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Nonaqueous electrolyte secondary battery

一种非水电解质、二次电池的技术，应用在非水电解质蓄电池、二次电池、锂蓄电池等方向，能够解决短路部分易扩大等问题，达到防止绕线位移、提高输出特性的效果

Active Publication Date: 2009-08-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Meanwhile, the microporous separator made of resin has a disadvantage in that the short-circuited portion is more likely to expand due to melting or the like.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] (Battery 1)

[0093] (production of positive electrode)

[0094] 30 kg of LiNi as the cathode active material was stirred by using a double-arm kneader 0.71 co 0.2 Al 0.05 mn 0.02 Mg 0.02 o 2 , 10 kg of polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP) (#1320, purchased from Kureha Chemical Industry Co., Ltd. (solid content: 12 wt %)) solution, 900 g of acetylene as a conductive agent black, and an appropriate amount of NMP to prepare positive electrode active material mixed slurry. The slurry thus obtained was coated on both surfaces of an aluminum foil (thickness: 15 μm) as a current collector, which was then dried and rolled until its total thickness reached 108 μm, thereby producing a positive electrode plate. Subsequently, the positive electrode plate was cut such that the size of the positive electrode active material on each surface of the current collector was 56 mm in width and 600 mm in length, thereby manufacturing a positive electrode. T...

Embodiment 2

[0141] (Battery 12~35)

[0142] Batteries 12-35 are manufactured in the same manner as battery 2, except that the general formula (1) is used: LiNi 1-a-b-c-d co a Al b m 1 c m 2 d o 2 positive active material shown, and M 1 and M 2 Use the elements shown in Table 3, and Ni, Co, Al, M 1 and M 2 The change of the molar ratio is shown in Table 3. Here, M 2 Contains 2 to 4 elements. m 2The molar ratios of each element contained in are the same. The molar ratio d is the element M in the oxide shown in general formula (1) 2 total molar ratio.

[0143] Table 3 (to be continued)

[0144]

[0145] Table 3 (continued)

[0146]

Ah per unit battery capacity

The area of ​​the positive electrode active material layer

(cm 2 ) negative active material

layer area

(cm 2 ) porous heat-resistant layer

area

(cm 2 ) non-aqueous electrolyte

amount

(ml) Ratio B / A

(ml / m 2 ) battery 2 395 371 742 7.4 100 ...

Embodiment 3

[0162] (Battery 36~64)

[0163] Batteries 36-64 are manufactured in the same manner as battery 2, except that the general formula (2): LiNi a co b mn c m 3 d o 2 Positive electrode active materials shown, along with the molar ratio a of nickel, b of cobalt, c of manganese, and the element M 3 The type and molar ratio d of the changes are shown in Table 5.

[0164] Table 5 (to be continued)

[0165]

[0166] Table 5 (continued)

[0167]

Ah per unit battery capacity

The area of ​​the positive electrode active material layer

(cm 2 ) Negative active material

The area of ​​the material layer

(cm 2 ) Porous heat-resistant layer

the area of

(cm 2 ) non-aqueous electrolysis

quality quantity

(ml) Ratio B / A

(ml / m 2 ) battery 36 395 371 742 7.4 100 battery 37 395 371 742 7.4 100 battery 38 395 371 742 7.4 100 battery 39 395 371 742 7.4 100 battery 40 395 371 742 7...

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Abstract

Disclosed is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer, and the negative electrode includes a negative electrode active material layer. The positive electrode active material layer includes a lithium-containing metal oxide containing nickel as a positive electrode active material. The area of ​​the positive electrode active material layer per unit battery capacity Ah is 190˜800 cm 2 . The porous heat-resistant layer is located between the positive electrode and the negative electrode, and the ratio of the amount of non-aqueous electrolyte to the area of ​​the porous heat-resistant layer is 70-150ml / m2.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, and more particularly to a nonaqueous electrolyte secondary battery capable of suppressing reduction in capacity due to vibration. Background technique [0002] In recent years, nonaqueous electrolyte secondary batteries, especially lithium ion secondary batteries, are being actively studied as secondary batteries with higher operating voltage and higher energy density, which can be used to drive portable electronic devices such as mobile phones, laptops, Power supply for upper-type personal computers and video cameras. In addition, research on it has been accelerated for use as a power source for devices requiring higher power output, such as electric tools or electric vehicles. Lithium-ion secondary batteries are being actively studied as high-capacity power sources to replace commercially available nickel-metal hydride storage batteries especially for hybrid electric vehic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M2/16H01M4/02H01M4/58H01M4/131H01M4/36H01M4/505H01M4/52H01M4/525H01M4/62H01M10/05H01M10/0525H01M10/0569H01M10/0587H01M10/36H01M50/409H01M50/443H01M50/491
CPCY02E60/122H01M4/525Y02T10/7011H01M10/0525H01M2004/021H01M2/16H01M4/131H01M4/621H01M10/052Y02E60/10H01M50/409H01M50/446H01M50/46Y02P70/50H01M50/491H01M50/443H01M50/414H01M4/505H01M50/431Y02T10/70
Inventor 永山雅敏中岛琢也村冈芳幸竹内崇
Owner PANASONIC CORP
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