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Nonaqueous electrolyte solution and nonaqueous electrolyte secondary battery using same

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of battery capacity reduction, battery material degradation, safety reduction, etc. The effect of excellent gas generation and cycle characteristics

Active Publication Date: 2015-04-29
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If a non-aqueous electrolyte secondary battery such as a lithium-ion secondary battery is repeatedly charged and discharged, the electrolyte will decompose on the electrode or the material constituting the battery will deteriorate, and the capacity of the battery will decrease.
In addition, depending on the situation, there is a possibility that the battery may expand and the safety against fire, explosion, etc. may be reduced.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A-1

[0470] Under a dry argon atmosphere, ethylene carbonate (EC) as a cyclic carbonate, dimethyl carbonate (DMC) as a chain carbonate, and ethyl methyl carbonate (EMC) as EC:DMC:EMC=30 : 30:40 volume ratio, add fully dried LiPF so that it becomes 1.0 mol / L 6 (The resulting mixture is referred to as "reference electrolyte"). With respect to the whole reference electrolytic solution, methacrylic anhydride was added so that it might become 0.5 mass %, and vinylene carbonate (VC) would be added so that it might become 1 mass %, and the non-aqueous electrolytic solution was prepared.

Embodiment 1A-2～1A-8

[0471] [Examples 1A-2 to 1A-8, Comparative Examples 1A-1 to 1A-8, Reference Examples 1A-1 to 1A-11]

[0472] A reference electrolyte solution was prepared in the same manner as in Example 1A-1, and the compounds listed in Table 1 below were added in proportion to the entire obtained reference electrolyte solution to prepare each non-aqueous electrolyte solution. Among them, Comparative Example 1A-1 is the reference electrolyte solution itself.

[0473]

[0474] In 98 parts by mass of graphite powder as the negative active material, add 1 part by mass of the aqueous dispersion of carboxymethylcellulose sodium and 1 part by mass of the aqueous dispersion of styrene-butadiene rubber as thickener and binding agent , mixed with a disperser to make a slurry. The obtained slurry was applied to one surface of a copper foil, dried, and pressurized, and the negative electrode was cut into circular shapes with a diameter of 12.5 mm and used. The prepared negative electrode was used a...

Embodiment 2A-1～2A-5、 comparative example 2A-1～2A-7

[0491] [Examples 2A-1 to 2A-5, Comparative Examples 2A-1 to 2A-7, Reference Examples 2A-1 to 2A-6]

[0492] A reference electrolyte solution was prepared in the same manner as in Example 1A-1, and the compounds described in the following Table 2 were added in proportion to the entire obtained reference electrolyte solution to prepare each non-aqueous electrolyte solution, and a coin-type battery was produced. Table 2 shows the results of the initial charge-discharge efficiency (%) obtained by (initial discharge capacity / initial charge capacity)×100. In addition, the examples, comparative examples, and reference examples described in Table 2 all used the same reference electrolyte solution as in Table 1.

[0493] [Table 2]

[0494] Table 2

[0495]

[0496] In Comparative Example 2A-2 using methacrylic anhydride, which is a compound represented by formula (1), the initial charge-discharge efficiency decreased compared with Comparative Example 2A-1 using only the standard ele...

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Abstract

The objective of the present invention is to provide: a nonaqueous electrolyte solution which improves cycle characteristics and load characteristics, while suppressing the generation of a gas; and a nonaqueous electrolyte secondary battery which uses this nonaqueous electrolyte solution. The present invention relates to a nonaqueous electrolyte solution which is used in a nonaqueous electrolyte secondary battery that is provided with a positive electrode and a negative electrode that have active materials capable of absorbing and desorbing metal ions. This nonaqueous electrolyte solution contains a compound represented by general formula (1), and additionally contains a specific amount of a carboxylic acid or at least one compound that is selected from the group of specific compounds such as a cyclic carbonate compound having an unsaturated bond.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a nonaqueous electrolytic solution secondary battery using the nonaqueous electrolytic solution. Background technique [0002] With the rapid progress of electronic equipment, the demand for higher capacity of secondary batteries continues to increase. Compared with nickel-cadmium batteries and nickel-hydrogen batteries, non-aqueous electrolyte batteries such as lithium-ion secondary batteries with high energy density are favored. Widely used and actively researched. [0003] The electrolyte solution used in the non-aqueous electrolyte battery is usually mainly composed of an electrolyte and a non-aqueous solvent. As the electrolyte solution of lithium-ion secondary batteries, LiPF 6 、LiBF 4 , LiN(CF 3 SO 2 ) 2 Non-aqueous electrolyte solution obtained by dissolving electrolyte such as ethylene carbonate, propylene carbonate and other high dielectric constant solvents and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCC08K5/09C08K5/156H01M10/052H01M10/0567H01M10/0569Y02E60/10H01M4/13H01M4/133H01M4/36H01M4/587H01M10/0525H01M2300/0025H01M2300/0028
Inventor 大桥洋一古田土稔
Owner MITSUBISHI CHEM CORP
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