Gel electrolyte for lithium ion secondary battery and preparation method of gel electrolyte

A gel electrolyte and secondary battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as easy to decompose lithium, low conductivity, and difficult ion conduction

Active Publication Date: 2014-04-23
XIAMEN SHOUNENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Conventional gel electrolyte is as described in CN03158361.X "Lithium-ion battery gel electrolyte and preparation method of the electrolyte" (authorized publication number CN1301565) authorized and disclosed in Chinese patent literature on February 21, 2007. Polymerizable monomers whose polymers are insoluble in liquid electrolyte often require a higher monomer concentration, and after polymerization, d

Method used

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  • Gel electrolyte for lithium ion secondary battery and preparation method of gel electrolyte
  • Gel electrolyte for lithium ion secondary battery and preparation method of gel electrolyte
  • Gel electrolyte for lithium ion secondary battery and preparation method of gel electrolyte

Examples

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Embodiment 1

[0024] A kind of preparation method step of gel electrolyte for lithium ion secondary battery is as follows:

[0025] Step 1, preparing the gel electrolyte: adding 0.1% by mass of polymerizable monomers (B, C) to 90% by mass of the electrolyte matrix (A); among them, the first polymerizable monomer should be first Add the monomer (B) into the electrolyte matrix (A), stir evenly, and then add the second polymerizable monomer (C). The first polymerizable monomer (B) is styrene with a mass percentage of 40% in the polymerizable monomers (B, C), and the second polymerizable monomer (C) is The mass percent of polymerizable monomers (B, C) is 60% ethylene glycol dimethacrylate. The reactivity ratio of the first polymerizable monomer (B) among the polymerizable monomers (B, C) is less than that of the second polymerizable monomer (C), r C with r B The ratio is 1.5. Then add 9% initiator (D) of mass percent, described initiator (D) is dibenzoyl peroxide and mass percent and be 0.9...

Embodiment 2

[0029] A kind of preparation method step of gel electrolyte for lithium ion secondary battery is as follows:

[0030] Step 1, preparation of gel electrolyte: add polymerizable monomers (B, C) with a mass percentage of 7% to an electrolyte matrix (A) with a mass percentage of 85%; among them, the first polymerizable monomer should be first Add the monomer (B) into the electrolyte matrix (A), stir evenly, and then add the second polymerizable monomer (C). The first polymerizable monomer (B) is acrylamide with a mass percentage of 30% in the polymerizable monomers (B, C), and the second polymerizable monomer (C) is The mass percent of polymerizable monomers (B, C) is 70% ethylene glycol dimethacrylate. The reactivity ratio of the first polymerizable monomer (B) among the polymerizable monomers (B, C) is less than that of the second polymerizable monomer (C), r C with r B The ratio is 2.33. Then add the initiator (D) that mass percentage is 3%, and described initiator (D) is t...

Embodiment 3

[0034] A kind of preparation method step of gel electrolyte for lithium ion secondary battery is as follows:

[0035] Step 1, preparing the gel electrolyte: adding 15% by mass of polymerizable monomers (B, C) to 70% by mass of the electrolyte matrix (A); among them, the first polymerizable monomer should be first Add the monomer (B) into the electrolyte matrix (A), stir evenly, and then add the second polymerizable monomer (C). The first polymerizable monomer (B) is 50% by mass of hydroxyethyl acrylate in the polymerizable monomers (B, C), and the second polymerizable monomer (C) It is the ethylene glycol dimethacrylate that accounts for 50% by mass in the polymerizable monomer (B, C). Then adding mass percent is 7% initiator (D) cumene hydroperoxide and mass percent is 8% blowing agent (E) fully stirring system, described blowing agent (E) is ammonium bicarbonate, prepares To obtain the precursor solution of the gel electrolyte.

[0036] Step 2, gel: pour the precursor sol...

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Abstract

The invention discloses a gel electrolyte for a lithium ion secondary battery. The gel electrolyte comprises the following components by mass percent: 70%-90% of an electrolyte substrate (A), 0.1-25% of polymerizable monomers (B,C), 0.1-10% of an initiator (D), and 0.1-15% of a foamer (E), wherein the polymerizable monomers (B,C) comprise a first polymerizable monomer (B) and a second polymerizable monomer (C), and the first polymerizable monomer (B) can be dissolved in the electrolyte substrate (A) but the homopolymer of the first polymerizable monomer (B) can not be dissolved in the electrolyte substrate (A), and the second polymerizable monomer (C) and the homopolymer thereof can be dissolved in the electrolyte substrate (A); the foamer (E) has the chemical formula as shown in the description, wherein X is one of metallic ions including Mn, Mg, Al and the like or ammonium salt materials, and Y is one of alkyl compounds with H atoms and 1-10 carbon atoms or aryl compounds. According to the invention, the chemical safety performance is good, electrical property is superior, and the cycle performance and the rate performance of the battery is preferable, the service life of the battery is prolonged greatly.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a lithium-ion secondary battery gel electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used as power sources for various mobile devices since their commercialization due to their many advantages such as high operating voltage, high energy density, no memory effect, long cycle life, and no pollution. [0003] Lithium-ion batteries are composed of positive electrodes, negative electrodes, separators, electrolytes, and other auxiliary materials. The electrolyte conducts lithium ions between the positive and negative electrodes of the battery, which has an important impact on the performance of the battery. Electrolyte can be divided into liquid electrolyte and gel electrolyte. The liquid electrolyte is generally composed of high-purity organic solvents, electrolyte lithium salts and additives i...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 谭海荣林礼杰
Owner XIAMEN SHOUNENG TECH
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