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Nonaqueous electrolyte for rechargeable battery, and rechargeable battery with nonaqueous electrolyte

A non-aqueous electrolyte and non-aqueous electrolyte technology, which is applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., and can solve problems such as high resistance and reduced discharge load characteristics

Inactive Publication Date: 2010-02-17
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] However, when the above-mentioned compounds are contained in the electrolytic solution, although the effect of improving the storage characteristics and cycle characteristics is obtained to a certain extent, since a film with high resistance is formed on the negative electrode side, there is a problem that the discharge load characteristics especially decrease. question

Method used

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  • Nonaqueous electrolyte for rechargeable battery, and rechargeable battery with nonaqueous electrolyte
  • Nonaqueous electrolyte for rechargeable battery, and rechargeable battery with nonaqueous electrolyte
  • Nonaqueous electrolyte for rechargeable battery, and rechargeable battery with nonaqueous electrolyte

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preparation example Construction

[1023]

[1024] The non-aqueous electrolytic solution 4 of the present invention is prepared by dissolving an electrolyte, a cyclic sulfone compound, a "compound having a viscosity coefficient at 25°C of 1.5 mPa·s or less", a specific compound, and optionally added "other compounds" . When preparing the non-aqueous electrolytic solution 4, it is preferable to dehydrate each raw material in advance in order to reduce the water content when preparing the electrolytic solution. Usually, it can be dehydrated to 50 ppm or less, preferably 30 ppm or less, particularly preferably 10 ppm or less. In addition, dehydration, deacidification treatment, etc. may be performed after preparing the electrolytic solution.

[1025] In a nonaqueous electrolyte battery, the nonaqueous electrolyte solution 4 of the present invention is preferably used as an electrolyte solution for secondary battery applications, such as lithium secondary battery applications. Next, the non-aqueous electrolyte ...

Embodiment approach 5-1

[1043] The non-aqueous electrolytic solution 5 of the present invention contains a lithium salt and a non-aqueous organic solvent in which the lithium salt is dissolved. The non-aqueous organic solvent contains a cyclic polyamine compound and / or a cyclic polyamide compound, and further contains at least one compound selected from unsaturated carbonates, fluorine-containing carbonates, monofluorophosphates, and difluorophosphates . Let this be "Embodiment 5-1".

[1044] [1. Cyclic polyamine compound]

[1045] [1-1. Type]

[1046] The cyclic polyamine compound contained in the non-aqueous electrolytic solution 5 of the present invention (hereinafter, appropriately referred to as "the cyclic polyamine compound of the present invention 5") is a cyclic compound having a structure in which amines are condensed and derivatives thereof. thing. That is, a cyclic compound in which a plurality of nitrogen atoms are bonded via an alkylene group, and a derivative in which a hydrogen at...

Embodiment approach 5-2

[1136] In addition, another gist of the present invention 5 is a non-aqueous electrolytic solution containing a lithium salt and a non-aqueous organic solvent in which the lithium salt is dissolved, wherein the non-aqueous organic solvent contains a cyclic polyamine compound and is The liquid contains 5 to 40% by mass of cyclic carbonate. Let this be "Embodiment 5-2".

[1137] [1. Cyclic polyamine compound]

[1138] [1-1. Type]

[1139] Same as above.

[1140] [1-2. Composition]

[1141] Same as above.

[1142] [2. Cyclic carbonate]

[1143] The cyclic carbonate referred to in the present invention 5 is not particularly limited as long as it is a cyclic carbonate, and part or all of its hydrogen atoms may be replaced by halogens such as fluorine and chlorine. To give examples, ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, difluoroethylene carbonate, fluoropropylene carbonate, trifluoromethylethylene carbonate, etc. . The cyclic ...

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Abstract

This invention provides a nonaqueous electrolyte which is excellent in discharge load properties, as well as in high-temperature storage stability, cycling characteristics, high capacitance, continuous charge properties, storage stability, gas evolution suppression in continuous charging, charge / discharge properties at a high current density, discharge load properties and the like, and a rechargeable battery with a nonaqueous electrolyte. The nonaqueous electrolyte contains a monofluorophosphate and / or a difluorophosphate and further contains a compound having a specific chemical structure orspecific properties.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution for a secondary battery and a secondary battery using the nonaqueous electrolytic solution. Specifically, the present invention relates to a nonaqueous electrolytic solution for a lithium secondary battery containing a specific component and a nonaqueous electrolytic solution using the lithium secondary battery. Background technique [0002] <Non-aqueous electrolyte solution 1, non-aqueous electrolyte secondary battery 1> corresponds to claims 1-8, 13, 14, 39-41 [0003] In recent years, with the miniaturization of electronic equipment, the demand for higher capacity of secondary batteries has been increasing, and lithium secondary batteries (non-aqueous electrolyte secondary batteries) with higher energy density than nickel-cadmium batteries and nickel-metal hydride batteries have attracted attention . [0004] As the electrolyte solution of lithium secondary battery, what has...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/0567H01M10/052H01M10/0569
CPCY02E60/12Y02E60/122H01M4/134H01M4/587H01M10/0525H01M10/0567H01M10/0569H01M2300/0025Y02E60/10Y02P70/50
Inventor 德田浩之藤井隆古田土稔竹原雅裕大贯正道大桥洋一木下信一
Owner MITSUBISHI CHEM CORP
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