# US 2026/0074293 A1 · Non-aqueous solvent electrolyte formulations for energy storage devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0074293 A1 - Document ID: US20260074293A1 - Status: Published application - Kind: A1 - Application number: 19/388,834 - Filed: 2025-11-13 - Published: 2026-03-12 - Earliest claimed: 2017-11-17 - Assignees: Tesla, Inc. - Applicants: Tesla, Inc. - Inventors: Joon Ho Shin; Hieu Minh Duong; Wilma Wong - Web page: https://patentgrep.com/patent/US20260074293A1 ## CPC - H01M 10/0569: characterised by the solvents - H01G 11/60: characterised by the solvent - H01G 11/62: characterised by the solute, e.g. salts, anions or cations therein - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] - H01M 4/38: of elements or alloys - H01M 4/587: for inserting or intercalating light metals - H01M 2300/0037: Mixture of solvents - H01M 2300/004: Three solvents - H01M 2300/0042: Four or more solvents - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided herein are improved electrolyte formulations. The improved performance may be realized as improved discharge rate cycling, improved capacity, improved Coulombic efficiency, or improved capacity upon cycling. ## Claims ### Claim 1 An electrolyte for an energy storage device, comprising: a lithium salt; and a non-aqueous electrolyte solvent formulation comprising ethylene carbonate (EC) and ethyl methyl carbonate (EMC), wherein the volume ratio of EC to EMC is about 1:2.4 to about 1:4. ### Claim 2 (depends on 1) The electrolyte of claim 1, wherein the non-aqueous electrolyte solvent further comprises dimethylcarbonate (DMC). ### Claim 3 (depends on 2) The electrolyte of claim 2, wherein the non-aqueous electrolyte solvent comprises EC/DMC in a volume ratio of 1:3. ### Claim 4 (depends on 1) The electrolyte of claim 1, wherein the non-aqueous electrolyte solvent comprises EC/EMC in a volume ratio of 1:2.4. ### Claim 5 (depends on 1) The electrolyte of claim 1, wherein the non-aqueous electrolyte solvent comprises EC/EMC in a volume ratio of 1:4. ### Claim 6 (depends on 1) The electrolyte of claim 1, wherein the non-aqueous electrolyte solvent further comprises dimethylcarbonate (DMC), and comprises EC/DMC in a volume ratio of 1:4. ### Claim 7 (depends on 1) The electrolyte of claim 1, wherein the volume ratio of EC to EMC is about 1:3 to about 1:4. ### Claim 8 (depends on 1) The electrolyte of claim 1, wherein the non-aqueous electrolyte solvent consists essentially of EC and EMC. ### Claim 9 (depends on 1) The electrolyte of claim 1, wherein the lithium salt is LiPF6. ### Claim 10 (depends on 1) An energy storage device, comprising: a cathode comprising a cathode active material; an anode comprising an anode active material; a separator between the cathode and the anode; and the electrolyte of claim 1; wherein at least one of the cathode and the anode independently further comprise a binder; and wherein at least one of the cathode and the anode are free from solvent residue. ### Claim 11 (depends on 10) The energy storage device of claim 10, wherein the anode active material comprises surface modified artificial graphite, wherein the surface modified artificial graphite is surface modified with amorphous carbon, ### Claim 12 (depends on 10) The energy storage device of claim 10, the binder comprises a fibrillized binder. ### Claim 13 (depends on 12) The energy storage device of claim 12, wherein the fibrillized binder comprises PTFE. ### Claim 14 (depends on 10) The energy storage device of claim 10, wherein the binder further comprises an additional binder. ### Claim 15 (depends on 14) The energy storage device of claim 14, wherein the additional binder is selected from a carboxymethylcellulose (CMC), polyvinylidene fluoride (PVDF), co-polymers thereof, and combinations thereof. ### Claim 16 (depends on 14) The energy storage device of claim 14, wherein the binder consists essentially of the fibrillizable binder and the additional binder. ### Claim 17 (depends on 10) The energy storage device of claim 10, wherein the binder consists essentially of the fibrillizable binder. ### Claim 18 (depends on 10) The energy storage device of claim 10, wherein at least one of the anode active material and the cathode active material comprise spherical-shaped particles. ### Claim 19 (depends on 10) The energy storage device of claim 10, wherein the anode active material further comprises natural graphite. ### Claim 20 (depends on 10) The energy storage device of claim 10, wherein the anode active material further comprises flake-shaped artificial graphite. ### Claim 21 (depends on 10) The energy storage device of claim 10, wherein the cathode active material comprises layered lithium nickel manganese cobalt oxide (NMC). ### Claim 22 (depends on 10) The energy storage device of claim 10, wherein the cathode active material comprises sulfur or a material including sulfur. ### Claim 23 (depends on 10) The energy storage device of claim 10, wherein the energy storage device has a capacity retention after 500 cycles of at least about 80%. ### Claim 24 (depends on 10) The energy storage device of claim 10, wherein the energy storage device has a first charge capacity of at least about 150 mAh/g. ### Claim 25 (depends on 10) The energy storage device of claim 10, wherein the energy storage device has a first discharge capacity of at least about 100 mAh/g. ### Claim 26 (depends on 10) The energy storage device of claim 10, wherein the energy storage device has an efficiency of at least about 70%. ### Claim 27 (depends on 10) The energy storage device of claim 10, wherein the energy storage device has a charge capacity retention at 1 C of at least about 94%. ### Claim 28 (depends on 10) The energy storage device of claim 10, wherein the energy storage device has a discharge capacity retention at 1 C of at least about 65%. ### Claim 29 (depends on 10) A method of forming an energy storage device of claim 10, comprising: providing a housing, placing into the housing the cathode, the anode and the separator between the cathode and the anode; and placing into the housing the electrolyte to form the energy storage device.