Abstract
The Li-Sn phase diagram was re-investigated using differential thermal analysis (DTA). A special thermal analysis technique was used to clarify the characters of the invariant reactions between the liquid, Li17 Sn4 and Li7 Sn2 phases and between the liquid, Li7 Sn2 and Li13 Sn5 phases. Using this technique, the eutectic reaction: L虠 Li17 Sn4+ Li7 Sn2 and the peritectic reaction: L+ Li7 Sn2虠 Li13 Sn5 were confirmed. The enthalpy of formation of the Li17 Sn4 phase was measured using high temperature solution calorimetry. A self-consistent thermodynamic description of the Li-Sn system was developed using the CALPHAD method. The liquid phase was described using the associate model, the Li17 Sn4, Li13 Sn5, Li5 Sn2, Li7 Sn3, LiSn and Li2 Sn5 phases were modeled as stoichiometric compounds, and the Li7 Sn2 phase was modeled to exhibit a homogeneity range at higher temperatures. Phase diagrams and property diagrams calculated using the new thermodynamic description for the Li-Sn system are in good agreement with the experimental data performed in this work and with literature data.
Original language | English |
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Pages (from-to) | 181-195 |
Number of pages | 15 |
Journal | CALPHAD: the international research journal for calculation of phase diagrams |
Volume | 47 |
DOIs | |
Publication status | Published - Dec 2014 |
Austrian Fields of Science 2012
- 104003 Inorganic chemistry
- 104017 Physical chemistry
- 104011 Materials chemistry
Keywords
- Li-ion battery
- Experimental phase diagram
- CALPHAD
- Associate model
- LITHIUM-TIN SYSTEM
- CRYSTAL-STRUCTURE
- LIQUID ALLOYS
- ASSOCIATION MODEL
- BATTERIES
- DIFFRACTION
- POTASSIUM
- LI7SN2
- SODIUM