Abstract
Li5SiN3 crystals are synthesized by direct reaction between Li3N and Si3N4 with the molar ratio Li3N/Si3N4 of 10:1. Reaction is performed at 1073 K for 1 h under a nitrogen atmosphere of 700 Torr. The lattice constant determined by the X-ray powder diffraction method is 4.718 Å. Four broad Raman peaks are observed at 196, 286, 580, and 750 cm−1. By analogy with LiMgN, the broad peak at 580 cm−1 with a half width of 140 cm−1 is attributed to homogenously random distribution of Li and Si atoms. The band gap of Li5SiN3 is found to be a direct gap of about 2.5 eV by optical absorption and photoacoustic spectroscopy methods. Comparison with the conventional cathode materials for lithium ion batteries, this gap value is close to d-d transition energy of Mn in LiMn2O4 (1.63 eV or 2.00 eV) and that of Co in LiCoO2 (2.1 eV), suggesting that Li5SiN3 is a possible cathode material. The 5 × 5 mm2-sized lithium secondary battery of Li5SiN3 cathode/propylene carbonate + LiClO4 electrolyte/Li anode structure shows a discharge capacity of 2.4 μAh cm−2 for a discharge current of 1.0 μA.
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Takeuchi, Y., Yamashita, T., Kuriyama, K. et al. Synthesis and charge-discharge performance of Li5SiN3 as a cathode material of lithium secondary batteries. J Solid State Electrochem 20, 1885–1888 (2016). https://doi.org/10.1007/s10008-016-3131-9
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DOI: https://doi.org/10.1007/s10008-016-3131-9