Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR. Issue 29 (12th July 2017)

• Record Type: Journal Article
• Authors: Umegaki, Izumi; Kawauchi, Shigehiro; Sawada, Hiroshi; Nozaki, Hiroshi; Higuchi, Yuki; Miwa, Kazutoshi; Kondo, Yasuhito; Månsson, Martin; Telling, Mark; Coomer, Fiona C.; Cottrell, Stephen P.; Sasaki, Tsuyoshi; Kobayashi, Tetsuro; Sugiyama, Jun
• Is Part Of: Physical chemistry chemical physics. Volume 19:Issue 29(2017)
• Page Start: 19058
• Page End: 19066
• Publication Date: 2017-07-12
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c7cp02047c
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : We have demonstrated that a local magnetic probe, μ + SR, provides a self diffusion coefficient of Li in Li intercalated graphites. Abstract : In order to study a diffusive behavior of Li + in Li intercalated graphites, we have measured muon spin relaxation (μ + SR) spectra for C6 Li and C12 Li 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 ( E a ) for C6 Li is obtained as 270(5) meV, while E a = 170(20) meV for C12 Li. Assuming a jump diffusion of Li + in the Li layer of C6 Li and C12 Li, a self-diffusion coefficient D Li at 310 K was estimated as 7.6(3) × 10 −11 (cm 2 s −1 ) in C6 Li and 14.6(4) × 10 −11 (cm 2 s −1 ) in C12 Li.