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Electrochemical device

An electrochemical and electrode technology, applied in the field of electrochemical devices, can solve the problems of high price and limited lithium resources.

Inactive Publication Date: 2009-02-11
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium secondary batteries have safety issues, and lithium resources are limited and expensive

Method used

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Examples

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Embodiment 1

[0045] Using metal magnesium as the negative electrode active material, cobalt (II) chloride (CoCl 2 ) as the positive active material to manufacture figure 1 A coin-type magnesium secondary battery 10 is shown.

[0046]

[0047] First, a mixture is prepared as follows: cobalt(II) chloride (CoCl 2 , Sigma-AldrichCo. product), to which small particle size graphite was added as a conductive carbon material, and they were thoroughly mixed. Graphite is a product of Timcal Japan Co., Ltd., with a trade name of "KS6", and has an average particle diameter of 6 μm. The mixture contains cobalt(II) chloride and KS6 in a weight ratio of 1:1. This mixture was pressed onto a positive electrode collector grid 5 made of stainless steel (SAS), thereby forming a sheet-like positive electrode 1 .

[0048] In this embodiment, the polymer binder is omitted in order to maximize the energy capacity per unit weight and unit volume of the positive electrode 1 . However, it is desirable to use...

Embodiment 2

[0059] Figure 4 The measured discharge curves of different magnesium secondary batteries 10 prepared using other chlorides as positive electrode active materials are shown. Figure 4 CoCl used in Example 1 is also shown 2 The measured discharge curves are used for comparison. The materials used in this embodiment are CuCl, CuCl 2 、NiCl 2 , FeCl 2 , FeCl 3 , CrCl 2 and MnCl 2 . The materials used in this example are all products of Sigma-Aldrich Co., and the battery was manufactured and measured in the same manner as in Example 1. Figure 4 It shows that a variety of chloride materials can be used as positive electrode active materials for magnesium secondary batteries, among which NiCl with large current capacity is preferred 2 、CoCl 2 , FeCl 2 , CrCl 2 and CuCl 2 .

[0060] Reference (J. Electrochem. Soc., 149, p. 627-634 (2002)) discloses a lithium ion secondary battery using cobalt(II) oxide (CoO) as a positive electrode active material. It is disclosed that...

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Abstract

A positive electrode (1) is formed by pressure bonding a mixture of a positive electrode active material, formed of a halide of at least one metal element selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn, with an electroconductive material such as graphite powder, to a positive electrode current collecting net (5). A negative electrode (2) is formed of a metallic magnesium plate or the like. A separator (3) formed of polyethylene glycol or the like is held between the positive electrode (1) and the negative electrode (2) to avoid direct contact between the positive electrode (1) and the negative electrode (2). An electrolysis solution (4) is filled into a battery chamber (8), and the battery chamber (8) is hermetically sealed with a gasket (9). A solution prepared by dissolving a suitable metal ion-containing salt in an aprotic organic solvent, for example, a solution of Mg(ACl2EtBu)2 in tetrahydrofuran (THF), is used as the electrolysis solution (4). The above constitution can provide an electrochemical device that can satisfactorily bring out excellent properties, as a negative electrode active material, for example, a large energy capacity, possessed by a polyvalent metal such as metallic magnesium.

Description

technical field [0001] The present invention relates to electrochemical devices such as magnesium batteries. Background technique [0002] In recent years, as small electronic devices have become smaller, lighter and more portable, there has been an increasing demand for smaller, lighter and thinner batteries used in such devices. [0003] Since the energy capacity per unit weight of elemental lithium (Li) is greater than that of other elements, there have been a large number of reports on research on lithium secondary batteries. However, lithium secondary batteries have safety problems, and lithium resources are limited and expensive. [0004] In contrast, magnesium resources are abundant and much cheaper than lithium. In addition, metallic magnesium exhibits a large energy capacity per unit volume and is expected to have high safety when used in batteries. Thus, the magnesium secondary battery is a secondary battery capable of making up for the disadvantages of the lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/38H01M4/46H01M6/16H01M10/40H01M4/02H01M4/134H01M4/136H01M10/05H01M10/054H01M10/0565H01M10/0566
CPCY02E60/12H01M10/054Y02E60/122H01M2004/028H01M4/582H01M4/622H01M10/0569H01M4/466H01M10/0568H01M4/38H01M4/623H01M4/381Y02E60/10
Inventor 大木荣干中山有理野田和宏
Owner SONY CORP
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