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

外国特許コード F190009695
整理番号 S2017-0470-C0
掲載日 2019年1月23日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP010207
国際公開番号 WO 2018168995
国際出願日 平成30年3月15日(2018.3.15)
国際公開日 平成30年9月20日(2018.9.20)
優先権データ
  • 特願2017-051226 (2017.3.16) JP
発明の名称 (英語) ELECTRODE PROVIDED WITH ALLOY LAYER OF MAGNESIUM AND BISMUTH, AND MAGNESIUM SECONDARY BATTERY
発明の概要(英語) 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.
従来技術、競合技術の概要(英語) 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.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • YAMAGUCHI UNIVERSITY
  • TOBATA SEISAKUSHO CO., LTD.
  • 発明者(英語)
  • YOSHIMOTO, Nobuko
  • YAMABUKI, Kazuhiro
  • ITAOKA, Kanae
  • FUJII, Kentaro
  • MATSUMOTO, Toshiharu
国際特許分類(IPC)

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