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Nonaqueous-electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as performance degradation

Active Publication Date: 2013-07-31
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the internal resistance of the battery is large, there is a problem of performance degradation when charging and discharging with a large current

Method used

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  • Nonaqueous-electrolyte secondary battery
  • Nonaqueous-electrolyte secondary battery
  • Nonaqueous-electrolyte secondary battery

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach ）

[0017] figure 1 is a schematic cross-sectional view of the flat non-aqueous electrolyte battery 1 . figure 2 yes figure 1 The enlarged cross-sectional view of part A. The nonaqueous electrolyte battery 1 includes a wound electrode group 2 . The wound electrode group 2 is accommodated in an outer package member 3 . A non-aqueous electrolyte (not shown) is also filled in the exterior member 3 .

[0018] Wound electrode group 2 such as figure 2 As shown, it is composed of positive electrode 4, negative electrode 5 and separator 6. The wound electrode group 2 is formed by stacking the positive electrode 4 and the negative electrode 5 with the separator 6 interposed therebetween, and winding them into a flat shape.

[0019] Such as figure 1 As shown, in the vicinity of the outer peripheral end of the wound electrode group 2 , the positive terminal 7 is electrically connected to the positive electrode 4 , and the negative terminal 8 is electrically connected to the negative...

no. 2 Embodiment approach ）

[0083] The nonaqueous electrolyte battery of the second embodiment has the same configuration as that of the first embodiment except for using the positive electrode described below.

[0084] The positive electrode 4 has a positive electrode current collector 4 a and a positive electrode active material layer 4 b. The positive electrode active material layer 4b contains a positive electrode active material and optionally added a conductive agent and a binder. The positive electrode active material layer 4b is provided on one or both surfaces of the positive electrode current collector 4a. The positive electrode active material, the conductive agent, the binder, their compounding ratio, and the positive electrode current collector may be the same as those described in the first embodiment.

[0085] Figure 4 It is a perspective view showing an example of a positive electrode. Figure 4 A part of the positive electrode 4 in which the positive electrode active material layer 4...

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Abstract

A nonaqueous-electrolyte secondary battery containing a positive electrode and a negative electrode is provided in an embodiment. The positive electrode contains: a positive-electrode collector having a first surface; and a positive-electrode active-material layer. The negative electrode contains: a negative-electrode collector having a second surface that faces the first surface of the positive electrode; and a first negative-electrode active material provided on part of said second surface. The negative-electrode collector contains: a coated section on which the first negative-electrode active-material layer is provided; and a non-coated section, adjacent to the coated section in a direction parallel to the second surface, in which the first negative-electrode active material layer is not present. Said non-coated section is adjacent to one or more of the edges of the negative-electrode collector and extends along said one or more edges. The distance(s) from the boundary between the coated section and the non-coated section and the aforementioned one or more edges of the negative-electrode collector is / are between 5 and 20 mm, inclusive. The density of the first negative-electrode active-material layer is 2.1 to 2.4 g / cc. The ratio (W1 / W2) of the mass per unit area (W1) of the coated section to the mass per unit area (W2) of the non-coated section is 0.997 to 1.

Description

technical field [0001] Embodiments of the present invention relate to a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, techniques for using non-aqueous electrolyte secondary batteries as power sources for hybrid vehicles or as power storage devices for power generators using natural energy such as sunlight or wind power have been studied. The load of the power supply for automobiles changes significantly depending on the running state of the automobile, etc. The power output of a generator can vary significantly depending on environmental conditions. Therefore, the nonaqueous electrolyte secondary battery sometimes needs to discharge or store a large current in a relatively short period of time. Therefore, nonaqueous electrolyte secondary batteries are required to have excellent large current characteristics. However, when the internal resistance of the battery is large, there is a problem of performance degradation when charging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/485H01M4/64H01M10/0525H01M10/058H01M50/534
CPCH01M4/64H01M10/0587H01M4/13H01M4/131H01M2/26H01M4/661H01M2004/021Y02E60/122H01M4/0435H01M4/485H01M10/0525Y02E60/10Y02P70/50H01M50/534Y02T10/70
Inventor 森岛秀明小林隆史中畑政臣森和彦
Owner KK TOSHIBA