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Power storage device electrode, method for manufacturing the same, power storage device, and electronic device

a technology of power storage device and electrode, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, cell components, etc., can solve the problems of deterioration gradually, the reaction potential of the negative electrode of a lithium-ion secondary battery and a lithium-ion capacitor is out of the potential windows of almost all electrolytic solutions, and cannot be said that such a surface film is sufficiently stable, etc., to achieve high adhesion, reduce irreversible capacity, and high reliability

Inactive Publication Date: 2015-04-23
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a new power storage device that has several technical effects. Firstly, it is highly reliable and has a long lifetime. Secondly, it reduces or inhibits the decomposition reaction of the electrolytic solution on the surface of the electrode, which improves the cycle characteristics of the device. Thirdly, it prevents a decrease in charge and discharge capacity in high-temperature charging and discharging, which extends the operating temperature range of the device. Lastly, it provides a novel electrode and a novel power storage device.

Problems solved by technology

However, reaction potentials of the negative electrodes of a lithium-ion secondary battery and a lithium-ion capacitor are out of the potential windows of almost all electrolytic solutions.
However, at the same time as battery reaction, the electrolytic solution is gradually decomposed and a surface film is formed due to the decomposition product, and thus, deterioration gradually proceeds.
Therefore, it cannot be said that such a surface film is sufficiently stable.
In addition, the formation of the surface film causes irreversible capacity, resulting in a partial loss of charge and discharge capacity.
Further, the surface film has extremely small electric conductivity, which lowers the electric conductivity of an electrode while a battery is charged and discharged.
Consequently, the charge and discharge capacity of the battery is low, and the cycle life of the battery is short due to local charge and discharge.
Therefore, as in the negative electrode, irreversible capacity is caused in the positive electrode, resulting in a decrease in charge and discharge capacity.

Method used

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  • Power storage device electrode, method for manufacturing the same, power storage device, and electronic device
  • Power storage device electrode, method for manufacturing the same, power storage device, and electronic device
  • Power storage device electrode, method for manufacturing the same, power storage device, and electronic device

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0058]In this embodiment, a layer for increasing adhesion is provided between a current collector and an active material layer. In addition, a coating film is formed on an active material with the use of perhydropolysilazane.

[0059]With the use of perhydropolysilazane, a coating film can be formed on a surface of an active material in a power storage device electrode. Such a coating film can inhibit reaction between the active material and an electrolytic solution and reduce irreversible capacity.

[0060]When a coating film is formed on a surface of an active material of a power storage device electrode with the use of perhydropolysilazane and a binder having a carboxyl group (—COOH) is used, a porous coating film can be formed as a result of interaction between the carboxyl group and perhydropolysilazane. An electrode including this porous coating film has better cycle characteristics.

[0061]“The coating film is porous” means that the coating film has a number of pores on its surface o...

embodiment 2

[0144]In this embodiment, the structures of power storage devices including the electrode described in Embodiment 1 will be described with reference to FIGS. 11A to 11C, FIGS. 12A and 12B, FIGS. 13A and 13B, and FIGS. 14A to 14E. Structural examples of power storage devices (storage batteries) will be described with reference to FIGS. 15A and 15B, FIGS. 16A1, 16A2, 16B1, and 16B2, FIGS. 17A and 17B, FIGS. 18A and 18B, and FIG. 19. Examples of electronic devices will be described with reference to FIGS. 20A and 20B.

(Coin-Type Storage Battery)

[0145]FIG. 11A is an external view of a coin-type (single-layer flat type) storage battery, and FIG. 11B is a cross-sectional view thereof.

[0146]In a coin-type storage battery 300, a positive electrode can 301 doubling as a positive electrode terminal and a negative electrode can 302 doubling as a negative electrode terminal are insulated from each other and sealed by a gasket 303 made of polypropylene or the like. Here, as at least one of a posi...

example 1

[0204]In this example, the electrode described in Embodiment 1 was manufactured and the electrode strength was evaluated. A half cell and a full cell were manufactured using the electrode and their characteristics were evaluated.

(Formation of Electrode)

[0205]As described in Embodiment 1, slurry was prepared to form an electrode.

[0206]Slurry A was prepared in the following manner: acetylene black (the surface area was 63 m2 / g, and the grain diameter was approximately 30 nm) was added to N-methyl-2-pyrrolidone (NMP) including 12 wt % polyvinylidene fluoride (PVdF), and the mixture was stirred and mixed in a mixer at 2000 rpm for 25 minutes. The PVdF was one to which a carboxyl group was added.

[0207]Slurry B was prepared by mixing an aqueous solution of polyarylamine (product name: PAA-15C) and an anchor coat agent (product name: Super Collophite). Polyarylamine is a compound having an amino group. The anchor coat agent contains graphite and water in a weight ratio of 89.5:10.5 (wt %)....

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Abstract

To provide a highly reliable power storage device. To provide a long-life power storage device. To provide a power storage device electrode having high adhesion with a current collector. To reduce or inhibit electrochemical decomposition of an electrolytic solution or the like on a surface of an electrode. The power storage device electrode includes a current collector and a second electrode layer provided over the current collector and including a second binder and an active material. A first electrode layer including a first binder and conductive particles is provided between the current collector and the second electrode layer. At least part of a surface of the active material is provided with a coating film, and the coating film is porous.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an object, a method, or a manufacturing method. In addition, the present invention relates to a process, a machine, manufacture, or a composition of matter. One embodiment of the present invention relates to a semiconductor device, a display device, a light-emitting device, a power storage device, a driving method thereof, and a manufacturing method thereof. In particular, one embodiment of the present invention relates to a power storage device electrode and a method for manufacturing the power storage device electrode.[0003]2. Description of the Related Art[0004]In recent years, various power storage devices such as secondary batteries including lithium-ion secondary batteries and the like, lithium ion capacitors, and air cells have been actively developed. In particular, demand for lithium-ion secondary batteries with high output and high energy density has rapidly grown with the deve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/13H01M10/058H01M4/139H01M10/052H01M4/04H01M4/02
CPCH01M4/13H01M10/052H01M10/058H01M4/139H01M4/0404H01M4/366H01M4/622H01M4/625H01M10/4235Y02E60/10Y02P70/50
Inventor IKENUMA, TATSUYAKURIKI, KAZUTAKA
Owner SEMICON ENERGY LAB CO LTD
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