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Anode material, anode and battery

A negative electrode material and negative electrode technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of reduced energy density, large oxide ratio, thick film thickness, etc., to prevent the reduction of volumetric energy density, high Effect of capacity, smooth insertion and withdrawal

Active Publication Date: 2007-07-04
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned technology, there is such a problem that the ratio of the oxide is large, and the thickness of the film is thick, so that the energy density per volume decreases

Method used

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  • Anode material, anode and battery
  • Anode material, anode and battery
  • Anode material, anode and battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] The anode material according to the first embodiment of the present invention includes an active portion containing at least one of silicon and tin as constituent elements and a covering portion of a metal oxide arranged on a part of the surface of the active portion. It is because silicon and tin have a high ability to insert and extract lithium, and high energy density can be obtained. Also, because the chemical stability of the negative electrode material can be improved when the covering portion is included. In addition, since the negative electrode material has an exposed portion in which no covering portion is arranged on a part of the surface of the active portion, lithium or the like can be inserted and extracted smoothly.

[0024] Examples of the above active portion include a simple substance, alloy or compound of silicon, a simple substance, alloy or compound of tin, and a material containing one or two or more phases at least partially containing them. The ...

no. 2 approach

[0074] The secondary battery according to the second embodiment of the present invention has the same structure, function and effect as the first embodiment except that the structures of the negative electrodes 22 and 34 are different, so the secondary battery can be manufactured in the same manner. Therefore, in this embodiment, referring to FIGS. 1 , 2 , 3 and 4 , the same components are denoted by the same numerals as those in the first embodiment, and no further description will be given.

[0075] As in the case of the first embodiment, the negative electrodes 22 and 34 have a structure in which the negative electrode active material layers 22B and 34B are arranged on both faces of the negative electrode current collectors 22A and 34A, respectively, and the negative electrode active material layers 22B and 34B each include a negative electrode material, The negative electrode material includes an active part comprising at least one constituent element of silicon and tin and...

Embodiment 1-1 to 1-8

[0081] A coin-type secondary battery shown in FIG. 5 was formed. The two electrodes are formed by laminating the positive electrode 51 and the negative electrode 52 with the separator 53 impregnated with the electrolytic solution to form a laminate, sandwiching the laminate between the package case 54 and the package cover 55 , and then gap filling by the gasket 56. secondary battery.

[0082] First, after an active portion was formed on the anode current collector 52A formed of a copper foil having a thickness of 10 μm by an electron beam evaporation method, the anode current collector 52A was punched into a sheet having a diameter of 16 mm.

[0083] Then, in Examples 1-1 to 1-5, the negative electrode current collector 52A on which silicon was deposited was immersed in a solution obtained by dissolving boric acid as a fluorine anion trapping agent in hexafluorotitanic acid as a fluorine metal complex. In a solvent formed in ammonium to deposit titanium oxide (TiO 2 ), thereb...

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Abstract

An anode material capable of obtaining a high capacity and superior charge-discharge efficiency, and an anode and a battery using the anode material are provided. An anode includes an anode material including an active portion including at least one of silicon and tin as an element and a coating portion of a metal oxide arranged on a part of a surface of the active portion. The ratio of the coating portion to the active portion is within a range from 0.01 wt % to 10 wt % inclusive. Thereby, a high capacity and superior charge-discharge efficiency can be obtained.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP2005-334162 filed in the Japan Patent Office on Nov. 18, 2005, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to an anode material including at least one of silicon (Si) and tin (Sn) as constituent elements, and an anode and a battery using the anode material. Background technique [0004] In recent years, a large number of portable electronic devices such as camcorders, digital still cameras, mobile phones, personal digital assistants, and laptop computers have appeared, and attempts have been made to reduce their size and weight. Therefore, the development of lightweight secondary batteries capable of obtaining higher energy density has been promoted. Among those batteries, a lithium ion secondary battery using a carbon material as a negative electrode, a com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/02H01M10/40H01M4/134H01M4/36H01M6/16H01M10/05H01M10/0525H01M10/0566H01M10/0569
CPCY02E60/122H01M4/485H01M4/134H01M10/0569H01M4/131H01M10/0587H01M4/38H01M4/386H01M4/387Y02E60/10Y02P70/50H01M4/48H01M4/58H01M10/02
Inventor 山口裕之
Owner MURATA MFG CO LTD
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