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Electrode and battery using it

An electrode and battery technology, applied in the field of electrodes, can solve problems such as battery capacity reduction

Active Publication Date: 2005-10-05
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, due to charge and discharge, the reaction with the electrolyte causes a decrease in battery capacity

Method used

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  • Electrode and battery using it
  • Electrode and battery using it
  • Electrode and battery using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 and 1-2

[0075] First, a 4 μm thick active material layer 12 made of silicon was formed on a current collector 11 made of a 20 μm thick copper foil by electron beam evaporation. Next, a 200 μm-thick thin film layer 13 made of nickel or copper was formed on the active material layer 12 by electron beam evaporation. Electrodes 10 of Examples 1-1 and 1-2 were thus formed. The thicknesses of the active material layer 12 and the thin film layer 13 were examined by SEM (scanning electron microscope).

[0076] Next step, utilize the electrode 10 that embodiment 1-1 and 1-2 form, make Figure 4 A coin-type secondary battery with a diameter of 20 mm and a thickness of 16 mm is shown. In the weight ratio of lithium cobaltate: carbon black: polyvinylidene fluoride = 92:3:5, active material lithium cobaltate (LiCoO 2 ) powder, conductive substance carbon black and binder polyvinylidene fluoride; the mixture is poured into the liquid carrier N-methylpyrrolidone to make a mixture slurry; the mixt...

Embodiment 2-1 to 2-4

[0082]The electrode 10 is manufactured by forming the active material layer 12 by a sintering method. Specifically, first, a 20 μm thick copper foil or titanium foil is prepared as the current collector 11 . Then, a mixture slurry was prepared by adding N-methylpyrrolidone to a mixture obtained by mixing silicon powder having an average particle diameter of 1 μm and polyvinylidene fluoride at a weight ratio of 9:1. The mixture slurry is coated on the current collector 11 and heated to volatilize N-methylpyrrolidone. Next, the product was pressurized, and heat-treated and sintered at 300° C. for 8 hours in an argon atmosphere to form active material layer 12 . After forming the active material layer 12, on the surface of the active material layer 12, a 200 μm thick film layer 13 made of copper or a 200 μm thick film layer 13 made of nickel was formed by electron beam evaporation. Thus, the electrode 10 was produced. The thickness of the thin film layer 13 was examined by SEM...

Embodiment 3-1 to 3-6

[0089] As Examples 3-1 to 3-6 and Comparative Example 3, electrodes 10 were formed in a similar manner to Example 1-1 except that the active material layer 12 made of germanium was formed by electron beam evaporation to a thickness of 4 μm, And the thickness of the film layer 13 was changed as shown in Table 3. The thicknesses of the active material layer 12 and the thin film layer 13 were examined by SEM.

[0090] Then, by using the electrodes manufactured in Examples 3-1 to 3-6 and Comparative Example 3, Figure 5 and 6 secondary battery shown. Electrode 70 is formed like electrode 40 . The electrolyte layer 90 is formed by coating the precursor solution on the electrode 10 and the electrode 70 respectively, keeping the product at room temperature for 8 hours, and volatilizing dimethyl carbonate, wherein the precursor solution is mixed with 10 wt% of Block copolymer polyvinylidene fluoride and 60wt% dimethyl carbonate, and dissolve it in 30wt% of 42.5wt% ethylene carbona...

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Abstract

An electrode and a battery using the same are provided to improve cycle properties by reducing damages in the structure of active materials caused by repeated expansion-and-shrinkage upon charge and discharge processes and also reducing the reactivity with electrolyte. The electrode comprises: a current collector comprising at least one selected from Cu, Ni, Ti, Fe and Cr; a layer of an active material mounted on the current collector, which comprises at least on selected from Si and Ge compounds; a film layer mounted on the active material layer, which comprises at least one Cu and Ni.

Description

Background of the invention [0001] field of invention [0002] The present invention relates to an electrode including a current collector and an active material layer and a battery using the electrode. [0003] current technology [0004] In recent years, mobile devices have become sophisticated and multifunctional. Accompanying these circumstances, high-capacity secondary batteries are required as power sources for these mobile devices. As a secondary battery that meets such needs, there is a lithium ion secondary battery. However, in the case of using a typical lithium secondary battery, which uses lithium cobalt oxide as the negative electrode and graphite as the positive electrode, the battery capacity is in a saturated state, and it is difficult to achieve a high capacity. Therefore, metal lithium (Li) has been considered as a positive electrode since a long time ago. However, in order to put the positive electrode into practical use, it is necessary to increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/02H01M4/66H01M4/04H01M10/40H01M4/134H01M4/1395H01M4/38H01M10/05H01M10/052
CPCH01M4/0404H01M4/38H01M4/134H01M4/1395H01M4/0471Y02E60/122H01M10/052H01M4/366H01M4/661H01M4/386Y02E60/10Y02P70/50A01G9/023
Inventor 川瀬贤一高田智雄宫木幸夫
Owner MURATA MFG CO LTD
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