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Secondary battery and electronic device

A secondary battery and electrolyte technology, applied in the direction of secondary batteries, battery electrodes, lithium batteries, etc., can solve the problems that it is difficult to obtain battery cycle characteristics and swelling characteristics, and achieve improved battery characteristics, improved chemical stability, and decomposition reactions inhibitory effect

Active Publication Date: 2011-05-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, it is difficult to obtain battery characteristics such as sufficient cycle characteristics and swelling characteristics
Such a problem is severe in the case where a high-capacity material is used as an anode active material

Method used

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  • Secondary battery and electronic device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0060] A secondary battery according to a first embodiment of the present invention includes an electrolyte, and positive and negative electrodes. The positive electrode contains a positive active material capable of intercalating and deintercalating electrode reactants. The negative electrode contains a negative active material capable of intercalating and deintercalating the electrode reactant. Also, the electrolyte contains a solvent and an electrolyte salt dissolved therein. In particular, at least one of the positive electrode, the negative electrode, and the electrolyte contains the compound shown in formula (1) (hereinafter also referred to as “radical scavenger compound (radical scavenger compound)”). In this case, only one kind of radical scavenging compounds shown in formula (1) may be contained, or two or more kinds thereof may be contained.

[0061] [chemical formula 4]

[0062]

[0063] (x is a (a+b) valence group with free radical capture function, and M is...

no. 2 approach

[0314] In the secondary battery according to the second embodiment of the present invention, at least one of the positive electrode, the negative electrode, and the electrolyte contains the nitrile compound shown in formula (2). In other words, the secondary battery of the present embodiment has a structure similar to that of the first embodiment except that the nitrile compound shown in formula (2) is used instead of the radical scavenging compound shown in formula (1) . In this case, only one kind of compounds shown in formula (2) may be contained, or two or more kinds thereof may be contained.

[0315] [chemical formula 24]

[0316]

[0317] (R1 is a (a1+b1+c1) valence group composed of an element selected from the group consisting of hydrogen, oxygen, and halogen elements and carbon, and M1 is a metal element. a1, d1, f1, and e1 are greater than or equal to 0 Integers. b1 and c1 are integers greater than or equal to 0. Satisfy (b1+c1)≥1.)

[0318] The form of introdu...

no. 3 approach

[0384] The secondary battery according to the third embodiment of the present invention includes a positive electrode, a negative electrode, and an electrolyte, and at least one of the positive electrode and the negative electrode contains one or more of the compounds shown in formula (3). In other words, the secondary battery of the present embodiment has a structure similar to that of the secondary battery in the first embodiment, except that the compound shown in formula (3) is used instead of the radical scavenging compound shown in formula (1) , and the component containing the compound is at least one of a positive electrode and a negative electrode.

[0385] [chemical formula 32]

[0386]

[0387] (R1 is a (a1+b1) valence group including at least one ring of benzene rings and cyclohexane rings in the total number of 2 to 5. X1 and Y1 are hydrogen groups, hydroxyl groups, or represented by -OM1 group. a1 and b1 are integers greater than or equal to 0. M1 is an alkali...

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Abstract

Disclosed is a secondary battery which can be improved in battery properties. The secondary battery comprises: a positive electrode (21) which comprises a positive electrode active material capable of storing and releasing an electrode reactant substance; a negative electrode (22) which comprises a negative electrode active material capable of storing and releasing an electrode reactant substance; and an electrolyte which comprises a solvent and an electrolyte salt. At least one of the positive electrode (21), the negative electrode (22) and the electrolyte contains a radical-scavenging compound. The radical-scavenging compound has a group having a radical-scavenging function as a base structure, and also has at least one carboxylic acid metal salt group or sulfonic acid metal salt group introduced into the aforementioned group. The chemical stability of the positive electrode (21), the negative electrode (22) or the electrolyte which contains the radical-scavenging compound can be improved, and therefore the occurrence of the degradation reaction of the electrolyte during the charge / discharge operation can be prevented readily.

Description

technical field [0001] The present invention relates to a secondary battery including a positive electrode, a negative electrode and an electrolyte, and an electronic device including the secondary battery. Background technique [0002] In recent years, portable electronic devices such as video cameras, digital still cameras, mobile phones, and notebook personal computers have been widely used, and reduction in their size and weight and their long life are strongly demanded. Therefore, as a power source for these portable electronic devices, batteries, particularly, lightweight secondary batteries capable of providing high energy density have been developed. [0003] In particular, secondary batteries utilizing intercalation and deintercalation of lithium ions for charging and discharging reactions (so-called lithium ion secondary batteries) are widely used in practice because such lithium ion secondary batteries can provide Higher energy density of NiCd batteries. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M4/62H01M10/40H01M4/131H01M4/133H01M4/136H01M10/052H01M10/0567
CPCH01M10/0567H01M4/133Y02E60/122H01M10/052H01M4/136H01M4/131Y02E60/10
Inventor 山口裕之齐藤俊介小谷徹井原将之洼田忠彦
Owner MURATA MFG CO LTD
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