Lithium ion secondary battery and its manufacture method

A secondary battery, lithium ion technology, used in secondary batteries, electrolyte battery manufacturing, battery pack components, etc. The effect of large capacity, securing adhesive strength and high ionic conductivity

Inactive Publication Date: 2005-08-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if the method disclosed in the above-mentioned U.S. Patent No. 5,437,692 is used, sufficient strength cannot be obtained, and the battery cannot be made thin enough. In addition, the ionic conduction resistance between the ion-conducting layer and the positive electrode and the negative electrode is also high, and the charge-discharge There are also problems in practical use of battery characteristics such as
In addition, according to the above-mentioned WO95 / 15589, since the plastic ion-conducting layer is joined, there is a problem that sufficient strength cannot be obtained, and the battery cannot be made thin enough.

Method used

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  • Lithium ion secondary battery and its manufacture method
  • Lithium ion secondary battery and its manufacture method
  • Lithium ion secondary battery and its manufacture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (production of positive electrode)

[0040] The use of 87 parts by weight LiCoO 2 , 8 parts by weight of graphite powder, 5 parts by weight of polyvinylidene fluoride dispersed in N-methylpyrrolidone (hereinafter referred to as NMP) positive electrode active material paste, coated with a thickness of about 300 microns to form a positive electrode active material film. An aluminum mesh with a thickness of 30 micrometers to be the positive electrode current collector 2 was placed on the top thereof, and a positive electrode active material paste adjusted to a thickness of 300 micrometers was applied again on the top thereof by the doctor blade method. After being left in a dryer at 60° C. for 60 minutes, it became semi-dry to form a laminate of the positive electrode current collector 2 and the positive electrode active material. The positive electrode 1 in which the positive electrode active material layer 3 was formed was produced by rolling the laminated body to a th...

Embodiment 2

[0054] Only the adjustment of the adhesive of the above-mentioned embodiment 1 is changed as follows, and a figure 1 The battery body is shown as a flat laminated structure.

[0055] (adhesive adjustment)

[0056] With the average molecular weight (Mw) being 3.0 parts by weight of poly(acrylonitrile) (produced by Aldric company) of 86200, the average molecular weight (Ww) is 2.0 parts by weight of polyvinylidene fluoride (produced by Aldric company) of 534000, and the NMP of 95 parts by weight The composition ratio is mixed, and it is fully stirred to make it into a uniform solution to make a viscous adhesive.

Embodiment 3

[0058] Only the adjustment of the adhesive of the above-mentioned embodiment 1 is changed as follows, and a figure 1 The battery body is shown as a flat laminated structure.

[0059] (adhesive adjustment)

[0060] With average molecular weight (Mw) being 2.5 parts by weight of polyvinylidene fluoride (produced by Aldric company) of 180000, average molecular weight (Ww) is 2.5 parts by weight of polyvinylidene fluoride (produced by Aldric company) of 534000, and the NMP of 95 parts by weight Mix it according to the composition ratio, stir it sufficiently to make it into a uniform solution, and make a viscous adhesive.

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Abstract

A lithium ion secondary battery which secures both of ion conductivity and adhesive strength at the same time, is compact, does not require a solid casing, is thin in optional form and besides shigh in charge and discharge efficiency and is stable and practical, and its manufacture. This lithium ion secondary battery is of a structure having layers of laminates in each of which a positive electrode and negative electrode are joined to a separator including a nonaqueous electrolyte including Li ions by adhesive resin layers each consisting of the mixed phase of an electrolyte phase, a polymer gel phase containing an electrolyte, and a polymer solid phase.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery in which a positive electrode and a negative electrode face each other by sandwiching a separator holding an electrolyte, and particularly relates to a thin lithium ion secondary battery having excellent charge and discharge characteristics. Background technique [0002] There is a strong demand for miniaturization and weight reduction of portable electronic devices, and the realization of these requires higher voltage, higher energy density, higher load resistance, and safety assurance. Various battery developments and improvements are currently underway. Lithium-ion batteries are secondary batteries that can achieve high voltage, high energy density, and high load resistance among existing batteries, and are the most promising batteries that can meet the above requirements. [0003] A lithium ion secondary battery has, as its main components, a positive electrode, a negative electrode, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 滨野浩司盐田久吉田育弘村井道雄犬塚隆之相原茂白神昭
Owner MITSUBISHI ELECTRIC CORP
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