Semi-solid state electrolyte system including an oxysulfide solid-state electrolyte and solvate ionic liquid
AssigneeGM Global Technology Operations LLC
InventorsYubin Zhang, Thomas A. Yersak, Aaron Ketchum
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Abstract
A semi-solid-state electrolyte system for use in a battery cell is provided. The semi-solid-state electrolyte system includes an oxysulfide solid-state electrolyte and a secondary electrolyte including a solvate ionic liquid. The semi-solid-state electrolyte system is configured for providing excellent ionic conductivity, supporting high current densities at a low stack pressure, and including excellent chemical stability. The oxysulfide solid-state electrolyte and the solvate ionic liquid are collectively configured for facilitating ion transfer between an anode of the battery cell and a cathode of the battery cell.
Claims18
A semi-solid-state electrolyte system for use in a battery cell, comprising:
- an oxysulfide solid-state electrolyte;
- and
- a secondary electrolyte including a solvate ionic liquid;
- and
- wherein the oxysulfide solid-state electrolyte and the solvate ionic liquid are collectively configured for facilitating ion transfer between an anode of the battery cell and a cathode of the battery cell;
- wherein the oxysulfide solid-state electrolyte includes a composition of xM·(100-x-y)SF·yOF;
- wherein x is in a range from 40 molar percentage to 80 molar percentage and y is in a range from 5 molar percentage to 20 molar percentage;
- wherein M is a modifier including Li2S, Li2O, or a combination thereof;
- wherein SF is a sulfide former including P2S5, SiS2, SnS2, GeS2, B2S5, or a combination thereof;
- wherein OF is an oxide former including P2O5, SiO2, SnO2, GeO2, B2O3, or AlO3;
- and
- wherein the oxysulfide solid-state electrolyte comprises annealed Li3PS3.75O0.25 with x=75 and an ionic conductivity equal to 1.119 milliSiemens/centimeter at room temperature.
A separator for use in a battery cell, comprising
- a layer of oxysulfide solid-state electrolyte including a plurality of pores;
- and
- solvate ionic liquid filling a portion of the plurality of pores;
- and
- wherein the oxysulfide solid-state electrolyte and the solvate ionic liquid are collectively configured for facilitating ion transfer between an anode of the battery cell and a cathode of the battery cell;
- wherein the separator is reinforced with a filler;
- wherein the filler is present in a range from 1% to 20% as a percentage of total weight of the separator;
- wherein the filler includes a non-woven inorganic glass fiber paper;
- wherein the solvate ionic liquid comprises lithium bis(trifluoromethanesulfonyl)imide salt (LiTFSI) and triglyme (G3) at a 1:1 molar ratio (Li[G3]TFSI), and
- wherein the oxysulfide solid-state electrolyte comprises annealed Li3PS3.75O0.25 with an ionic conductivity equal to 0.703 milliSiemens/centimeter and a critical current density (CCD) equal to 1.8 milliamps/square centimeter.
A battery cell including a semi-solid-state electrolyte system, the battery cell comprising:
- an anode;
- a cathode;
- a separator disposed in-between the anode and the cathode;
- and
- the semi-solid-state electrolyte system, including:
- an oxysulfide solid-state electrolyte;
- and
- a secondary electrolyte including a solvate ionic liquid;
- and
- wherein the oxysulfide solid-state electrolyte and the solvate ionic liquid are collectively configured for facilitating ion transfer between the anode and the cathode;
- wherein the separator includes:
- a polymer separator body including a plurality of pores;
- a film, comprising the oxysulfide solid-state electrolyte, covering an anode side of the polymer separator body;
- the solvate ionic liquid filling a portion of the plurality of pores;
- wherein the solvate ionic liquid comprises lithium bis(trifluoromethanesulfonyl)imide salt (LiTFSI) and triglyme (G3) at 1:1 molar ratio (Li[G3]TFSI), and
- wherein the oxysulfide solid-state electrolyte comprises annealed Li3PS3.75O0.25 with an ionic conductivity equal to 0.703 milliSiemens/centimeter and a critical current density (CCD) equal to 1.8 milliamps/square centimeter.
Dependencies are inferred from the claim text.