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- Title
Synthesis and charge-discharge performance of LiSiN as a cathode material of lithium secondary batteries.
- Authors
Takeuchi, Y.; Yamashita, T.; Kuriyama, K.; Kushida, K.
- Abstract
LiSiN crystals are synthesized by direct reaction between LiN and SiN with the molar ratio LiN/SiN 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. By analogy with LiMgN, the broad peak at 580 cm with a half width of 140 cm is attributed to homogenously random distribution of Li and Si atoms. The band gap of LiSiN 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 LiMnO (1.63 eV or 2.00 eV) and that of Co in LiCoO (2.1 eV), suggesting that LiSiN is a possible cathode material. The 5 × 5 mm-sized lithium secondary battery of LiSiN cathode/propylene carbonate + LiClO electrolyte/Li anode structure shows a discharge capacity of 2.4 μAh cm for a discharge current of 1.0 μA.
- Subjects
LITHIUM compounds; CHEMICAL synthesis; SILICON compounds; NITROGEN compound synthesis; LITHIUM cell electrodes; ELECTROCHEMICAL electrodes
- Publication
Journal of Solid State Electrochemistry, 2016, Vol 20, Issue 7, p1885
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-016-3131-9