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Nonaqueous electrolyte solution and nonaqueous electrolyte battery using same

a technology of nonaqueous electrolyte and electrolyte battery, which is applied in the direction of batteries, cell components, electrochemical generators, etc., can solve the problems of increasing the internal resistance of the battery, reducing the battery capacity, and undergoing conventionally known capacity declines, so as to improve the high-temperature storage characteristics and cycle characteristics of the battery, and favorable overall balance of battery performan

Inactive Publication Date: 2015-12-17
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a lithium nonaqueous electrolyte secondary battery that exhibits good overall balance of battery performance with respect to durability, capacity, resistance, and output characteristics. The invention addresses the problem of limited effects of previous compounds in improving high-temperature storage, cycle, and rate characteristics. The invention includes a compound containing a specific structure and a cyclic carbonate compound containing a fluorine atom in a specific amount. The combination of these compounds improves high-temperature storage, cycle, and rate characteristics.

Problems solved by technology

In addition, lithium ion secondary batteries have conventionally been known to undergo a decrease in capacity when repeatedly charged and discharged, an increase in battery internal resistance when stored under high-temperature conditions while in the charged state, deterioration such as a decrease in battery capacity, or in the worst possible scenario, have the potential for being extremely dangerous due to rupturing or ignition of the battery due to a runaway reaction within the battery per se, and various studies have also been conducted on nonaqueous solvents and electrolytes in order to rectify this situation.

Method used

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  • Nonaqueous electrolyte solution and nonaqueous electrolyte battery using same
  • Nonaqueous electrolyte solution and nonaqueous electrolyte battery using same
  • Nonaqueous electrolyte solution and nonaqueous electrolyte battery using same

Examples

Experimental program
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first embodiment

I. First Embodiment

[0056]1. Nonaqueous Electrolyte Solution

[0057]1-1. Nonaqueous Electrolyte Solution of Present Invention

[0058]The nonaqueous electrolyte solution of the present invention contains a compound containing a structure represented by the following general formula (A), and at least one compound selected from the group consisting of a nitrile compound, an isocyanate compound, a difluorophosphate, a fluorosulfonate, a lithium bis(fluorosulfonyl)imide and a compound represented by the following general formula (B).

[0059]1-1-1. Compound Having Structure Represented by General Formula (A)

[0060]In formula (A), R1 to R3 may be mutually the same or different and are optionally substituted organic groups having 1 to 20 carbon atoms.

[0061]Here, an organic group represents a functional group composed of atoms selected from the group consisting of carbon atoms, hydrogen atoms, nitrogen atoms, oxygen atoms and halogen atoms. Specific examples thereof include an alkyl group, alkenyl g...

second embodiment

II. Second Embodiment

[0476]3. Nonaqueous Electrolyte Solution

[0477]The nonaqueous electrolyte solution of the present invention contains an electrolyte and a nonaqueous solvent that dissolves the electrolyte in the same manner as an ordinary nonaqueous electrolyte solution, and is characterized in that it contains a compound represented by the aforementioned general formula (1).

[0478]3-1. Compound Represented by General Formula (1)

[0479]The nonaqueous electrolyte solution of the present invention is characterized in that it contains a compound represented by the following general formula (1).

[0480]In the above formula, X1 and X2 independently represent NR8, NR8R9 or CR8R9, and R7 to R9 respectively and independently represent a hydrogen atom, fluorine atom, alkyl group, alkenyl group, alkynyl group or aryl group, and at least one of R7 to R9 represents a group having a cyano group and may be mutually the same or different. An alkyl group or alkenyl group is preferable, and an alkyl ...

examples

[0711]Although the following provides a more detailed explanation of the present invention by indicating examples and comparative examples, the present invention is not limited to these examples. Examples and comparative examples based on the first embodiment of the present invention are indicated below.

[0712]Compounds used in the present examples that contain a structure represented by general formula (A) are indicated below.

[0713]At least one type of compound selected from the group consisting of (1) nitrile compounds, isocyanate compounds, difluorophosphates, fluorosulfonates, lithium bis(fluorosulfonyl)imides and compound represented by general formula (B) used in the present examples are indicated below.

[0714](2) The cyclic carbonate compound having a fluorine atom used in the present examples is shown below.

[0715]Assistants (acid anhydride compounds: maleic anhydride, succinic anhydride, cyclic carbonate having a carbon-carbon unsaturated bond: vinylene carbonate) used in the ...

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Abstract

A nonaqueous electrolyte solution for a secondary battery that inhibits increases in resistance during high-temperature storage in a charged state and decreases in capacity, as well as a secondary battery that uses this lithium nonaqueous electrolyte solution. A lithium nonaqueous electrolyte secondary battery that incorporates this non-aqeuous electrolyte solution and that demonstrates a favorable overall balance of battery performance with respect to performance such as durability, capacity, resistance and output characteristics.

Description

TECHNICAL FIELD[0001]The present invention relates to a nonaqueous electrolyte solution and a nonaqueous electrolyte battery using the same.BACKGROUND ART[0002]Accompanying the rapid progress made in the area of cell phones, laptop personal computers and other portable electronic devices, there is a growing demand for batteries used as the main and backup power supplies thereof to demonstrate higher capacities, and nonaqueous electrolyte batteries such as lithium ion secondary batteries are attracting attention for such applications since they demonstrate higher energy density in comparison with nickel-cadmium batteries or nickel-hydrogen batteries.[0003]Typical examples of the electrolyte solution of lithium ion secondary batteries include nonaqueous electrolyte solutions obtained by dissolving an electrolyte, such as LiPF6, LiBF4, LiN(CF3SO2)2 or LiCF3(CF2)3SO3, in a mixed solvent consisting of a solvent having a high dielectric constant, such as ethylene carbonate or propylene ca...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/0567H01M10/0525H01M4/36H01M4/583H01M4/38
CPCH01M10/0567H01M4/583H01M4/386H01M2220/30H01M4/364H01M10/0525H01M2300/0025H01M4/387H01M4/587H01M10/052Y02E60/10
Inventor NAKAZAWA, EIJIOOHASHI, YOICHIKOTATO, MINORUMITSUI, TAKAMICHIAOSHIMA, TAKAYUKINAKAMURA, TAKESHI
Owner MITSUBISHI CHEM CORP
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