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Ti~3~C~2~ MXene as a High Capacity Electrode Material for Metal (Li, Na, K, Ca) Ion Batteries by Dequan Er; Junwen Li; Michael Naguib; Yury Gogotsi; Vivek B. Shenoy is a Engineering article available to read on EtoBox.

What is Ti~3~C~2~ MXene as a High Capacity Electrode Material for Metal (Li, Na, K, Ca) Ion Batteries about?

Two-dimensional (2-D) materials are capable of handling high rates of charge in batteries since metal ions do not need to diffuse in a 3-D lattice structure. However, graphene, which is the most well-studied 2-D material, is known to have no Li capacity. Here, adsorption of Li, as well as Na, K, and Ca, on Ti 3 C 2 , one representative MXene, is predicted by first-principles density functional calculations. In our study, we observed that these alkali atoms exhibit different adsorption energies depending on the coverage. The adsorption energies of Na, K, and Ca decrease as coverage increases, while Li shows little sensitivity to variance in coverage. This observed relationship between adsorption energies and coverage of alkali ions on Ti 3 C 2 can be explained by their effective ionic radii. A larger effective ionic radius increases interaction between alkali atoms, thus lower coverage is obtained. Our calculated capacities for Li, Na, K, and Ca on Ti 3 C 2 are 447.8, 351.8, 191.8, and 319.8 mAh/g, respectively. Compared to materials currently used in high-rate Li and Na ion battery anodes, MXene shows promise in increasing overall battery performance.

Who reads Ti~3~C~2~ MXene as a High Capacity Electrode Material for Metal (Li, Na, K, Ca) Ion Batteries?

Author

Dequan Er; Junwen Li; Michael Naguib; Yury Gogotsi; Vivek B. Shenoy

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 1944-8244)

Published

2014

Language

EN

Field

Engineering (Physical Sciences)