Nanocomposite with Improved Lithium Storage

  • Author:
  • Published: 17 December 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Applied Materials & Interfaces/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Nanocomposite with Improved Lithium Storage

TiO2 nanocrystals can be used to store lithium ions, which could make them useful for lithium-ion batteries. However, they have a low electric conductivity, which is a problem when they are used as an electrode in a battery. They also tend to aggregate, which negatively affects their properties. Combining TiO2 nanocrystals with a conductive carbon material could solve these problems. However, existing composite materials are inhomogenous—which reduces their performance—and/or difficult to prepare.

Hai Wang, Guilin University of Technology, China, and colleagues have developed a new TiO2–x@C nanocomposite electrode material for lithium-ion batteries. The team prepared TiO2 nanocrystals from tetrabutyl titanate, using formic acid and anhydrous ethanol to limit crystal growth and sodium dodecylbenzenesulfonate (SDBS) as a surfactant. The resulting nanocrystals were mixed with vitamin C as a carbon source and heated to 200 °C.

The molten vitamin C and the nanocrystals form a solid-liquid mixture, which ensures a uniform distribution of the TiO2 particles in the composite material (schematically pictured). The vitamin C is converted into a porous, three-dimensional carbon matrix, which is closely connected to the nanocrystals by covalent bonds. The process also introduces surface defects in the TiO2 crystals that improve the material's performance as an electrode material.

The structure of the nanocomposite combines the good electrical conductivity of the carbon framework with the useful lithium-ion transport and storage properties of TiO2. The carbon matrix also prevents the aggregation of the nanocrystals. The resulting electrodes have high reversible capacities.



Article Views: 2010

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

CONNECT: on Facebook on Twitter on YouTube on LinkedIn Sign up for our free newsletter

Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH