Electrolyte for lithium secondary battery and lithium secondary battery comprising same
US-2019051940-A1 · Feb 14, 2019 · US
Lithium-sulfur secondary battery
US12255331B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12255331-B2 |
| Application number | US-201916971177-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 24, 2019 |
| Priority date | Oct 26, 2018 |
| Publication date | Mar 18, 2025 |
| Grant date | Mar 18, 2025 |
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Abstract
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A lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution are provided. The positive electrode has an SC factor value of 0.45 or more. The electrolyte solution includes a solvent and a lithium salt, and the solvent includes a first solvent having a DV 2 factor value of 1.7 or less, and a second solvent which is a fluorinated ether-based solvent.
First claim
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The invention claimed is: 1. A lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution, wherein the positive electrode has an SC factor value of 0.45 or more represented by Equation 1 below: SC factor = ∝ × L P [ Equation 1 ] wherein P is the porosity (%) of the positive electrode active material layer in the positive electrode, L is the mass of sulfur (mg/cm 2 ) per unit area of the positive electrode active material layer in the positive electrode, and α is 10 (constant), wherein the electrolyte solution comprises a first solvent, a second solvent, and a lithium salt, wherein the first solvent is selected from the group consisting of propionitrile, dimethylacetamide, dimethylformamide, triethylamine, 1-iodopropane, and or combinations thereof, and wherein the second solvent is a fluorinated ether-based solvent. 2. The lithium-sulfur secondary battery according to claim 1 , wherein the electrolyte solution comprises a solvent and a lithium salt, and the solvent includes a first solvent having a DV 2 factor value of 1.75 or less represented by Equation 2 below, and the lithium-sulfur secondary battery has an NS factor value of 3.5 or less represented by Equation 3 below: DV 2 factor = γ × μ DV [ Equation 2 ] wherein DV is the dipole moment per unit volume (debye (D)·mol/L), μ is the viscosity of the solvent (cP, 25° C.), and γ is 100 (constant), NS factor = DV 2 factor SC factor [ Equation 3 ] wherein SC factor is equal to the value defined by Equation 1 above, and DV 2 factor is equal to the value defined by Equation 2 above. 3. The lithium-sulfur secondary battery according to claim 1 , wherein the lithium-sulfur secondary battery has an ED factor value of 850 or more represented by Equation 4 below: ED factor = V × SC factor × C D [ Equation 4 ] wherein V is the nominal discharging voltage (V) for Li/Li + , D is the density of electrolyte solution (g/cm 3 ), C is the discharging capacity (mAh/g) at the time of discharging at 0.1 C rate, and SC factor is equal to the value defined by Equation 1 above. 4. The lithium-sulfur secondary battery according to claim 1 , wherein the second solvent is selected from the group consisting of 1H, 1H,2′H,3H-decafluorodipropyl ether, difluoromethyl 2,2,2-trifluoroethyl ether, 1,2,2,2-tetrafluoroethyl trifluoromethyl ether, 1,1,2,3,3,3-hexafluoropropyl difluoromethyl ether, pentafluoroethyl 2,2,2-trifluoroethyl ether, 1H, 1H,2′H-perfluorodipropyl ether, and combinations thereof. 5. The lithium-sulfur secondary battery according to claim 1 , wherein the solvent contains the first solvent in an amount of 1% by weight to 50% by weight. 6. The lithium-sulfur secondary battery according to claim 1 , wherein the solvent contains the second solvent in an amount of 50% by weight to 99% by weight. 7. The lithium-sulfur secondary battery according to claim 1 , wherein the solvent comprises the first solvent and the second solvent in a weight ratio of 3:7 to 1:9.
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Classifications
Mixture of solvents · CPC title
Positive electrodes · CPC title
Physical characteristics, e.g. porosity, surface area · CPC title
- H01M4/13Primary
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title
Liquid materials · CPC title
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- What does patent US12255331B2 cover?
- A lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution are provided. The positive electrode has an SC factor value of 0.45 or more. The electrolyte solution includes a solvent and a lithium salt, and the solvent includes a first solvent having a DV 2 factor value of 1.7 or less, and a second solvent which is a fluorina…
- Who is the assignee on this patent?
- Lg Energy Solution Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/13. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 18 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 10 related publications on this page (citations in our corpus or others sharing the same primary CPC).