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Nonaqueous electrolyte solution, electrochemical energy storage device using same, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, dialkoxyethane technology, applied in the field of non-aqueous electrolyte secondary batteries, can solve the problems of discoloration, insolubility of lithium salts, etc.

Inactive Publication Date: 2008-04-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if these salts are to be used to prepare non-aqueous electrolytes with a high ion concentration such as 1,2-dialkoxyethane / lithium salt in a molar ratio of 1 / 1, lithium salts are not soluble, or are mixed with LiBF 4 The non-aqueous electrolyte prepared in the same way will change color, or the non-aqueous electrolyte will be solid at room temperature, so it is difficult to use it as a non-aqueous electrolyte for electrochemical energy storage devices

Method used

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  • Nonaqueous electrolyte solution, electrochemical energy storage device using same, and nonaqueous electrolyte secondary battery
  • Nonaqueous electrolyte solution, electrochemical energy storage device using same, and nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The effects of different non-aqueous electrolyte solutions on high-temperature stability according to the type of lithium salt were studied. DME, DEE and LiTFSI are mixed in a ratio of (0.5+0.5) / 1 according to the molar ratio of (DME+DEE) / LiTFSI, so as to prepare a non-aqueous electrolyte. The obtained liquid was transparent at normal temperature.

[0048] The prepared non-aqueous electrolyte solution is filled into a container made of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (hereinafter referred to as PFA) and tightly closed, and then the PFA container is stored in an aluminum laminated bag, and then sealed . After the container was stored at 60° C. for 10 days, changes in the color tone of the nonaqueous electrolyte solution were investigated. As a result, the nonaqueous electrolytic solution of Example 1 maintained a transparent state.

Embodiment 2

[0058] LiTFSI and various 1,2-dialkoxyethanes were mixed in ratios of various molar ratios. Table 2 shows the composition of the non-aqueous electrolytic solution which is liquid at normal temperature. Various nonaqueous electrolytic solutions prepared were stored at 60° C. for 10 days in the same manner as in Example 1, and changes in color tone after storage were investigated.

[0059] Table 2

[0060] color change

DEE / LiTFSI=0.75 / 1

none

(DME+DEE) / LiTFSI=(0.5+0.5) / 1

none

(DME+ETFEE) / LiTFSI=(0.5+0.5) / 1

none

(DME+BTFEE) / LiTFSI=(0.6+0.4) / 1

none

(EME+DEE) / LiTFSI=(0.2+0.8) / 1

none

DEE / LiTFSI=1 / 1

none

(DEE+MTFEE) / LiTFSI=(0.8+0.2) / 1

none

(DEE+ETFEE) / LiTFSI=(0.5+0.5) / 1

none

(DEE+BTFEE) / LiTFSI=(0.7+0.3) / 1

none

DME / LiTFSI=2 / 1

none

DEE / LiTFSI=2 / 1

none

DPE / LiTFSI=2 / 1

none ...

Embodiment 3

[0066] In the non-aqueous electrolytic solution of the present invention, whether lithium ions can be intercalated into the graphite material was investigated as follows.

[0067] Artificial graphite powder (MAG-D manufactured by Hitachi Chemical Co., Ltd.) can be used as the negative electrode active material for intercalating / deintercalating lithium ions by charging and discharging.

[0068] The negative electrode plate was produced by the following method. First, 75 parts by mass of artificial graphite powder, 20 parts by mass of acetylene black as a conductive agent, 5 parts by mass of polyvinylidene fluoride resin as a binder, and dehydrated N-methyl-2-pyrrolidone as a dispersion solvent to mix. Next, the mixture was coated on one surface of a 20 μm thick copper foil current collector and dried to form an 80 μm thick active material layer. Then, the copper foil current collector formed with the active material layer was cut into a size of 35 mm × 35 mm, and a copper cur...

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Abstract

A nonaqueous electrolyte solution being liquid at normal temperature, comprising (A) 1,2-dialkoxyethane represented by Formula: R-O-CH 2 -CH 2 -O-R' (wherein, R and R', which are same or different from each other, independently represent an unsubstituted or fluorine-substituted alkyl group having a carbon number of 3 or less) and (B) lithium bis[trifluoromethanesulfonyl]imide at a molar ratio [(A) / (B)] of 0.75 or more and 2 or less.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution used for an electric double layer capacitor, a secondary battery, and the like, an electrochemical energy storage device using the nonaqueous electrolytic solution, and a nonaqueous electrolytic solution secondary battery. Background technique [0002] An electric double layer capacitor using polarized electrodes for the positive and negative electrodes stores electrochemical energy by adsorbing cations and anions in the non-aqueous electrolyte on the surface of the electrodes during charging. For this reason, the internal resistance of the electric double layer capacitor increases due to the decrease in ion concentration in the non-aqueous electrolyte during charging. In addition, if a non-aqueous electrolytic solution with a low ion concentration is used, the number of ions that can be adsorbed decreases, and thus the stored capacitance of the electric double layer capacitor decrease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01B1/06H01G9/038H01M6/16H01G11/58H01G11/60H01G11/62H01M4/133H01M10/0525H01M10/0567H01M10/0569H01M10/36
CPCH01G11/58Y02E60/122H01M6/168H01B1/122H01G9/035H01G11/62H01G9/038H01M2300/0025H01M10/0525H01M10/0567H01G11/60H01M10/0569Y02E60/13H01M4/133Y02E60/10H01M10/0566H01M10/05
Inventor 松井彻出口正树芳泽浩司
Owner PANASONIC CORP
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