publishedYes

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