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Electrolyte solution and battery

An electrolyte and battery technology, applied in the field of electrolyte, can solve the problems of battery characteristics such as the reduction of charging and discharging efficiency, and achieve the effects of improving battery characteristics, reducing reactivity, and preventing decomposition reactions

Active Publication Date: 2008-02-13
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, there is a problem that when lithium hexafluorophosphate or the like is decomposed to generate free acid such as hydrofluoric acid (HF), cobalt or manganese is washed out from the positive electrode, and the electrolyte is decomposed, so battery characteristics such as charge and discharge efficiency decrease

Method used

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  • Electrolyte solution and battery
  • Electrolyte solution and battery
  • Electrolyte solution and battery

Examples

Experimental program
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Effect test

no. 1 approach

[0029] FIG. 1 shows an example of an exploded structure of a secondary battery according to a first embodiment of the present invention. The secondary battery is a so-called lithium ion secondary battery in which the capacity of the negative electrode is expressed by a capacity component due to intercalation and deintercalation of lithium as an electrode reactant. This secondary battery has a structure in which a spirally wound electrode body 20 to which a positive electrode lead 11 and a negative electrode lead 12 are connected is contained inside a film-like packaging member 31 .

[0030] The positive electrode lead 11 and the negative electrode lead 12 are, for example, strip-shaped, and are respectively drawn from the inside to the outside of the packaging member 31 in the same direction, for example. The cathode lead 11 is made of, for example, a metal material such as aluminum (Al). The negative electrode lead 12 is made of a metal material such as nickel (Ni).

[0031...

no. 2 approach

[0112] The secondary battery according to the second embodiment of the present invention is a secondary battery in which the negative electrode capacity includes a capacity component due to intercalation and deintercalation of lithium as an electrode reactant and a capacity component due to deposition and dissolution of lithium, and from which and express.

[0113] The secondary battery has a structure and effect similar to that of the secondary battery according to the first embodiment except that the structure of the negative electrode active material layer is different, and can be similarly manufactured. Therefore, a description is given here with reference to FIG. 1 and FIG. 2 by using the same symbols. Detailed descriptions for the same components will be omitted.

[0114] In the negative electrode active material layer 22B, for example, by setting the charging capacity of the negative electrode material capable of intercalating and extracting lithium to a value smaller ...

Embodiment 1-1 to 1-13

[0123] A battery in which the negative electrode capacity is expressed by a capacity component due to intercalation and deintercalation of lithium, a so-called lithium ion secondary battery, is manufactured.

[0124] First, lithium cobaltate (LiCoO 2 ), graphite as an electrical conductor, and polyvinylidene fluoride as a binder were mixed to prepare a positive electrode mixture. Subsequently, the cathode mixture was dispersed in N-methyl-2-pyrrolidone as a solvent to obtain a cathode mixture slurry. After that, the cathode current collector 21A made of aluminum foil was uniformly coated with the cathode mixture slurry, which was dried and compression molded by a roll press to form the cathode active material layer 21B and thus the cathode 21 . After that, the positive electrode lead 11 was attached to the positive electrode current collector 21A.

[0125] In addition, artificial graphite as an anode active material and polyvinylidene fluoride as a binder were mixed to prepa...

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Abstract

Disclosed is an electrolyte solution which enables to improve battery characteristics such as battery swelling and charge / discharge efficiency. Also disclosed is a battery using such an electrolyte solution. Specifically disclosed is a battery wherein a positive electrode (21) and a negative electrode (22) are arranged in layers via an electrolyte layer (24). The electrolyte layer (24) is a gel containing an electrolyte solution and a polymer compound, and the electrolyte solution contains a compound having a proton-collecting function such as hexamethylenetetramine or hexaethylenetetramine. Consequently, a free acid such as hydrofluoric acid can be captured, thereby suppressing decomposition reaction of the electrolyte.

Description

technical field [0001] The present invention relates to an electrolytic solution and a battery using the same. Background technique [0002] In recent years, miniaturization and weight reduction of portable electronic devices typified by mobile phones, PDAs (Personal Digital Assistants), and notebook personal computers have been actively promoted. As a part thereof, there has been a strong demand for an improvement in the energy density of a battery as its driving power source, particularly a secondary battery. As a secondary battery capable of providing high energy density, for example, a lithium ion secondary battery using a material capable of inserting and extracting lithium (Li) such as a carbon material for a negative electrode is known. [0003] In addition, in recent years, as a secondary battery capable of providing high energy density, a secondary battery has been developed in which a material capable of inserting and extracting lithium is used for the negative el...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M6/16H01M4/02H01M4/58H01M2/02
CPCY02E60/122Y02E60/10
Inventor 市桥明狩野严大郎津田果林木村史子
Owner MURATA MFG CO LTD
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