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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, used in non-aqueous electrolyte batteries, secondary batteries, lithium batteries, etc., can solve the problem of easy expansion of short-circuit parts, achieve excellent vibration resistance, prevent winding displacement, high The effect of the energy output characteristic

Active Publication Date: 2008-02-27
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] LiNi 1-a-b-c-d co a al b m 1 c m 2 d o 2

Co's

The molar ratio of

a

Al's

The molar ratio of

b

m 1 of

The molar ratio of

c

m 1 type

m 2 of

The molar ratio of

d

m 2 type

Ni's

The molar ratio of

battery 2

0.2

0.05

...

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] LiNi a co b mn c m 3 d o 2

Molar ratio of Ni

a

molar ratio of Co

b

Molar ratio of Mn

c

m 3 type

m 3 molar ratio

d

battery 36

0.2

0.4

0.4

-

-

battery 37

0.25

0.375

0.375

-

-

battery 38

0.5

0.25

0.25

-

-

battery 39

0.55

0.225

0.225

-

-

battery 40

0.4

0.2

0.4

-

-

battery 41

0.375

0.25

0.375

...

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Abstract

Disclosed is a nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode contains a positive electrode active material layer, while the negative electrode contains a negative electrode active material layer. The positive electrode active material layer contains a lithium-containing metal oxide containing nickel as the positive electrode active material, and the area of the positive electrode active material layer per unit battery capacity is within a range of 190-800 cm2 / Ah. A porous heat-resistant layer is arranged between the positive electrode and the negative electrode, and the amount ratio of the nonaqueous electrolyte to the area of the porous heat-resistant layer is 70-150 ml / m2.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution secondary battery, in particular to a nonaqueous electrolytic solution secondary battery capable of suppressing capacity reduction due to vibration. Background technique [0002] In recent years, non-aqueous 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, Power supplies for laptop personal computers and video cameras. In addition, research on it has been accelerated for use as a power source for devices requiring higher energy output, such as electric tools or electric vehicles. Lithium-ion secondary batteries are being actively studied as high-capacity power sources to replace commodity nickel-metal hydride storage batteries (hereinafter referred to as HEVs) especially for ...

Claims

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Application Information

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