Preparation of new lithium ion composite electrolyte 3Li4SiS4–0.5La2S3 by mechanical milling

A new binary composite electrolyte of 3Li4SiS4–0.5La2S3 was successfully prepared by mechanical milling for 10 h. In the composition, Li4SiS4 was mainly in amorphous phase, and La2S3 kept in crystal phase. The total lithium ion conductivities at 27 °C (σ27) and 150 °C (σ150) were calculated to be 2.77 × 10−4 S/cm and 1.84 × 10−2 S/cm, respectively. The corresponding activation was calculated to be 38 kJ/mol. And the electrochemical stability was found in a wide potential range of up to 5.5 V vs. Li+/Li. For comparison, quenching technique was used to prepare the sample and the results showed that it is inferior to mechanical milling.

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