Nonaqueous electrolytic solution for electrochemical energy devices

A non-aqueous electrolysis and electrochemical technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, electrochemical generators, etc., can solve problems such as increased battery pressure, deterioration of battery performance, and adverse effects on device performance.

Inactive Publication Date: 2007-07-04
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent publication, it is disclosed that CF 3 CF 2 CH 2 OCF 2 CF 2 H is used as an example of a specific compound, but its boiling point is 68 ° C. Since it does not have a high enough boiling point, it will adversely affect the performance of the device at high temperatures, such as an increase in the internal pressure of the battery due to solvent evaporation, thus Deterioration of battery performance

Method used

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  • Nonaqueous electrolytic solution for electrochemical energy devices
  • Nonaqueous electrolytic solution for electrochemical energy devices
  • Nonaqueous electrolytic solution for electrochemical energy devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0070] The present invention will be described in more detail through the following exemplary embodiments.

[0071] In Examples and Comparative Examples, the following compounds are sometimes represented by symbols in parentheses or chemical formulas.

[0072] Aprotic solvents:

[0073] Ethylene carbonate (EC)

[0074] Propylene carbonate (PC)

[0075] Diethyl carbonate (DEC)

[0076] Ethyl Methyl Carbonate (EMC)

[0077] Dimethoxyethane (DME)

[0078] Gamma-butyrolactone (GBL)

[0079] Tetrahydrofuran (THF)

[0080] Fluorinated ethers:

[0081] C 2 f 5 CF(CF(CF 3 ) 2 )-OCH 3 (HFE1) (boiling point: 98°C)

[0082] C 2 f 5 CF(CF(CF 3 ) 2 )-OC 2 h 5 (HFE2) (boiling point: 104°C)

[0083] CF 3 CFHCF 2 OC 2 h 4 OCF 2 CFHCF 3 (HFE3) (boiling point: 164°C)

[0084] CF 3 CFHCF 2 OC 3 h 6 OCF 2 CFHCF 3 (HFE4) (boiling point: 188°C)

[0085] CH 3 -O-C 6 f 12 -O-CH 3 (HFE5) (boiling point: 166°C)

[0086] H-C 6 f 12 -CH 2 -O-CH 3 (HFE6) (boiling...

Embodiment A1～A20 and comparative example A1～A3

[0104] Prepare non-aqueous electrolytic solutions with the compositions shown in Table 1 at 25° C., and observe the appearance of the solutions.

[0105] In Examples A1-A14, the non-aqueous electrolytic solution was prepared by dissolving the supporting electrolyte in the non-aqueous mixed solvent containing the fluorinated ether of the present invention and the aprotic solvent, and tested, and a transparent and uniform solution was obtained.

[0106] In Examples A15-A20, the non-aqueous electrolytic solution further added with perfluoroketones or perfluorocarbons was tested, and a transparent and uniform solution was obtained as a result.

[0107] In comparative examples A1-A3, instead of adding the fluorinated ether of the present invention, perfluoroketones and perfluorocarbons were added, and the non-aqueous electrolytic solutions prepared therefrom were tested, and the solution was stratified.

[0108] non-aqueous solvent

Aprotic solvent 1 (vol%)

...

Embodiment A21～A64

[0113] In the compatibility test, various solvent compositions using various electrolytes shown in Tables A2 to A4 were further tested.

[0114] non-aqueous solvent

Aprotic solvent 1 (vol%)

Aprotic solvent 2 (vol%)

Fluorinated ethers of the present invention

(vol%)

Other solvents (vol%)

Supporting electrolyte (concentration)

(note)

Solution Appearance

Example A21

EC(18)

DEC(72)

HFE1(10)

BETI (1mol / L)

Transparent and uniform

Example A22

EC(16)

DEC(64)

HFE1(20)

BETI (1mol / L)

Transparent and uniform

Example A23

EC(30)

DEC(60)

HFE1(10)

BETI (1mol / L)

Transparent and uniform

Example A24

EC(40)

DEC(55)

HFE1(5)

BETI (1mol / L)

Transparent and uniform

Example A25

EC(10)

DEC(80)

HFE1(10)

LiPF 6 (1mol / L)

Transparent and uniform

Example A26

EC(20)

DEC(75)

HFE1(5)

...

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Abstract

A non-aqueous mixed solvent for use in a non-aqueous electrolytic solution for electrochemical energy devices which can enhance the high current charging and discharging capacity and low-temperature charging and discharging capacity of an electrochemical energy device, and prevent the device from damage at high temperatures. The solvent comprises an aprotic solvent and at least one fluorinated ether having a boiling point of 80 DEG C or more and being represented by R1-O-Rf1 (formula 1), R2-O-(Rf2-O)n-R3 (formula 2) or Rfh1-O-A-O-Rfh2 (formula 3). Also electrolytic solutions comprising such solvents and electrochemical energy devices containing such electrolytic solutions.

Description

field of invention [0001] The invention relates to a non-aqueous electrolytic solution for an electrochemical energy device. Background technique [0002] Electrochemical energy devices have been manufactured in various capacities. Examples of devices in which the charging and discharging voltage of the unit cell is greater than 1.5 V include lithium primary batteries, lithium secondary batteries, lithium ion secondary batteries, lithium ion gel polymer batteries (commonly called lithium polymer batteries, sometimes called Lithium-ion polymer batteries) and high-voltage double-layer capacitors (those charged at a voltage greater than 1.5V). Water cannot be used as a solvent for the electrolytic solution in such high-voltage electrochemical energy devices because the electrolysis of water leads to the generation of hydrogen and oxygen. Therefore, a nonaqueous electrolytic solution obtained by dissolving a supporting electrolyte in an aprotic solvent such as an alkyl carbona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16H01M10/40H01G9/02H01G11/54H01G11/14H01G11/60H01G11/62H01M10/05H01M10/0566H01M10/0568H01M10/0569
CPCH01M6/166H01M10/0568H01M10/0569H01M10/0567H01M10/052Y02E60/13Y02E60/12H01G9/038H01M2300/0037H01G9/022Y02T10/7011Y02T10/7022H01G11/60H01M6/164Y02E60/10H01G11/62H01M6/16
Inventor 濑川晴贵
Owner 3M INNOVATIVE PROPERTIES CO
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