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Abstract
The compositions Li10GeP2S12-x A x (A = O, Se) solid electrolytes were synthesized. As x inreases, the ionic conductivity of the Li10GeP2S12-x O x samples decreases from 2.8 mS/cm to 1.09 mS/cm. Li10GeP2S11.8Se0.2 has the highest ionic conductivity, 3.43 mS/cm, and the activation energy of 0.143 eV. The electrochemical stability is Li10GeP2S11.6O0.4 > Li10GeP2S12 > Li10GeP2S11.8Se0.2, and the electrochemical window of Li10GeP2S11.6O0.4 is about 1.40 – 3.00 V. The difference in electrochemical properties of Li10GeP2S12-x A x (A = O, Se) can be used as a way to improve the interface of Li10GeP2S12-type solid batteries.
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