Phase formation in the ternary system Li–Si–C

• There were no ternary phases observed in Li–Si–C.
• Li7Si3 was observed to form preferentially in all experiments rather than Li13Si4.
• The main three-phase equilibrium is α-Li2C2–Li7Si3–SiC.

A first study on the ternary phase diagram Li–Si–C is presented. On the basis of extrapolation calculations of the binary boundary systems, two alloys with key compositions were examined using DSC measurements, long-term annealing experiments and X-ray diffraction analysis. Stable phases were determined for the two key compositions. A three-phase equilibrium consisting of α-Li2C2, SiC and Li7Si3 was identified. Stable Li7Si3 was observed independently of the initial alloys used for the annealing experiments. Ternary phases were not observed.

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