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Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR

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Abstract

In order to study a diffusive behavior of Li+ in Li intercalated graphites, we have measured muon spin relaxation (μ+SR) spectra for C6Li and C12Li synthesized with an electrochemical reaction between Li and graphite in a Li-ion battery. For both compounds, it was found that Li+ ions start to diffuse above 230 K and the diffusive behavior obeys a thermal activation process. The activation energy (Ea) for C6Li is obtained as 270(5) meV, while Ea = 170(20) meV for C12Li. Assuming a jump diffusion of Li+ in the Li layer of C6Li and C12Li, a self-diffusion coefficient DLi at 310 K was estimated as 7.6(3) × 10−11 (cm2 s−1) in C6Li and 14.6(4) × 10−11 (cm2 s−1) in C12Li.

Graphical abstract: Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR

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Publication details

The article was received on 30 Mar 2017, accepted on 28 Jun 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP02047C
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR

    I. Umegaki, S. Kawauchi, H. Sawada, H. Nozaki, Y. Higuchi, K. Miwa, Y. Kondo, M. Månsson, M. Telling, F. C. Coomer, S. P. Cottrell, T. Sasaki, T. Kobayashi and J. Sugiyama, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP02047C

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