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Non-aqueous electrolyte for battery and non-aqueous electrolyte battery comprising the same

A non-aqueous electrolyte and battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., to achieve high safety and excellent battery characteristics

Inactive Publication Date: 2008-01-30
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, improvement of decomposition resistance (reduction resistance) and securing of safety (non-combustibility) have recently become more and more important issues as electrolyte solutions, but in this respect, the prior art has not yet reached a sufficiently satisfactory level. level

Method used

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  • Non-aqueous electrolyte for battery and non-aqueous electrolyte battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] From 50% by volume of ethyl difluorophosphate, and 50% by volume of the above-mentioned general formula (I), n is 3, all R 1 Dissolve LiPF in an amount of 1 mol / L in a mixed solvent composed of cyclophosphazene compounds in which one is ethoxy and five are fluorine 6 , 3% by mass of 5-norbornene-2,3-dicarboxylic anhydride was added thereto to prepare a non-aqueous electrolytic solution. Next, the flame retardancy of the obtained non-aqueous electrolytic solution was evaluated by the following method, and the results shown in Table 1 were obtained.

[0061] (1) Evaluation of flame retardancy

[0062] Using the method stipulated in the UL94HB method of the UL (Underwriter Laboratories) standard, the burning length and burning time of the ignited flame were measured and evaluated in the air environment. Specifically, based on the UL test standard, the SiO 21.0 mL of the above electrolytic solution was infiltrated on the sheet, and a test piece was prepared and evaluated...

Embodiment 2

[0075] From 40% by volume of trifluoroethyl difluorophosphate, 20% by volume of the above-mentioned general formula (I), n is 3, all R 1 Among them, 2 are linked by ethylenedioxy, 4 are cyclic phosphazene compounds of fluorine, and 40% by volume of the above general formula (I), n is 4, all R 1 Dissolve LiPF in an amount of 1.2 mol / L in a mixed solvent composed of cyclophosphazene compounds in which one is ethoxy and seven are fluorine 6 , to which 3% by weight of 1,2,3,6-tetrahydrophthalic anhydride was added to prepare a non-aqueous electrolytic solution, and the flame retardancy of the obtained non-aqueous electrolytic solution was evaluated. In addition, a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1, and the cycle characteristics and safety under high voltage conditions were respectively evaluated. The results are shown in Table 1.

Embodiment 3

[0077] From 25% by volume of propyl difluorophosphate, 25% by volume of the above-mentioned general formula (I), n is 3, all R 1 In a mixed solvent composed of 3 methoxyl groups, 3 fluorine cyclic phosphazene compounds, 15% by volume ethylene carbonate, and 35% by volume dimethyl carbonate, dissolve LiPF in an amount of 1mol / L 6 , adding 2% by mass bicyclo[2.2.2]oct-5-ene-2,3-dicarboxylic acid anhydride to it to prepare a non-aqueous electrolyte, and evaluate the flame retardancy of the obtained non-aqueous electrolyte. In addition, a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1, and the cycle characteristics and safety under high voltage conditions were respectively evaluated. The results are shown in Table 1.

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Abstract

The invention provides a nonaqueous electrolytic solution for batteries with high flame retardancy and high reduction resistance. A non-aqueous electrolytic solution for a battery, characterized in that it comprises: a non-aqueous solvent containing a cyclic phosphazene compound represented by the following general formula (I) and a difluorophosphate compound represented by the following general formula (II) , a dicarboxylic acid anhydride compound having a ring structure, and a supporting electrolyte, in the formula (I), R1 independently represents a halogen, an alkoxy group or an aryloxy group; n represents 3 to 4, and in the formula (II), R2 is an alkane radical, cycloalkyl, alkenyl, alkoxy-substituted alkyl or aryl.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution for batteries and a nonaqueous electrolytic solution battery equipped with the same, and relates to a nonaqueous electrolytic solution for batteries with high flame retardancy and a nonaqueous electrolytic solution battery with excellent battery characteristics and high safety. Background technique [0002] Nonaqueous electrolytic solutions are used as electrolytes for lithium batteries, lithium ion secondary batteries, electric double layer capacitors, etc. These devices are widely used as driving power sources for personal computers and mobile phones due to their high voltage and high energy density. In addition, as these non-aqueous electrolytic solutions, LiPF dissolved in aprotic organic solvents such as ester compounds and ether compounds are generally used. 6 and other substances obtained from supporting electrolytes. However, since the aprotic organic solvent is flammable, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16H01M6/14H01M10/40H01M10/00H01M10/0567
CPCY02E60/122H01M2300/0025H01M10/0569H01M10/0525Y02E60/10
Inventor 堀川泰郎
Owner BRIDGESTONE CORP
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