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Alloy negative electrode for lithium battery and process for production thereof, and lithium battery

A technology of alloy negative electrode and manufacturing method, which is applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of difficult industrialized mass production, deterioration of discharge capacity, and fragility of Li-Al alloys, and achieve full cycle life and capacity. High density and excellent charge-discharge cycle characteristics

Inactive Publication Date: 2013-01-30
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned lithium secondary battery, because the Li-Al alloy used as the negative electrode is fragile, it is difficult to industrialize mass production
[0005] In addition, in the case of increasing the depth of discharge to perform charge and discharge, a large number of charge and discharge cycles will result in a large deterioration of the discharge capacity
For example, when charging and discharging at a depth of discharge of 100%, the cycle life is limited to about tens of cycles

Method used

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  • Alloy negative electrode for lithium battery and process for production thereof, and lithium battery
  • Alloy negative electrode for lithium battery and process for production thereof, and lithium battery
  • Alloy negative electrode for lithium battery and process for production thereof, and lithium battery

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Embodiment approach 1

[0074] A. Alloy negative electrode for lithium battery

[0075] In the alloy negative electrode for a lithium battery in the present embodiment, the aluminum porous body is filled with lithium metal, and the skeleton of the aluminum porous body is formed of aluminum. And, the alloy negative electrode for lithium battery in the present embodiment is manufactured by the following manufacturing method (refer to Figure 1A~Figure 1C ).

[0076] B. Manufacturing method of alloy negative electrode for lithium battery

[0077] The porous resin 1 can use a foamed resin or non-woven fabric with interconnected pores, particularly preferably a resin with a porosity of 80% to 98% and a pore diameter of about 50 μm to 500 μm, preferably foamed polyurethane.

[0078] Hereinafter, a method for manufacturing an alloy negative electrode for a lithium battery will be described in the order of the aluminum layer forming step, the aluminum porous body manufacturing step, and the lithium metal i...

Embodiment approach 2

[0091] In Embodiment 2, the skeleton of the aluminum porous body is an aluminum coating material in which an aluminum layer is formed on the surface of the core material. In addition, the core material is made of any one of copper, nickel, and iron, and is formed by coating carbon powder on the surface of a resin having through holes, conducts conductive treatment, and then performs plating with a predetermined thickness.

[0092] In Embodiment 2, an alloy negative electrode for a lithium battery and a lithium battery are produced in the same manner as in Embodiment 1, except that the skeleton of the aluminum porous body is an aluminum coating material.

Embodiment approach 3

[0094] In each of the above-mentioned embodiments, the incorporation of lithium metal is not limited to penetration into the pores of the aluminum porous body, and may be formed on the surface of the aluminum porous body.

[0095] In addition, lithium metal does not have to be a single substance, and may be an alloy with other metals, and Li-Si (silicon) and Li-Sn (tin) are particularly suitable as an alloy negative electrode.

[0096] In the case of forming such a Li-Si or Li-Sn alloy negative electrode on an aluminum porous body, an alloy layer of Li and Si or Sn may be formed on the surface of the aluminum porous body, or an alloy layer of Li and Si or Sn may be formed on the "aluminum skeleton" or "formed on An aluminum layer on the surface of a core material such as copper" is formed by providing a Si or Sn metal layer, and further laminating a Li metal layer.

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Abstract

The present invention provides an alloy cathode for lithium battery, its manufacturing method and lithium battery. The alloy cathode for lithium battery is constituted by non-aqueous electrolyte. By filling metal lithium in a porous aluminum body, the skeleton of the porous aluminum body is further formed by using aluminum. Moreover, by forming an aluminum coating material with an aluminum layer on the surface of a core material constituted of any metal selected from the group consisting of copper, nickel and iron, the skeleton of the porous aluminum body is formed to increase the capacity and intensity and provide excellent charging and discharging cycles.

Description

technical field [0001] The present invention relates to an alloy negative electrode for a lithium battery using an aluminum porous body, a method for producing the same, and a lithium battery. Background technique [0002] In recent years, lithium secondary batteries such as lithium ion batteries used in portable information terminals, electric vehicles, and household power storage devices have been actively studied. [0003] As one of the representative examples of this lithium secondary battery, Li-Al (negative electrode) / MnO 2 (positive electrode) lithium secondary battery. [0004] However, in the above-mentioned lithium secondary battery, since the Li-Al alloy used as the negative electrode is fragile, it is difficult to mass-produce it industrially. [0005] In addition, in the case of increasing the depth of discharge to perform charge and discharge, a small number of charge and discharge cycles causes significant deterioration of the discharge capacity. For exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/66H01M4/80
CPCY02E60/12Y02E60/122H01M4/661H01M4/808H01M4/463H01M4/1395H01M4/405H01M4/134Y02E60/10H01M4/66H01M4/80
Inventor 太田进启上村卓细江晃久真岛正利新田耕司
Owner SUMITOMO ELECTRIC IND LTD
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