Electrolyte solution and lithium ion secondary battery

A technology of electrolyte and ionic liquid, which is applied in the direction of secondary battery, non-aqueous electrolyte storage battery, secondary battery charging/discharging, etc. It can solve the problem of battery performance degradation and achieve the effect of reducing capacity reduction

Inactive Publication Date: 2018-03-27
SEKISUI CHEM CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when a high-potential positive electrode is used, the degradation of battery performance due to the decomposition of the electrolyte becomes a problem

Method used

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

Examples

Experimental program
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Effect test

preparation example Construction

[0132] "Preparation method of electrolyte solution"

[0133] The method for preparing the electrolytic solution of this embodiment may be any method as long as it can mix the above-mentioned non-aqueous solvent, lithium salt, fluorine compound, ionic liquid, and optional components added as needed, and dissolve or disperse each component uniformly. , can be prepared in the same manner as a known electrolytic solution.

[0134] Since the electrolytic solution of the present embodiment contains the above-mentioned non-aqueous solvent, lithium salt, fluorine compound, and ionic liquid, even if the lithium ion secondary battery equipped with the electrolytic solution is set to 4.5V or more, Compared with the past, it is still possible to reduce the capacity drop that occurs with the charge-discharge cycle.

[0135] [Lithium ion secondary battery]

[0136] A lithium ion secondary battery according to a second aspect of the present invention includes the electrolytic solution desc...

Embodiment 1

[0181] made with figure 1 A stacked laminate type lithium ion secondary battery having the structure shown is shown.

[0182] "negative electrode"

[0183] A slurry containing 69% by mass of SiO with an average particle size of 1 μm, 15% by mass of polyamic acid, 10% by mass of acetylene black, and 6% by mass of carbon nanotubes was coated on a negative electrode current collector made of copper foil (thickness 15 μm). A coating film was formed on the body 2A, and the coating film was dried to fabricate the negative electrode 2 with a thickness of 25 μm. The prepared negative electrode was annealed at 300° C. for 2 hours in an argon atmosphere to be cured.

[0184] "positive electrode"

[0185] The ternary system positive electrode material LiNi containing as the positive electrode active material 0.33 mn 0.33 co 0.33 o 2 A slurry of 90% by mass, 5% by mass of Ketjen Black as a conductive grade, and 5% by mass of polyvinylidene fluoride as a binder is coated on a posit...

Embodiment 2

[0195] As A, ethylene carbonate (EC) and diethyl carbonate (DEC) as a non-aqueous solvent and 1,1,2,3,3,3- Except for the solvent of hexafluoropropyl difluoromethyl ether, it carried out similarly to Example 1, and produced the lithium ion secondary battery of Example 2 of this invention.

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Abstract

An electrolyte solution which is characterized by containing: a nonaqueous solvent; a lithium salt; at least one fluorine-containing compound selected from among fluorine-containing ether compounds represented by general formula (1) and fluorine-containing carbonate compounds represented by general formula (2); and an ionic liquid represented by general formula (3) and / or an ionic liquid represented by general formula (4).

Description

technical field [0001] The invention relates to an electrolytic solution and a lithium ion secondary battery provided with the electrolytic solution. This application claims priority based on Japanese Patent Application No. 2015-171505 filed in Japan on August 31, 2015 and Japanese Patent Application No. 2015-219955 filed in Japan on November 9, 2015, the contents of which are cited here. Background technique [0002] With the rapid expansion of the market for notebook personal computers, mobile phones, electric vehicles, etc., secondary batteries with high energy density are being sought. As means for 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 3.5V-4.2V. However, a lithium ion secondary battery using a high-potential positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01G11/06H01G11/60H01G11/62H01G11/64H01M10/052H01M10/0568H01M10/0569
CPCH01G11/06H01G11/60H01G11/62H01G11/64H01M10/0567H01M10/0568H01M10/0569H01M10/0525Y02E60/10H01M10/44
Inventor 小林刚之瓶子克豊川卓也加纳正史辻井敬亘榊原圭太佐藤贵哉森永隆志正村亮
Owner SEKISUI CHEM CO LTD
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