Solid electrolyte and lithium battery comprising the solid electrolyte

A solid electrolyte, lithium battery technology, applied in solid electrolyte, electrolyte immobilization/gelation, non-aqueous electrolyte, etc., can solve the problems of deterioration, lack of flexibility, lithium-air battery is not effective, etc.

Inactive Publication Date: 2017-08-11
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid electrolytes comprising ceramics are strong but heavy and have the potential to crack due to lack of flexibility
On the other hand, solid electrolytes containing polymers are flexible but more likely to deteriorate and may not be effective in ensuring good cycle characteristics of lithium-air batteries

Method used

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  • Solid electrolyte and lithium battery comprising the solid electrolyte
  • Solid electrolyte and lithium battery comprising the solid electrolyte
  • Solid electrolyte and lithium battery comprising the solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] Example 1: Using PVDF, DEME, LiTFSI, 5% by weight SiO 2 , and do not use a separator to prepare a solid electrolyte membrane

[0149] Adding PVDF as a polymer and bis(trifluoromethanesulfonyl)imide N,N-diethyl-N as an ionic liquid to N-methylpyrrolidone (NMP) solvent at a weight ratio of 1:1:1 - After methyl-N-(2-methoxyethyl)ammonium (DEME), and LiTFSI as a lithium salt, 5 parts by weight of SiO as inorganic particles based on 100 parts by weight of DEME was added thereto 2 particles (having an average diameter of about 7 nm to about 20 nm) and stirred for about 20 minutes to prepare a mixed solution. The mixed solution was poured into a Teflon pan, dried in a drying room at room temperature for 2 days, and further dried under vacuum at a temperature of about 60° C. overnight to thereby obtain a solid electrolyte membrane. The solid electrolyte membrane is a flexible free-standing membrane and has a thickness of about 90 μm.

Embodiment 2

[0150] Example 2: Using PVDF, DEME, LiTFSI, 5% by weight SiO 2 , and a separator to prepare a 90 μm thick solid electrolyte membrane

[0151] After adding PVDF as a polymer, DEME as an ionic liquid, and LiTFSI as a lithium salt to the NMP solvent in a weight ratio of 1:1:1, 5 parts by weight of DEME based on 100 parts by weight of inorganic Granular SiO 2 particles (with an average diameter of about 7nm-20nm) and stirred for about 20 minutes to obtain a mixed solution. The mixed solution permeates the porous separator , dried in a drying room at room temperature for 2 days, and further dried under vacuum at about 60° C. overnight to remove the solvent and thereby obtain a solid electrolyte membrane. The solid electrolyte membrane is a flexible free-standing membrane and has a thickness of about 90 μm.

Embodiment 3

[0152] Example 3: Using PVDF, DEME, LiTFSI, 5% by weight SiO 2 , and a separator to prepare a 60 μm thick solid electrolyte membrane

[0153] A solid electrolyte membrane was prepared in the same manner as in Example 2, except that the thickness of the solid electrolyte membrane was changed to about 60 μm.

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Abstract

A solid electrolyte includes: an ionic liquid; a lithium salt; an inorganic particle; and a polymer, wherein an amount of the ionic liquid is greater than or equal to about 33 parts by weight, based on 100 parts by weight of the polymer. Also a lithium battery including the solid electrolyte and a method of preparing a composite electrolyte membrane including the solid electrolyte.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to, and all rights arising from, Korean Patent Application No. 10-2016-0013538 filed on February 3, 2016 at the Korean Intellectual Property Office, the contents of which are incorporated herein by reference in their entirety. technical field [0003] The present disclosure relates to a solid electrolyte and a lithium battery including the solid electrolyte. Background technique [0004] A lithium-air battery includes a negative electrode that allows deposition and dissolution of lithium ions, a positive electrode for oxidizing and reducing oxygen from air, and a lithium ion conducting medium between the positive and negative electrodes. [0005] A lithium-air battery can use lithium as a negative electrode and can have a high capacity because there is no need to store air in the battery as a positive electrode active material. Lithium-air batteries may thus have a high the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M12/08
CPCH01M10/0565H01M12/08H01M2300/0082H01M10/0525H01M2300/0085Y02E60/10
Inventor 金显珍金峻熙V.罗伊权赫载林东民姜基锡裵永准
Owner SAMSUNG ELECTRONICS CO LTD
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