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Non-aqueous secondary battery

A non-aqueous secondary battery, positive electrode current collector technology, applied in the direction of secondary batteries, non-aqueous electrolyte battery electrodes, battery electrodes, etc., can solve the problem of inability to ensure capacity, and achieve the effect of large capacity

Active Publication Date: 2009-02-25
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the present inventors have found through research that, as described above, if a flat wound electrode body is formed using a positive electrode having an increased density of the positive electrode mixture layer and used for a thin battery, the expected capacity may not always be ensured.

Method used

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Examples

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Embodiment 1

[0073]

[0074] 97% by mass of lithium cobaltate (average particle size: 12 μm) as an active material, 1.5% by mass of acetylene black as a conductive additive, 1.5% by mass of polyvinylidene fluoride (PVDF) as a binder, and 1.5% by mass of polyvinylidene fluoride (PVDF) as a solvent NMP prepares a composition containing a positive electrode mixture. The preparation of the composition containing the positive electrode mixture is carried out as follows. Dissolve PVDF in NMP in advance, add the above-mentioned active material and acetylene carbon black to the solution, and further add NMP while stirring, and fully disperse it. Adjust viscosity. Use an applicator to evenly coat the composition containing the positive electrode mixture at a thickness of 12 μm and a tensile strength of 250 N / mm 2 , Both sides of the Al alloy foil made of A3003H with an elongation at break of 1.4%, and then rolled with a roll press under the conditions of a roll temperature of 100°C and a pressur...

Embodiment 2

[0085] Adjust the width and length of the electrodes and separators, and operate in the same manner as in Example 1 except that the wound electrode body produced is inserted into a square (width / thickness ratio: 1.7) battery with a width of 17 mm, a thickness of 10 mm, and a height of 65 mm. A non-aqueous secondary battery was produced in the same manner as in Example 1 except for the case (outer body).

Embodiment 3

[0087] Adjust the width and length of the electrodes and separators, except that the operation is the same as in Example 1, and the fabricated wound electrode body is inserted into a square (width / thickness ratio: 10.0) battery with a width of 40 mm, a thickness of 4 mm, and a height of 50 mm. A non-aqueous secondary battery was produced in the same manner as in Example 1 except for the case (outer body).

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Abstract

The invention provides a thin non-aqueous secondary battery with big capacity, which is a battery made by winding an anode, a cathode and a separator having an anode mixture layer on one or two surfaces of an anode collector body into a spiral shape, and sealing the obtained winding electrode body and a non-aqueous electrolyte into an exterior body with width / thickness ratio ranging from 1.7 to 10.0 together, characterized in that density of the anode mixture layer is more than 3.5g / cm3 and porosity thereof is less than 25%, the anode collector body is an A1 alloy foil with a thickness less than 15 microns and a tensile strength more than 200N / mm2. Above topics is solvable by the non-aqueous secondary battery.

Description

technical field [0001] The present invention relates to a non-aqueous secondary battery with large capacity. Background technique [0002] In recent years, for mobile communication applications such as portable computers and personal digital assistants, further miniaturization and weight reduction are required. Non-aqueous secondary batteries having a non-aqueous electrolyte are used in such devices, but further increases in capacity are required for non-aqueous secondary batteries in accordance with the above-mentioned needs. [0003] As a non-aqueous secondary battery, the general structure is, for example, to form a layer containing LiCoO on the current collector 2 The positive electrode of the positive electrode mixture layer of the lithium transition metal composite oxide and the negative electrode of the negative electrode mixture layer containing the negative electrode active material such as carbon material are formed on the current collector, and the separator is i...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/64H01M4/66H01M4/02H01M2/02H01M4/13H01M4/70H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50H01M4/13H01M4/662H01M10/0587H01M2004/021H01M10/0525
Inventor 井上裕靖下冈俊晴喜多房次津幡英树
Owner MAXELL HLDG LTD
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