Effect of annealing temperature on electrochemical performance of thin-film LiMn2O4 cathode |
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| Affiliation: | 1. Key Laboratory of Space Applied Physics and Chemistry (Ministry of Education), School of Science, Northwestern Polytechnical University, Xi''an 710072, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;1. CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy;2. Physics Department, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Roma, Italy;3. ENEA, Materials and Physicochemical Processes Laboratory (SSPT-PROMAS-MATPRO), Via Anguillarese 301, 00123 Roma, Italy;4. School of Engineering, University of Padua, via Marzolo 9, 35131 Padova, Italy |
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| Abstract: | Spinel LiMn2O4 thin-film cathodes were obtained by spin-coating the chitosan-containing precursor solution on a Pt-coated silicon substrate followed by a two-stage heat-treatment procedure. The LiMn2O4 film calcined at 700 °C for 1 h showed the highest Li-ion diffusion coefficient, 1.55 × 10?12 cm2 s?1 (PSCA measurement) among all calcined films. It is attributed to the larger interstitial space and better crystal perfection of LiMn2O4 film calcined at 700 °C for 1 h. Consequently, the 700 °C-calcined LiMn2O4 film exhibited the best rate performance in comparison with the ones calcined at other temperatures. |
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