High-conduction GE substituted LiAsS4 solid electrolyte
A solid electrolyte for a lithium battery includes Li 3+x Ge x As 1-x S 4 where x=0 to 0.50. The value of x can be a range of any high value and any lower value from 0 to 0.50. For example, x can be 0.25 to 0.50, and x can be 0.3 to 0.4, among many other possible ranges. In one embodiment x=0.33 such that the solid electrolyte is Li 3.334 Ge 0.334 As 0.666 S 4 . A solid electrolyte for a lithium battery can include LiAsS 4 wherein ½ to ⅔ of the As is substituted with Ge. A lithium battery and a method for making a lithium battery are also disclosed.
1. A solid electrolyte for a lithium battery, comprising Li 3+x Ge x As 1-x S 4 where x=0 to 0.50, and having an ionic conductivity of greater than 1 mScm −1 at 27° C. and an activation energy of no more than 0.3 eV.
2. The solid electrolyte of claim 1 wherein x=0.25 to 0.5.
3. The solid electrolyte of claim 1 , wherein x=0.3 to 0.4.
4. The solid electrolyte of claim 1 , wherein x=0.33.
5. The solid electrolyte of claim 1 , wherein the electrolyte has an ionic conductivity of at least 1.12 mScm −1 at 27° C.
6. A lithium battery comprising a solid electrolyte, the solid electrolyte comprising Li 3+x Ge x As 1-x S 4 , wherein x=0 to 0.50, and having an ionic conductivity of greater than 1 mScm −1 at 27° C. and an activation energy of no more than 0.3 eV.
7. The lithium battery of claim 6 , wherein x=0.25 to 0.50.
8. The lithium battery of claim 6 , wherein x=0.3 to 0.4.
9. The lithium battery of claim 6 , wherein x=0.33.
10. The lithium battery of claim 6 , wherein the electrolyte has an ionic conductivity of at least 1.12 mScm −1 at 27° C.
11. A solid electrolyte for a lithium battery, comprising LiAsS 4 wherein ½ to % of the As is substituted with Ge.
12. A lithium battery comprising a solid electrolyte, the solid electrolyte comprising LiAsS 4 wherein ½ to ⅔ of the As is substituted with Ge.
13. A method of making a lithium battery, comprising the steps of:
providing an anode and a cathode;
positioning between the anode and the cathode a solid electrolyte, wherein the electrolyte comprises Li 3+x Ge x As 1-x S 4 where x=0 to 0.50, and having an ionic conductivity of greater than 1 mScm −1 at 27° C. and an activation energy of no more than 0.3 eV.