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Lithium-sulfur secondary battery

A lithium-sulfur secondary battery and electrolyte technology, applied in the direction of secondary battery, lithium storage battery, secondary battery repair/maintenance, etc., can solve the problems of difficulty in normal operation of the battery, increase in concentration, increase in side reactions, etc.

Pending Publication Date: 2020-10-27
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to build high energy density, a low content electrolyte should be injected, but as the content of the electrolyte decreases, the concentration of lithium polysulfide in the electrolyte will increase, and thus, due to the decrease of the mobility of the active material and the decrease of side reactions increase, making it difficult to perform normal work on the battery

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0088] While using water as a solvent, sulfur, Super-P (SP), a conductive material, and a binder were mixed by a ball mill to prepare a positive electrode active material layer forming composition. In this case, DENKA carbon black was used as the conductive material, and a mixed binder of SBR and CMC was used as the binder, and the mixing ratio of sulfur and SP (9:1 ratio): conductive material: binder was as follows 90:10:10 by weight. The prepared composition for forming a positive electrode active material layer was coated on an aluminum current collector, and then dried to prepare a positive electrode (energy density of the positive electrode: 6.18mAh / cm 2 ). The porosity of the positive electrode active material layer calculated by measuring the electrode weight and electrode thickness of the prepared positive electrode (using TESA-μHITE equipment from TESA Corporation) was 74%. The mass of sulfur per unit area of ​​the positive electrode active material layer is 3.75 mg...

Embodiment 2

[0092] Except by changing the preparation conditions of the positive electrode, so that the porosity of the positive electrode active material layer is 74%, the mass of sulfur per unit area of ​​the positive electrode active material layer is 3.33mg / cm 2 , and a lithium-sulfur secondary battery was fabricated in the same manner as in Example 1, except that the positive electrode was prepared in such a manner that the SC factor value calculated based on these values ​​was 0.45.

Embodiment 3

[0113] A lithium-sulfur secondary battery was fabricated in the same manner as in Example 1, except that dimethylacetamide was used instead of propionitrile as the first solvent by changing the preparation conditions of the electrolyte, and the dimethylacetamide has a dipole moment per unit volume of 59.29 D mol / L, a solvent viscosity (25°C) of 0.61 cP and a DV of 1.02 calculated based on these values 2 factor value.

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Abstract

The present invention provides a lithium-sulfur secondary battery comprising a cathode, an anode, a separator and an electrolytic solution. The cathode has an SC factor, represented by mathematical formula 1, of 0.45 or greater. The electrolytic solution comprises a solvent and a lithium salt, and the solvent comprises a first solvent having a DV2 factor represented by mathematical formula 2, of 1.7 or less, and a second solvent which is a fluorinated ether-based solvent.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0128729 filed on October 26, 2018 and Korean Patent Application No. 10-2019-0131538 filed on October 22, 2019, which Korean Patent The entire content of the application is incorporated herein by reference. [0002] The present invention relates to a lithium-sulfur secondary battery. Background technique [0003] As the application fields of secondary batteries expand to electric vehicles (EV) and energy storage devices (ESS), lithium-ion secondary batteries with relatively low gravimetric energy storage density (~250Wh / kg) are useful are facing restrictions. Alternatively, lithium-sulfur secondary batteries are attracting attention as a next-generation secondary battery technology due to their theoretically high gravimetric energy storage density (~2600 Wh / kg). [0004] A lithium-sulfur secondary battery refers to a battery system that uses a sulfur-contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0569H01M10/052H01M10/42H01M4/02
CPCY02E60/10H01M10/052H01M10/0569H01M2004/021H01M2004/028H01M4/136H01M4/5815H01M10/056H01M2300/0037H01M2300/0034H01M4/13H01M2010/4292H01M2220/10H01M2220/20H01M2004/027H01M2300/0028
Inventor 朴寅台梁斗景崔溁哲金秀炫李昌勋
Owner LG ENERGY SOLUTION LTD
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