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Electrolyte and lithium ion secondary battery

A technology of electrolyte and lithium salt, which is applied in the field of electrolyte and can solve problems such as battery performance degradation

Active Publication Date: 2015-11-18
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, if a high-potential positive electrode is used, there is a problem that the performance of the battery decreases due to the decomposition of the electrolyte.

Method used

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  • Electrolyte and lithium ion secondary battery
  • Electrolyte and lithium ion secondary battery
  • Electrolyte and lithium ion secondary battery

Examples

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Effect test

preparation example Construction

[0120]

[0121] The method for preparing the electrolytic solution of the present embodiment may be a method as long as the above-mentioned non-aqueous solvent, the lithium salt, the above-mentioned fluorine-containing ether compound, and the above-mentioned optional components added as necessary can be uniformly dissolved or dispersed. , can be prepared in the same manner as known electrolytic solutions.

[0122] 《Lithium-ion secondary battery》

[0123] The lithium ion secondary battery of the present invention includes the electrolytic solution of the present invention described above. As for the configuration other than the electrolytic solution, a conventionally known configuration of a lithium ion secondary battery can be used.

[0124] Hereinafter, an embodiment having a usable configuration will be described.

[0125] As a configuration of the lithium ion secondary battery of the present embodiment, for example, an electrode element and an electrolytic solution in w...

Embodiment 1

[0156]

[0157] Will contain spinel LiNi 0.5 mn 1.5 o 4 A slurry of 92% by mass, 4% by mass of Ketjen Black, and 4% by mass of polyvinylidene fluoride was coated on a positive electrode current collector 1A made of aluminum foil (thickness 20 μm) and dried to prepare a positive electrode 1 with a thickness of 175 μm. In the same manner, a double-sided electrode obtained by coating the positive electrode 1 on both surfaces of the positive electrode current collector 1A and drying it was prepared.

[0158]

[0159] A slurry containing 85% by mass of SiO with an average particle diameter of 15 μm and 15% by mass of polyamic acid was coated on a negative electrode collector 2A made of copper foil (thickness 10 μm) and dried to prepare a negative electrode 2 with a thickness of 46 μm. The as-prepared anode was annealed at 350 °C for 3 h under a nitrogen atmosphere to cure the binder.

[0160]

[0161] The components shown in Table 1 were mixed so as to have the final conce...

Embodiment 2

[0167] When preparing the electrolytic solution, vinylboronic acid (N-methyliminodiacetic acid) methyl ester was further added as a boron compound so that the final concentration was 0.09% by mass, and it was carried out in the same manner as in Example 1.

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Abstract

This electrolyte is characterized by containing a non-aqueous solvent, a lithium salt, and a fluorine-containing ether compound represented by general formula (I). In the formula: R1 represents an alkyl group having 3-8 carbon atoms; R2 represents an alkyl group having one carbon atom; at least six of the hydrogen atoms bonded to the alkyl group of R1 are substituted with fluorine atoms; and at least one of the hydrogen atoms bonded to the alkyl group of R2 is substituted with a fluorine atom.

Description

technical field [0001] The present invention relates to an electrolyte solution that can be used for a lithium ion secondary battery, and the lithium ion secondary battery. this application claims priority based on Japanese Patent Application No. 2013-171605 for which it applied to Japan on August 21, 2013, and uses the content here. Background technique [0002] With the rapid expansion of markets such as notebook personal computers, mobile phones, and electric vehicles, secondary batteries with high energy density are required. As a method of obtaining a secondary battery with high energy density, a method of using a negative electrode material with a large capacity, a method of using a high-potential positive electrode, and the like have been developed. The voltage of the existing general lithium-ion secondary batteries is mostly 3.5-4.2V. However, a lithium ion secondary battery using a positive electrode having a high potential has a potential of 4.5 V or higher, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/0569
CPCH01M10/0567H01M10/0525H01M10/0569H01M2300/0025H01M2300/0034H01M2300/0037Y02E60/10Y02T10/70
Inventor 瓶子克豊川卓也
Owner SEKISUI CHEM CO LTD
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