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Non-aqueous electrolyte for lithium secondary cell or lithium-ion capacitor, and lithium secondary cell or lithium-ion capacitor in which same is used

A non-aqueous electrolyte, lithium secondary battery technology, applied in non-aqueous electrolyte storage batteries, hybrid capacitor electrolytes, secondary batteries, etc., can solve problems such as non-aqueous electrolyte solidification, achieve low freezing point, high conductivity, excellent Effects of Features

Active Publication Date: 2018-06-08
MU电解液株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, non-aqueous electrolytes may freeze at extremely cold temperatures below -40°C

Method used

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  • Non-aqueous electrolyte for lithium secondary cell or lithium-ion capacitor, and lithium secondary cell or lithium-ion capacitor in which same is used
  • Non-aqueous electrolyte for lithium secondary cell or lithium-ion capacitor, and lithium secondary cell or lithium-ion capacitor in which same is used
  • Non-aqueous electrolyte for lithium secondary cell or lithium-ion capacitor, and lithium secondary cell or lithium-ion capacitor in which same is used

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14、 comparative example 1～8

[0136] 〔Physical property measurement of non-aqueous electrolytic solution〕

[0137]

[0138] The flash points of the non-aqueous electrolytic solutions described in Table 1 and Table 2 were measured based on JIS K-2265 using a Tag closed-type flash point tester (manufactured by Tanaka Scientific Equipment Manufacturing Co., Ltd.; model ATG-7).

[0139]

[0140] The freezing points of the nonaqueous electrolytic solutions listed in Tables 1 and 2 were measured using an automatic freezing point meter (manufactured by Electrochemistry Systems Co., Ltd.; model CP-2BX) based on JIS K-0065.

[0141]

[0142] The conductivity of the nonaqueous electrolytic solutions described in Table 1 and Table 2 was measured in an environment of 25° C. using a conductivity meter (manufactured by DKK-TOA CORPORATION; model CM-30R).

[0143] Each physical property value is shown in Tables 1-2.

[0144] 〔Manufacture of lithium-ion secondary battery〕

[0145] Will LiNi 0.5 mn 0.3 co 0.2 o ...

Embodiment 15～25、 and comparative example 9～16

[0161] 〔Production of lithium ion capacitor〕

[0162] The specific surface area is 600~3000m 2 Activated carbon powder / g: 92% by mass, acetylene black (conductive agent): 5% by mass are mixed, and added to polyvinylidene fluoride (binder): 3% by mass dissolved in 1-methyl-2-pyrrolidone and mixing the obtained solution to prepare a positive electrode mixture paste. This positive electrode mixture paste was applied to one side of an aluminum foil (current collector), dried, pressurized, and then cut into a predetermined size to produce a positive electrode sheet. In addition, artificial graphite (d 002 = 0.335nm, negative electrode active material) 95% by mass was added to a solution obtained by dissolving 5% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone in advance and mixed to prepare a negative electrode mixture Paste. This negative electrode mixture paste was applied to one surface of a copper foil (current collector), dried, pressurized, and then ...

Embodiment 26～33、 comparative example 17～24

[0180] 〔Physical property measurement of non-aqueous electrolytic solution〕

[0181]

[0182] The flash points of the non-aqueous electrolytic solutions described in Table 4 and Table 5 were measured based on JISK-2265 using a Tag closed-type flash point tester (manufactured by Tanaka Scientific Equipment Manufacturing Co., Ltd.; model ATG-7).

[0183]

[0184] The freezing points of the nonaqueous electrolytic solutions listed in Tables 4 and 5 were measured using an automatic freezing point meter (manufactured by Electrochemistry Systems Co., Ltd.; model CP-2BX) based on JIS K-0065.

[0185]

[0186] The electrical conductivity of the nonaqueous electrolytic solutions described in Table 4 and Table 5 was measured in an environment of 25° C. using a conductivity meter (manufactured by DKK-TOA CORPORATION; model CM-30R).

[0187] Each physical property value is shown in Tables 4-5.

[0188] 〔Manufacture of lithium-ion secondary battery〕

[0189] Will LiNi 0.33 mn 0.3...

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Abstract

Disclosed is a non-aqueous electrolyte for a lithium secondary cell or a lithium-ion capacitor in which a lithium salt is dissolved at a specific amount in a non-aqueous solvent, wherein: the non-aqueous solvent contains specific amounts of ethylene carbonate, propylene carbonate, dimethyl carbonate, methylethyl carbonate, and a fluorinated chain ester; the total amount of ethylene carbonate and propylene carbonate contained in the non-aqueous solvent is in a specific range; the total amount of dimethyl carbonate and the fluorinated chain ester contained is in a specific range; and the non-aqueous electrolyte has a flash point of 20 DEG C or higher. Also disclosed is a non-aqueous electrolyte for a lithium secondary cell or a lithium-ion capacitor in which a lithium salt is dissolved at aspecific amount in a non-aqueous solvent, wherein: the non-aqueous solvent contains specific amounts of ethylene carbonate, propylene carbonate, dimethyl carbonate, methylethyl carbonate, and ethyl propionate; the total amount of ethylene carbonate and propylene carbonate contained in the non-aqueous solvent is in a specific range; the total amount of dimethyl carbonate and ethyl propionate contained is in a specific range; and the non-aqueous electrolyte has a flash point of 20 DEG C or higher.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte solution for a lithium secondary battery or a nonaqueous electrolyte solution for a lithium ion capacitor that does not solidify even at an extremely low temperature of -40°C and is excellent in battery performance such as withstand voltage, and A lithium secondary battery or a lithium ion capacitor using the same. Background technique [0002] In recent years, lithium secondary batteries and lithium-ion capacitors have been widely used not only as power sources for small electronic devices such as mobile phones and notebook computers, but also as power sources for electric vehicles, idling stops, and power supplies for power storage. In order to extend the cruising distance of these electric vehicles, the development of further higher voltage and higher energy density of power storage devices has been carried out. Therefore, electric vehicles have a possibility of a longer travel distance, and...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01G11/60H01M10/052H01M10/0567H01M10/0568
CPCH01G11/06H01G11/32H01G11/50H01G11/60H01G11/62H01M4/386H01M4/387H01M4/485H01M4/5825H01M4/587H01M10/052H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2220/20H01M2300/0034H01M2300/0042Y02E60/10Y02E60/13Y02T10/70H01M4/364H01M4/505H01M4/525
Inventor 安部浩司马场园诚近藤正英柳比吕志岛本圭
Owner MU电解液株式会社
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