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Nonaqueous electrolyte solution for battery and nonaqueous electrolyte battery using same

A non-aqueous electrolyte and battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, lithium batteries, etc., can solve the problems of insufficient non-combustibility, slow reduction and decomposition, and deterioration of battery characteristics such as cycle characteristics, and achieve the purpose of suppressing Effect of fire hazard and safety improvement

Inactive Publication Date: 2007-04-04
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general phosphoric acid triesters mentioned above have insufficient incombustibility and are slowly reduced and decomposed at the negative electrode due to repeated charging and discharging, so there is a problem that battery characteristics such as cycle characteristics are seriously deteriorated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 10% by volume of methoxydifluorophosphine oxide [O=PF 2 (OCH 3 )] mixed with 90% by volume ethylene carbonate (EC) / ethyl methyl carbonate (EMC) mixed solution (EC / EMC volume ratio=3 / 7), and then dissolved LiPF 6 Make its concentration reach 1mol / L, prepare non-aqueous electrolyte. The limit oxygen index (limit oxygen index) of the obtained non-aqueous electrolytic solution was measured according to the following method (1), and the results shown in Table 1 were obtained.

[0039] (1) The limiting oxygen index of the electrolyte

[0040] The limiting oxygen index of the electrolytic solution was measured in accordance with JIS K 7201. The larger the limiting oxygen index, the more difficult it is for the electrolyte to burn. Specifically, by reinforcing the 127mm×12.7mm SiO with U-shaped aluminum foil 2 Thin slice (quartz filter paper, non-combustible), make it a self-supporting body, and then impregnate 1.0ml of the aforementioned electrolyte in the SiO 2 A test p...

Embodiment 2

[0049] In addition to using 10% by volume of aminodifluorophosphine oxide [O=PF 2 NH 2 ] In place of the methoxydifluorophosphine oxyphosphine used in the preparation of the non-aqueous electrolytic solution of Example 1, the non-aqueous electrolytic solution was prepared in the same manner as in Example 1, and the limiting oxygen concentration of the non-aqueous electrolytic solution obtained was measured. In addition, a non-aqueous electrolyte solution secondary battery was fabricated in the same manner as in Example 1, and cycle characteristics and low-temperature characteristics were respectively evaluated. The results are shown in Table 1.

Embodiment 3

[0051] In addition to 10% by volume diaminophosphine oxyfluoro[O=PF(NH 2 ) 2 ] to replace the methoxydifluorophosphine oxyphosphine used in the preparation of the non-aqueous electrolyte of Example 1, prepare the non-aqueous electrolyte in the same manner as in Example 1, and measure the limiting oxygen concentration of the non-aqueous electrolyte obtained. In addition, a non-aqueous electrolyte solution secondary battery was fabricated in the same manner as in Example 1, and cycle characteristics and low-temperature characteristics were respectively evaluated. The results are shown in Table 1.

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PUM

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Abstract

This invention relates to a non-aqueous electrolyte for a battery having an excellent safety and a non-aqueous electrolyte battery comprising such a non-aqueous electrolyte and having a high safety, and more particularly to a non-aqueous electrolyte for a battery comprising a phosphine oxide compound having P-F bond and / or P-NH 2 bond in its molecule and a support salt, as well as a non-aqueous electrolyte battery comprising such a non-aqueous electrolyte for the battery, a positive electrode and a negative electrode.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution for batteries and a nonaqueous electrolytic solution battery using the nonaqueous electrolytic solution, in particular to a nonaqueous electrolytic solution for batteries and a nonaqueous electrolytic solution battery with excellent safety. Background technique [0002] In recent years, as the main power supply or auxiliary power supply of electric vehicles and fuel cell vehicles, or as the power supply of small electronic devices, it is desired to obtain batteries that are lightweight, have a long life, and have high energy density. In response to this demand, since the electrode potential of lithium is the lowest among metals and the capacitance per unit volume is large, non-aqueous electrolyte batteries using lithium as the negative electrode active material have become one of the batteries with high energy density. Various batteries such as primary batteries and secondary batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/052H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 堀川泰郎江口真一大月正珠
Owner BRIDGESTONE CORP