Current collector for nonaqueous electrolyte secondary battery, electrode for nonaqueous electrolyte secondary battery, method for manufacturing the current collector and the electrode, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, electrode manufacturing, etc., can solve the problems of electrode wave, uneven stress, etc., and achieve improved flexibility and less characteristic deterioration. , the effect of high reliability

Inactive Publication Date: 2011-06-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when the active material layers are formed on both sides of the current collector, if the amount of the active material loaded on one side is not uniform with the amount of the active material loaded on the other side, the above-mentioned Uneven stress exists, causing problems such as electrode ripple

Method used

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  • Current collector for nonaqueous electrolyte secondary battery, electrode for nonaqueous electrolyte secondary battery, method for manufacturing the current collector and the electrode, and nonaqueous electrolyte secondary battery
  • Current collector for nonaqueous electrolyte secondary battery, electrode for nonaqueous electrolyte secondary battery, method for manufacturing the current collector and the electrode, and nonaqueous electrolyte secondary battery
  • Current collector for nonaqueous electrolyte secondary battery, electrode for nonaqueous electrolyte secondary battery, method for manufacturing the current collector and the electrode, and nonaqueous electrolyte secondary battery

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0137] figure 1 A schematic configuration of a current collector for a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention is shown in plan view. figure 2 A part thereof is shown enlarged by a perspective view.

[0138] The current collector 10 of the illustrated example includes a strip-shaped metal foil 11 and a plurality of protrusions 12 formed in a predetermined array on at least one surface of the metal foil 11 .

[0139] Such as figure 2 As shown, the protrusion 12 is formed in a substantially rhombic shape in plan view. More specifically, when the projection 12 is viewed from a direction perpendicular to the surface of the metal foil 11, both end portions in the long-axis direction (hereinafter referred to as long-axis direction ends) 12a and two end portions in the short-axis direction (Hereinafter referred to as short-axis direction end portion) 12b is formed so as to protrude outward with rounded corners. In addition, t...

Embodiment approach 2

[0186] Next, Embodiment 2 of the present invention will be described. Figure 7 A part of the current collector according to Embodiment 2 of the present invention is enlargedly shown by a perspective view in .

[0187] exist Figure 7 shown in the current collector 10A, with figure 2 In the current collector 10 shown in the same manner, as the protrusion 26, the long-axis direction end 26a and the short-axis direction end 26b protrude outward with rounded corners, and the middle part between the long-axis direction end 26a and the short-axis direction end 26b 26c are all rounded back towards the inside.

[0188] Figure 7 The current collector 10A with figure 2 The current collector 10 is different in that the height of the long-axis direction end 26a of the protrusion 26 is higher than the height of the short-axis direction end 26b.

[0189] Moreover, between the two longitudinal-axis direction end parts 26a, the main upper surface part 26d whose height is equal to or ...

Embodiment approach 3

[0192] Next, Embodiment 3 of the present invention will be described. Figure 8 In FIG. 2 , a part of the current collector according to Embodiment 3 of the present invention is shown enlarged by a perspective view.

[0193] exist Figure 8 shown in the current collector 10B, with Figure 7 In the current collector 10A shown, similarly, as the protrusion 28, the long-axis direction end portion 28a and the short-axis direction end portion 28b protrude outward with rounded corners, and the intermediate portion between the long-axis direction end portion 28a and the short-axis direction end portion 28b 28c all rounded back inwardly. In addition, the height of the long-axis direction end portion 28a is higher than the height of the short-axis direction end portion 28b, and between the two long-axis direction end portions 28a, a main upper surface having a height equal to or higher than these end portions 28a is formed. Section 28d. On both sides of the main upper surface porti...

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Abstract

Disclosed is a current collector, in which protrusions are formed in a predetermined array on one or two faces of a metal foil. The protrusions are formed in a substantial rhomboid and arranged in a staggered array. The protrusions are also formed to protrude outward at the individual two end portions in the two orthogonal axial directions. On the other hand, the intermediate portions between the individual end portions are recessed inward. When columnar bodies of an active material are formed on the protrusions thereby to constitute active material layers, gaps between the individual protrusions can be enlarged at portions where the clearances between the individual protrusions are the smallest. As a result, the internal stresses of the active material layer, which occur at the time of charging and discharging of a battery, can be relaxed to elongate the lifetime of the battery.

Description

technical field [0001] The present invention relates to nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries, and particularly relates to a technique for improving the loading capacity of active materials of current collectors used in nonaqueous electrolyte secondary batteries. Background technique [0002] In recent years, lithium ion secondary batteries have been widely used as power sources for portable electronic devices. Lithium-ion secondary batteries use carbonaceous materials that can intercalate and deintercalate lithium as the negative electrode active material, and use LiCoO as the positive electrode active material. 2 (Lithium cobaltate) and other transition metal and lithium complex oxides (lithium-containing transition metal oxides). Accordingly, in the lithium ion secondary battery, battery characteristics of high voltage and high discharge capacity can be realized. [0003] However, in recent years, electronic devices and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M4/02H01M4/04H01M4/48H01M10/40H01M4/13H01M4/131H01M4/134H01M4/139H01M4/1391H01M4/1395H01M10/052H01M10/0587
CPCY02E60/122H01M10/052H01M4/0404H01M4/70H01M4/661H01M4/131H01M10/0587H01M4/1391Y02E60/10Y10T29/49108Y10T29/49115Y02P70/50H01M4/02H01M4/04H01M10/05
Inventor 别所邦彦末次大辅加藤诚一
Owner PANASONIC CORP
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