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Electrolyte for non-aqueous electrolyte battery, and non-aqueous electrolyte battery using same

A non-aqueous electrolyte and electrolyte technology, applied in non-aqueous electrolyte storage batteries, non-aqueous electrolytes, batteries, etc., can solve problems such as reduction in electric capacity, and achieve excellent low-temperature characteristics, improved residual rate, and excellent balance.

Active Publication Date: 2015-02-25
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Japanese Patent Laying-Open No. 2005-032714 (Patent Document 1) proposes to suppress the internal resistance of the battery by adding lithium difluorobis(oxalato)phosphate and lithium difluorooxalatoborate to the non-aqueous electrolyte solution. However, compared with the non-aqueous electrolyte battery without adding the above-mentioned compound, there is a tendency for the initial capacity to decrease
For non-aqueous electrolyte batteries, regardless of the use in small equipment or large equipment, it is not preferable to reduce the initial capacity from the viewpoint of increasing the capacity.

Method used

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  • Electrolyte for non-aqueous electrolyte battery, and non-aqueous electrolyte battery using same
  • Electrolyte for non-aqueous electrolyte battery, and non-aqueous electrolyte battery using same
  • Electrolyte for non-aqueous electrolyte battery, and non-aqueous electrolyte battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0078] Use a mixed solvent of ethylene carbonate and ethyl methyl carbonate as a non-aqueous solvent at a volume ratio of 1:2, and dissolve LiPF as a solute in the solvent 6 1.0mol / L, 0.01% by mass of lithium difluorobis(oxalato)phosphate as the 1st compound, 11% by mass of the aforementioned compound No.11 as the 2nd compound, as shown in Table 1, prepare electrolytic solution for non-aqueous electrolyte battery liquid. It should be noted that the above preparation is carried out while maintaining the temperature of the electrolyte at 25°C. The free acid concentration in the electrolytic solution 1 hour after the above preparation was 54 mass ppm, and the free acid concentration in the electrolytic solution 24 hours after the preparation was 2 mass ppm. It should be noted that the measurement of free acid is carried out by titration.

[0079] Using this electrolyte, the LiCoO 2 Using graphite as the positive electrode material and graphite as the negative electrode materia...

Embodiment 1-2～1-37

[0097] The types and addition amounts of the first compound and the second compound in the aforementioned Example 1-1 were respectively changed to prepare an electrolyte solution for a non-aqueous electrolyte battery. Using this non-aqueous electrolytic solution, a battery cell was produced in the same manner as in Example 1-1, and battery evaluation was performed. Table 1 shows the preparation conditions of the nonaqueous electrolytic solution and the concentrations of free acids in the electrolytic solution after 1 hour and 24 hours after preparation, and Table 2 shows the evaluation results of batteries using the electrolytic solution. It should be noted that, compared with the battery cells of Examples 1-1 to 1-13, it was confirmed that the laminated battery cells of Examples 1-15 and 1-16 after the cycle test had larger swelling, and the gas inside the battery The production volume is relatively large. Compared with the battery cell of Comparative Example 1-1, the batter...

Embodiment 1-38～1-43

[0102] [Examples 1-38 to 1-43, Comparative Examples 1-7 to 1-10]

[0103] Change the negative pole body that uses among the embodiment 1-1, use non-aqueous electrolytic solution No.1-8,1-20,1-32,1-38 or 1-42 as non-aqueous electrolytic solution battery electrolytic solution, and implement In Example 1-1, the battery's initial capacity, cycle characteristics, internal resistance characteristics, and low-temperature characteristics were evaluated in the same manner. It should be noted that the active material in the negative electrode is Li 4 Ti 5 o 12 In Examples 1-38 to 1-40 and Comparative Examples 1-7 to 1-8, the negative electrode bodies were produced as follows: at 90% by mass Li 4 Ti 5 o 12 5% by mass of polyvinylidene fluoride (PVDF) as a binder and 5% by mass of acetylene black as a conductive agent were added to the powder, N-methylpyrrolidone was further added, and the resulting paste was applied on a copper foil. It was made to dry and it produced, and the end-...

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Abstract

Provided is an electrolyte for a non-aqueous electrolyte battery comprising at least one compound selected from the group consisting of lithium difluoro(bis(oxalato))phosphate, lithium tetrafluoro(oxalato)phosphate, and lithium difluoro(oxalato)borate as a first compound, and at least one of the siloxane compounds represented by formulas (1) and (2) as a second compound. The electrolyte exhibits improved initial characteristics and superior storage stability and low-temperature characteristics, and yields a battery that demonstrates excellent, well-balanced overall performance.

Description

technical field [0001] The present invention relates to an electrolyte solution for a nonaqueous electrolyte battery constituting a nonaqueous electrolyte secondary battery having a large initial capacity and excellent cycle characteristics and low-temperature characteristics, and a nonaqueous electrolyte battery using the same. Background technique [0002] In recent years, power storage systems for information-related equipment or communication equipment, such as computers, video cameras, digital cameras, mobile phones and other small equipment that require high energy density, or auxiliary power supplies for electric vehicles, hybrid vehicles, and fuel cell vehicles, Power storage systems, which are large-scale equipment such as power storage, and require power use, are attracting attention. As one of the candidates, nonaqueous electrolyte batteries such as lithium ion batteries, lithium batteries, and lithium ion capacitors have been vigorously developed. [0003] Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/0568H01M10/0569
CPCH01M10/0567Y02E60/122H01M2300/0025Y02T10/7011H01M10/0568H01M10/052H01M10/0569Y02E60/10Y02T10/70H01M2220/20H01M2220/30H01M2300/0037
Inventor 近藤夕季久保诚森中孝敬山本建太
Owner CENT GLASS CO LTD
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