Method for mixing LiPF6 electrolytes at elevated temperatures

Claim 1

A method for preparing an electrolyte solution comprising an electrolyte solvent, a polyalkylene oxide film forming agent, a prepolymer and LiPF 6 salt while inhibiting decomposition of the LiPF 6 salt which method comprises the steps of: (a) combining the electrolyte solvent and the prepolymer and mixing until homogeneous; (b) adding the polyalkylene oxide film forming agent to the composition prepared in step (a) above and mixing until a uniform dispersion is formed as evidenced by the lack of solids visible in the dispersion; (c) heating the composition produced in step (b) above at a temperature above 55° C. until the polyalkylene oxide is dissolved; (d) cooling the composition prepared in step (c) to a temperature above the precipitation point for the polyalkylene oxide film forming agent to 50° C.; and (e) adding the LiPF 6 to the composition prepared in step (d) while maintaining the temperature in said composition above the precipitation point for the polyalkylene oxide film forming agent and less than 55° C. so as to form an electrolyte solution.

Claim 2

A method for preparing an electrolyte solution comprising an electrolyte solvent, a polyalkylene oxide film forming agent, a prepolymer and LiPF 6 salt while inhibiting decomposition of the LiPF 6 salt which method comprises the steps of: (a) combining the electrolyte solvent and the prepolymer and mixing until homogeneous; (b) adding the polyalkylene oxide film forming agent to the composition prepared in step (a) above and mixing until a uniform dispersion is formed as evidenced by the lack of solids visible in the dispersion; (c) heating the composition produced in step (b) above at a temperature above 55° C. until the polyalkylene oxide is dissolved; (d) cooling the composition prepared in step (c) to a temperature above the precipitation point for the polyalkylene oxide film forming agent to 50° C.; and (e) adding the LiPF 6 to the composition prepared in step (d) while maintaining the temperature in said composition above the precipitation point for the polyalkylene oxide film forming agent and less than 55° C. so as to form an electrolyte solution.

Claim 11

A method for preparing an electrolyte solution comprising an electrolyte solvent, a polyalkylene oxide film forming agent, a prepolymer and LiPF 6 salt while inhibiting decomposition of the LiPF 6 salt which method comprises the steps of: (a) combining the electrolyte solvent and the prepolymer and mixing until homogeneous; (b) adding the polyalkylene oxide film forming agent to the composition prepared in step (a) above and mixing until a uniform dispersion is formed as evidenced by the lack of solids visible in the dispersion; (c) heating the composition produced in step (b) above at a temperature above 55° C. until the polyalkylene oxide is dissolved; (d) cooling the composition prepared in step (c) to a temperature above the precipitation point for the polyalkylene oxide film forming agent to 50° C.; and (e) adding the LiPF 6 to the composition prepared in step (d) while maintaining the temperature in said composition from 45° C. to 50° C. so as to form an electrolyte solution wherein the electrolyte solution produced in step (e) comprises from about 40 to 80 weight percent electrolyte solvent, from about 5 to 30 weight percent of prepolymer, from about 1 to 10 weight percent of polyalkylene oxide film forming agent, and from about 5 to 25 weight percent of the LiPF 6 salt each based on the total weight of the electrolyte solution.

Claim 12

A method for preparing an electrolyte solution comprising an electrolyte solvent, a polyalkylene oxide film forming agent, a prepolymer and LiPF 6 salt while inhibiting decomposition of the LiPF 6 salt which method comprises the steps of: (a) combining the electrolyte solvent and the prepolymer and mixing until homogeneous; (b) adding the polyalkylene oxide film forming agent to the composition prepared in step (a) above and mixing until a uniform dispersion is formed as evidenced by the lack of solids visible in the dispersion; (c) heating the composition produced in step (b) above at a temperature above 55° C. until the polyalkylene oxide is dissolved; (d) cooling the composition prepared in step (c) to a temperature above the precipitation point for the polyalkylene oxide film forming agent to 50° C.; and (e) adding the LiPF 6 to the composition prepared in step (d) while maintaining the temperature in said composition from 45° C. to 50° C. so as to form an electrolyte solution wherein the electrolyte solution produced in step (e) comprises from about 40 to 80 weight percent electrolyte solvent, from about 5 to 30 weight percent of prepolymer, from about 1 to 10 weight percent of polyalkylene oxide film forming agent, and from about 5 to 25 weight percent of the LiPF 6 salt each based on the total weight of the electrolyte solution.

Claim 19

A method for preparing an electrolyte solution comprising an electrolyte solvent which is a mixture of triglyme and propylene carbonate or ethylene carbonate, a polyethylene oxide film forming agent having a number average molecular weight of from about 500,000 to about 750,000, a urethane acrylate prepolymer having a molecular weight of from about 500 to about 30,000 and from 1 to 4 acrylate groups, and LiPF 6 salt while inhibiting decomposition of the LiPF 6 salt which method comprises the steps of: (a) combining the electrolyte solvent and the prepolymer and mixing until homogeneous; (b) adding the polyethylene oxide film forming agent to the composition prepared in step (a) above and mixing until a uniform dispersion is formed as evidenced by the lack of solids visible in the dispersion; (c) heating the composition produced in step (b) above at a temperature above 55° C. until the polyethylene oxide is dissolved; (d) cooling the composition prepared in step (c) to a temperature above the precipitation point for the polyethylene oxide film forming agent to 50° C.; and (e) adding the LiPF 6 to the composition prepared in step (d) while maintaining the temperature in said composition above the precipitation point for the polyethylene oxide film forming agent and less than 55° C. so as to form an electrolyte solution wherein the electrolyte solution produced in step (e) comprises from about 40 to 80 weight percent electrolyte solvent, from about 5 to 30 weight percent of prepolymer, from about 1 to 10 weight percent of polyethylene oxide film forming agent, and from about 5 to 25 weight percent of the LiPF 6 salt each based on the total weight of the electrolyte solution.

Claim 20

A method for preparing an electrolyte solution comprising an electrolyte solvent which is a mixture of triglyme and propylene carbonate or ethylene carbonate, a polyethylene oxide film forming agent having a number average molecular weight of from about 500,000 to about 750,000, a urethane acrylate prepolymer having a molecular weight of from about 500 to about 30,000 and from 1 to 4 acrylate groups, and LiPF 6 salt while inhibiting decomposition of the LiPF 6 salt which method comprises the steps of: (a) combining the electrolyte solvent and the prepolymer and mixing until homogeneous; (b) adding the polyethylene oxide film forming agent to the composition prepared in step (a) above and mixing until a uniform dispersion is formed as evidenced by the lack of solids visible in the dispersion; (c) heating the composition produced in step (b) above at a temperature above 55° C. until the polyethylene oxide is dissolved; (d) cooling the composition prepared in step (c) to a temperature above the precipitation point for the polyethylene oxide film forming agent to 50° C.; and (e) adding the LiPF 6 to the composition prepared in step (d) while maintaining the temperature in said composition above the precipitation point for the polyethylene oxide film forming agent and less than 55° C. so as to form an electrolyte solution wherein the electrolyte solution produced in step (e) comprises from about 40 to 80 weight percent electrolyte solvent, from about 5 to 30 weight percent of prepolymer, from about 1 to 10 weight percent of polyethylene oxide film forming agent, and from about 5 to 25 weight percent of the LiPF 6 salt each based on the total weight of the electrolyte solution.