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Separator for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte storage batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of reduced current flow, difficulty in achieving sufficient effects, and reduced capacity.

Inactive Publication Date: 2012-06-13
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the purpose, most of the compounds used as overcharge preventers are electrochemically and chemically active substances. When such substances are added to the electrolyte in a large amount, it may cause the battery to fail under normal operating conditions. The reaction also occurs under the condition of the battery, which will cause the resistance of the battery to increase and the capacity to decrease.
On the other hand, if the addition amount of these substances is reduced, in the lithium secondary battery for EV or the lithium secondary battery for HEV that flows a large current, the amount of current that can be consumed during overcharging is reduced, and it is difficult to achieve sufficient Effect

Method used

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  • Separator for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
  • Separator for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
  • Separator for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0294]

[0295] In a dry argon atmosphere, dissolve fully dried lithium hexafluorophosphate (LiPF 6 ), and make the lithium hexafluorophosphate (LiPF 6 ) to a ratio of 1.0 mol / l, thereby obtaining a non-aqueous electrolyte.

[0296]

[0297] Use LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 As the positive active material, and to the LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 Add 5 parts by weight of acetylene black and 5 parts by weight of polyvinylidene fluoride (manufactured by Kureha Chemical Co., Ltd., trade name "KF-1000") to 90 parts by weight, mix, and disperse the mixture in N-methyl-2-pyrrolidone In, make slurry. The resulting slurry was evenly coated on both sides of an aluminum foil with a thickness of 15 μm as a positive electrode current collector, and after drying, it was rolled to a thickness of 81 μm by a press, and cut into an active material layer having a width of 100 mm and a length of 100 mm. It had the shape of an uncoated part with a width of 30 mm, and this was used as a p...

Embodiment 2

[0309] Using the same commercially available three-layer separator with a thickness of 25 μm as used in Example 1 as a base material, one surface thereof was subjected to Mo sputtering treatment to form a conductive layer. The thickness of the Mo layer was 147 nm, and the surface resistance was 11Ω. In addition, the puncture strength of the separator was 310 g, and the porosity was 38%.

[0310] Using the obtained separator, a battery was produced in the same manner as in Example 1, and an overcharge test was performed.

[0311] The results are shown in Table 1.

Embodiment 3

[0313] A battery was produced in the same manner as in Example 1 except that the conductive layer of the separator obtained in Example 2 was opposed to the negative electrode, and an overcharge test was performed.

[0314] The results are shown in Table 1.

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Abstract

The invention relates to a separator for a non-aqueous electrolyte secondary battery and a non-aqueous electrolyte secondary battery. The separator is for use in a non-aqueous electrolyte secondary battery provided with: positive and negative electrodes capable of occluding and discharging lithium; a separator; and a non-aqueous electrolyte including a non-aqueous solvent and an electrolyte. The separator comprises a conductive layer wherein (1) the apparent volume resistivity of the conductive layer is 1*10-4 Omega*cm to 1*106 Omega*cm, or (2) the apparent volume resistivity of the conductive layer is 1*10-6 Omega*cm to 1*106 Omega*cm, or (3) the surface electrical resistance of the conductive layer is 1*10-2 Omega to 1*109 Omega, and the film thickness of the conductive layer is less than 5 [mu]m.

Description

technical field [0001] The present invention relates to a separator for a nonaqueous electrolyte secondary battery capable of realizing a safe nonaqueous electrolyte secondary battery even in the case of overcharging, and a nonaqueous electrolyte secondary battery using the separator for a nonaqueous electrolyte secondary battery. Battery. Background technique [0002] Lithium secondary batteries are composed of the following parts: a positive electrode with an active material layer containing a positive electrode active material such as a lithium compound represented by lithium cobaltate is formed on a current collector; The negative electrode of the active material layer of the negative electrode active material such as a carbon material capable of occluding and releasing lithium, and LiPF dissolved in an aprotic non-aqueous solvent 6 A non-aqueous electrolytic solution of an electrolyte such as a lithium salt, and a separator formed of a polymer porous film, this lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0566H01M50/414H01M50/423H01M50/431H01M50/434H01M50/451H01M50/489H01M50/529
CPCH01M2/1686Y02E60/122H01M10/0569H01M2/1646H01M10/0568H01M10/052H01M2/1653H01M2/166Y02E60/10H01M50/431H01M50/446H01M50/451H01M50/414H01M50/434H01M50/489H01M50/423H01M2300/0028H01M50/463H01M50/449H01M4/38H01M10/42H01M50/51H01M50/20H01M2010/4292
Inventor 中岛聪泷口加奈子石垣宪一
Owner MITSUBISHI CHEM CORP
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