Nummular non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of secondary batteries, secondary battery manufacturing, cylindrical shell batteries/batteries, etc., can solve the problems of reduced discharge load characteristics, thick electrodes, low output applications, etc., to achieve The effect of high discharge load characteristics

Inactive Publication Date: 2008-10-15
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this type of battery, since the electrode is thick, the diffusion resistance of lithium ions with respect to the thickness direction of the electrode increases, and the discharge load characteristic decreases, and there is a problem that it can only be used for low output applications.

Method used

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  • Nummular non-aqueous electrolyte secondary battery
  • Nummular non-aqueous electrolyte secondary battery
  • Nummular non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078]

[0079] Using N-methyl-2-pyrrolidone (NMP N-methyl-2-pyrrolidone) as a solvent, add 80 parts by weight of LiCoO as a positive electrode active material 2 , 10 parts by weight of acetylene black (acetylene black) as a conductive additive and 5 parts by weight of polyvinylidene fluoride (PVDF polyvinylidene fluoride) as a binder, and mixed uniformly to prepare a paste containing a positive electrode mixture. The paste containing the positive electrode mixture was coated on both sides of an aluminum foil with a thickness of 20 μm as a positive electrode current collector so that the active material coating length on the surface side was 1221 mm and the active material coating length on the back side was 1155 mm, and dried. . Then, a calendar treatment was performed to adjust the thickness of the electrode so that the total thickness was 134 μm, and it was cut into a width of 3.0 mm to form a strip-shaped positive electrode. Uncoated active material portions were formed...

Embodiment 2

[0092]

[0093] The thickness of the positive electrode current collector is 25 μm, the coating length of the active material is 678 mm on the surface side, 624 mm on the back side, and the total thickness after calendering is 162 μm, and the width is 2.0 mm. The same as in Example 1 except that Operate and make the positive electrode.

[0094]

[0095] The thickness of the negative electrode current collector is 20 μm, the coating length of the active material is 2, the surface side: 667 mm, the back side: 667 mm, the total thickness after calendering is 177 μm, and the width is 2.5 mm, except that it is the same as Example 1 Operation, make the negative electrode.

[0096] Using the above-mentioned positive electrode and the above-mentioned negative electrode, the thickness of the separator is 3.3mm, and the battery can with an outer diameter of 20mm and a height of 4.0mm is used, except that the same operation is performed as in Example 1, and the volume of the battery ...

Embodiment 3

[0099]

[0100] The coating length of the active material was 3146 mm on the front side, 3047 mm on the back side, and the total thickness after calendering was 115 μm and the width was 3.5 mm. The positive electrode was produced in the same manner as in Example 1.

[0101]

[0102] The coating length of the active material is: 3121 mm on the front side and 3121 mm on the back side, the total thickness after calendering is 122 μm, and the width is 4.0 mm. The negative electrode is produced in the same manner as in Example 1 except that.

[0103] Using the above-mentioned positive electrode and the above-mentioned negative electrode, the width of the separator is 4.8mm, and the battery can with an outer diameter of 35mm and a height of 5.5mm is used, except that the same operation is performed as in Example 1, and the volume of the battery is 5.3cm. 3 coin-shaped non-aqueous electrolyte secondary battery.

[0104] The outer diameter D of the wound body in this embodiment is...

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Abstract

The invention provides a coin-shaped non-water electrolyte secondary battery, having a high characteristic of discharge load without distorted battery when charging and discharging. The invention is characterized in that a strip anode (1) and a strip cathode (2) are winded to form a cylindraceous winder (10) by regarding a strip clapboard (3) as middle medium. Winding shaft of the winder (10) shares a same direction with height of a battery cylinder (13). The ratio D / H of outer diameter D (mm) of the winder (10) and height H (mm) at direction of the winding shaft is 1 to 25. The ratio R / A of area A (mm2) of upper surface of the winder (10) and reaction valid area R (mm2) relative to the anode (1) and the cathode (2) is 9 to 25.

Description

technical field [0001] The present invention relates to a coin-shaped nonaqueous electrolyte secondary battery having high discharge load characteristics. Background technique [0002] Coin-shaped non-aqueous electrolyte secondary batteries represented by coin-shaped lithium-ion secondary batteries are also called button-shaped or flat-shaped non-aqueous electrolyte secondary batteries, and are used in earphones (headphone sets), clocks and watches. Small-sized batteries for heavy loads used in so-called wearable devices that people carry around, such as small communication devices and body-mounted medical devices, have attracted attention. [0003] Conventional coin-shaped lithium ion secondary batteries include, for example, batteries in which positive and negative electrodes punched out into a circular shape are stacked with a separator interposed therebetween. However, since the electrode is thick, this type of battery has a problem of increasing the diffusion resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M2/02H01M10/0525H01M10/0566H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50H01M10/0427H01M10/0431H01M10/0525H01M50/109
Inventor 樋口勇人中泽一幸佐野健一
Owner HITACHT MAXELL LTD
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