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MarketScreener Homepage  >  Equities  >  Tokyo  >  Zeon Corp    4205   JP3725400000

ZEON CORP

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“Binder Composition For All-Solid-State Battery, Slurry Composition For All-Solid-State Battery, Electrode For All-Solid-State Battery, And All-Solid-State Battery” in Patent Application Approval Process (USPTO 20190229339): Zeon Corporation

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08/14/2019 | 05:31pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Japan Daily Report -- A patent application by the inventors MAEDA, Kouichirou (Chiyoda-ku, Tokyo, Japan); OGURO, Hiroki (Chiyoda-ku, Tokyo, Japan), filed on September 5, 2017, was made available online on July 25, 2019, according to news reporting originating from Washington, D.C., by NewsRx correspondents.

This patent application is assigned to Zeon Corporation (Chiyoda-ku, Tokyo, Japan).

The following quote was obtained by the news editors from the background information supplied by the inventors: “Demand for batteries such as lithium ion batteries has been increasing in recent years for various applications such as mobile information terminals, mobile electronic devices, and other mobile terminals, and also domestic small power storage devices, electric motorcycles, electric vehicles, and hybrid electric vehicles.

“The widespread use of batteries in such applications has been accompanied by demand for further improvement of battery safety. Examples of effective methods for ensuring battery safety include preventing leakage of organic electrolyte solution containing an electrolyte dissolved in an organic solvent. On the other hand, techniques for producing batteries that include a solid electrolyte layer instead of a flammable organic electrolyte solution and in which all battery members are in a solid form (all-solid-state batteries) have been investigated.

“Specifically, an all-solid-state battery generally includes a solid electrolyte layer as an electrolyte layer between a positive electrode and a negative electrode. The solid electrolyte layer may, for example, be a polymeric solid electrolyte layer or an inorganic solid electrolyte layer. As one example of a polymeric solid electrolyte layer, PTL 1 describes a solid electrolyte layer that is formed through shaping of a composition obtained by adding an electrolyte salt to polyethylene oxide or the like. On the other hand, as one example of an inorganic solid electrolyte layer, PTL 2 describes a solid electrolyte layer obtained through press forming of a powder of a specific three-component glassy solid electrolyte. An all-solid-state battery including an inorganic solid electrolyte layer, in particular, is extremely safe compared to a battery in which an organic electrolyte solution is used. For reasons such as described above, the development of highly safe all-solid-state batteries including inorganic solid electrolyte layers has been progressing, particularly in recent years.

“In production of an all-solid-state battery, it is normally the case that a binder is used. The binder may be used, for example, in a solid electrolyte layer or in an electrode active material layer of an electrode including the electrode active material layer on a current collector in order to bind components such as solid electrolyte particles and an electrode active material, and thereby prevent detachment of these components from a battery member such as an electrode.

“PTL 3 and PTL 4 describe all-solid-state lithium secondary batteries in which a solid electrolyte layer is formed by a method (application method) in which a slurry composition for a solid electrolyte layer that contains solid electrolyte particles and a solvent is applied onto a positive electrode or a negative electrode, and is then dried. In an electrode or solid electrolyte layer obtained through application of a slurry composition and subsequent drying of solvent, a binder such as described above is an important factor in expression of characteristics as a battery.”

In addition to the background information obtained for this patent application, NewsRx journalists also obtained the inventors’ summary information for this patent application: “Technical Problem

“Studies carried out by the inventors have revealed that there are cases in which the all-solid-state lithium secondary batteries described in PTL 3 and 4 have inadequate capacity characteristics as a result of insufficient ion conductivity within a solid electrolyte layer or within an electrode active material layer.

“Accordingly, an objective of the present disclosure is to provide a binder composition for an all-solid-state battery, a slurry composition for an all-solid-state battery, and an electrode for an all-solid-state battery with which an all-solid-state battery having excellent capacity characteristics can be obtained, and also to provide an all-solid-state battery having excellent capacity characteristics.

“Solution to Problem

“As a result of diligent investigation, the inventors discovered that the objective set forth above can be achieved using a binder composition that contains a copolymer having a specific chemical composition and an iodine value within a specific range as a binder and that contains an organic solvent having a boiling point that is a specific temperature or higher as a solvent. In this manner, the inventors completed the present disclosure.

“Specifically, the present disclosure provides the following.

“[1] A binder composition for an all-solid-state battery comprising:

“a copolymer including a nitrile group-containing monomer unit with a percentage content of at least 10 mass % and not more than 30 mass % and an alkylene structural unit, and having an iodine value of at least 40 mg/100 mg and not more than 130 mg/100 mg; and

“an organic solvent having a boiling point of 100.degree. C. or higher.

“[2] The binder composition for an all-solid-state battery according to the foregoing [1], wherein the organic solvent having a boiling point of 100.degree. C. or higher is at least one of xylene and toluene.

“[3] A slurry composition for an all-solid-state battery comprising:

“the binder composition for an all-solid-state battery according to the foregoing [1] or [2]; and

“solid electrolyte particles.

“[4] The slurry composition for an all-solid-state battery according to the foregoing [3], further comprising an electrode active material.

“[5] An electrode for an all-solid-state battery comprising an electrode active material layer formed from the slurry composition for an all-solid-state battery according to the foregoing [4].

“[6] An all-solid-state battery comprising the electrode for an all-solid-state battery according to the foregoing [5].

“Advantageous Effect

“According to the present disclosure, it is possible to provide a binder composition for an all-solid-state battery, a slurry composition for an all-solid-state battery, and an electrode for an all-solid-state battery with which an all-solid-state battery having excellent capacity characteristics can be obtained, and also to provide an all-solid-state battery having excellent capacity characteristics.”

The claims supplied by the inventors are:

“1. A binder composition for an all-solid-state battery comprising: a copolymer including a nitrile group-containing monomer unit with a percentage content of at least 10 mass % and not more than 30 mass % and an alkylene structural unit, and having an iodine value of at least 40 mg/100 mg and not more than 130 mg/100 mg; and an organic solvent having a boiling point of 100.degree. C. or higher.

“2. The binder composition for an all-solid-state battery according to claim 1, wherein the organic solvent having a boiling point of 100.degree. C. or higher is at least one of xylene and toluene.

“3. A slurry composition for an all-solid-state battery comprising: the binder composition for an all-solid-state battery according to claim 1; and solid electrolyte particles.

“4. The slurry composition for an all-solid-state battery according to claim 3, further comprising an electrode active material.

“5. An electrode for an all-solid-state battery comprising an electrode active material layer formed from the slurry composition for an all-solid-state battery according to claim 4.

“6. An all-solid-state battery comprising the electrode for an all-solid-state battery according to claim 5.”

URL and more information on this patent application, see: MAEDA, Kouichirou; OGURO, Hiroki. Binder Composition For All-Solid-State Battery, Slurry Composition For All-Solid-State Battery, Electrode For All-Solid-State Battery, And All-Solid-State Battery. Filed September 5, 2017 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190229339%22.PGNR.&OS=DN/20190229339&RS=DN/20190229339

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Japan Daily Report, source Geographic Newsletters

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