Positive electrode active material for electrochemical device, positive electrode for electrochemical device, electrochemical device, and method for producing positive electrode active material for electrochemical device

A positive active material, electrochemical technology, applied in the field of electrochemical equipment, can solve problems such as voltage reduction, and achieve the effect of excellent balance of characteristics

Active Publication Date: 2022-03-15
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, polyaniline has a large capacity density, and it is expected to be used as a positive electrode material, but there is a problem that the voltage drops significantly due to large current discharge

Method used

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  • Positive electrode active material for electrochemical device, positive electrode for electrochemical device, electrochemical device, and method for producing positive electrode active material for electrochemical device
  • Positive electrode active material for electrochemical device, positive electrode for electrochemical device, electrochemical device, and method for producing positive electrode active material for electrochemical device
  • Positive electrode active material for electrochemical device, positive electrode for electrochemical device, electrochemical device, and method for producing positive electrode active material for electrochemical device

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Experimental program
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Effect test

no. 1 approach

[0034] The positive electrode active material contained in the positive electrode material layer according to this embodiment is fibrous or granular, and has: an inner core, which contains the first conductive polymer and is fibrous or granular; and a surface layer, which Covering at least a part of the inner core, the surface layer includes a second conductive polymer different from the first conductive polymer, and the capacity density of the second conductive polymer is greater than that of the first conductive polymer. Accordingly, the positive electrode material layer of the present embodiment easily exhibits a high capacity. Conductive polymers undergo faradaic reactions with the adsorption (doping) and desorption (dedoping) of anions. Therefore, from the viewpoint of obtaining high capacity, it is preferable to use the interface with the non-aqueous electrolyte where the utilization rate becomes high. Conductive polymers with high capacity density are arranged in the vi...

no. 2 approach

[0038] The positive electrode active material contained in the positive electrode material layer according to this embodiment is fibrous or granular, and has: an inner core, which contains the first conductive polymer and is fibrous or granular; and a surface layer, which Covering at least a part of the inner core, the surface layer includes a second conductive polymer different from the first conductive polymer, and the elastic modulus of the second conductive polymer is greater than that of the first conductive polymer. Thus, the positive electrode material layer of the present embodiment exhibits the characteristics of the first conductive polymer and exhibits the excellent durability of the second conductive polymer. The greater the specific surface area (surface area per unit volume) of the inner core, the greater the capacitance of the positive electrode material layer, and the greater the specific surface area of ​​the inner core, the more favorable the output characteri...

no. 3 approach

[0041] The positive electrode active material contained in the positive electrode material layer according to this embodiment is fibrous or granular, and has: an inner core, which contains the first conductive polymer and is fibrous or granular; and a surface layer, which Covering at least a part of the inner core, the surface layer includes a second conductive polymer different from the first conductive polymer, the first conductive polymer is a π-electron conjugated polymer containing nitrogen atoms, and the second conductive polymer The polymer is a π-electron conjugated polymer containing a sulfur atom.

[0042] A π-electron conjugated polymer containing nitrogen atoms tends to form an inner core with a large specific surface area, but on the other hand, tends to have low heat resistance. If a conductive polymer with low heat resistance is used for the positive electrode material layer, capacity degradation will occur in a high-temperature environment. Such capacity deter...

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Abstract

A fibrous or granular positive electrode active material for electrochemical devices, the positive active material includes: an inner core, which contains a first conductive polymer and is fibrous or granular; and a surface layer, which covers the inner core At least a part of the surface layer portion includes a second conductive polymer different from the first conductive polymer. The positive electrode for an electrochemical device has a positive electrode current collector and a positive electrode material layer carried on the positive electrode current collector. By making the positive electrode material layer contain the above positive electrode active material, an electrochemical device with high capacity, high output, and excellent balance of characteristics can be provided.

Description

technical field [0001] The present invention relates to an electrochemical device provided with a positive electrode containing a conductive polymer. Background technique [0002] In recent years, attention has been paid to electrochemical devices having intermediate performance between lithium ion secondary batteries and electric double layer capacitors. For example, studies have been conducted on the use of conductive polymers as positive electrode materials (see Patent Document 1). The positive electrode containing conductive polymers undergoes Faradaic reaction with the adsorption (doping) and desorption (dedoping) of anions, so the reaction resistance is small, and it has a higher output than the positive electrode of a general lithium-ion secondary battery . [0003] Polyaniline, polypyrrole, and the like are known as conductive polymers, and it has been proposed to use them in combination to realize a positive electrode having respective characteristics. For example...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01G11/06H01G11/48H01G11/86H01M4/1399H01M4/36H01M10/052H01M10/0566H01M50/534
CPCH01G11/06H01G11/48H01G11/86H01M4/1399H01M4/364H01M4/606H01M4/608H01G11/24H01G11/28H01M4/0466H01M4/137Y02E60/10H01M50/534H01M50/44H01M50/4295H01M4/1393H01M4/583H01M4/661H01M10/0525H01M2004/021H01M2004/027H01M2004/028
Inventor 林宏树松村菜穗伊藤靖幸野本进安久津诚远藤东吾
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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