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ELECTRODE PROVIDED WITH ALLOY LAYER OF MAGNESIUM AND BISMUTH, AND MAGNESIUM SECONDARY BATTERY

Foreign code F190009695
File No. (H28-055),S2017-0470-C0
Posted date Jan 23, 2019
Country WIPO
International application number 2018JP010207
International publication number WO 2018168995
Date of international filing Mar 15, 2018
Date of international publication Sep 20, 2018
Priority data
  • P2017-051226 (Mar 16, 2017) JP
Title ELECTRODE PROVIDED WITH ALLOY LAYER OF MAGNESIUM AND BISMUTH, AND MAGNESIUM SECONDARY BATTERY
Abstract The present invention addresses the problem of providing: an electrode which enables the production of a magnesium secondary battery that is suppressed in the formation of an oxide coating, while having high potential and high capacity; and a magnesium secondary battery which is suppressed in the formation of an oxide coating, while having high potential and high capacity. An electrode which is characterized by containing a solid solution (Mg1-xBix, wherein x is 0.001-0.0112) of magnesium (Mg) and bismuth (Bi) or by containing a solid solution (Mg1-xBix, wherein x is 0.001-0.0112) of magnesium (Mg) and bismuth (Bi) and an intermetallic compound (Mg3Bi2) of magnesium (Mg) and bismuth (Bi). A magnesium secondary battery that is characterized by being provided with this electrode, which serves as a negative electrode, while being additionally provided with an electrolyte layer and a positive electrode.
Outline of related art and contending technology BACKGROUND ART
In recent years, lithium-ion secondary battery as a secondary battery in practical use, electronic device or the like used in various applications.However, for future use and a large on-vehicle applications, the corresponding lithium ion secondary battery is difficult, the development of other secondary batteries has been performed.Therefore, the electric capacity per unit volume of the lithium ion secondary battery of the magnesium secondary battery having a characteristic over the development are performed.Magnesium is, the electric capacity per unit volume is about 2 times as well as lithium, the lithium melting point of 650°C compared to 186°C high.Is a lithium ion secondary battery, such as a short circuit in the battery by heating, firing and a problem is pointed out that, as one reason for this is the melting point of lithium and low respectively.In this regard, a high melting point than that of the lithium-magnesium, high safety.Further, magnesium, a rare metal and lithium are present on the earth, rich in terms of resources.However, the conventional magnesium negative electrode, the surface of the insulating layer for forming the oxide film, and prevents electricity increases the overvoltage, the battery capacity characteristics of the original problem and may not be exhibited.
Therefore, in order to solve the above-described problems have been made some proposals.For example, by improving the electrolyte as a method of formation of the oxide film, is used as the negative electrode electrolyte EtMgBr/THF of the surface of the magnesium oxide film has been proposed a method of removing the (non-patent document 1).However, in this method, not resistant to the potential of the oxidation side, resulting in decomposition of the electrolyte solution for a long time for charging and discharging of the problem of the inability.In addition, the positive electrode material is limited and can be used, the potential of the battery voltage as low as 1V does not only report.As a method for improving the negative electrode, a negative electrode an intermetallic compound of magnesium has been proposed a method used, the molar ratio of bismuth and magnesium was 3:2 prepared intermetallic compound can be used has been proposed (Patent Document 1, Non-Patent Document 2).However in this method, magnesium-bismuth intermetallic compounds, magnesium content 16 mass % on the order of a small amount of magnesium can be used.Further, the intermetallic compound is brittle, it is a problem in the durability for use as an electrode.In order to improve the durability, the binder is used and requires the addition of the conductive auxiliary agent, binder and conductive auxiliary agent and takes into account the weight, a content of magnesium is about 13% further decreases.Therefore, the magnesium battery in the electrochemical energy per the contribution of the problem is small.
Scope of claims (In Japanese)請求の範囲 [請求項1]
マグネシウム(Mg)とビスマス(Bi)との合金層を備える電極であって、前記合金層が、マグネシウム(Mg)とビスマス(Bi)との固溶体(Mg 1-xBi x;ただし、xは0.001~0.0112)を含む、又はマグネシウム(Mg)とビスマス(Bi)との固溶体(Mg 1-xBi x;ただし、xは0.001~0.0112)とマグネシウム(Mg)とビスマス(Bi)との金属間化合物(Mg 3Bi 2)を含むことを特徴とする電極。

[請求項2]
マグネシウム(Mg)とビスマス(Bi)との合金中のビスマスの含有量が、前記合金全体に対して1~58.9質量%であることを特徴とする請求項1記載の電極。

[請求項3]
負極として請求項1又は2記載の電極を備え、さらに電解質層及び正極を備えることを特徴とするマグネシウム二次電池。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • YAMAGUCHI UNIVERSITY
  • TOBATA SEISAKUSHO CO., LTD.
  • Inventor
  • YOSHIMOTO, Nobuko
  • YAMABUKI, Kazuhiro
  • ITAOKA, Kanae
  • FUJII, Kentaro
  • MATSUMOTO, Toshiharu
IPC(International Patent Classification)

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