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Separator for lithium secondary battery and lithium secondary battery including the same

A technology for secondary batteries and separators, applied in secondary batteries, secondary battery parts, battery electrodes, etc., can solve the problems of the separator holes being not easy to close, low performance, easy to tear, etc.

Active Publication Date: 2012-08-08
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, although conventional polyethylene (PE)-based separators can ensure safety through the shut-off effect due to their lower melting point than polypropylene (PP)-based separators, there are limitations such as low durability, Short lifetime and low performance at high voltage due to oxidation at lower voltage than PP based separators
On the other hand, although PP-based separators can be characterized by high heat resistance, long life, and high performance at high voltage, there are limitations as follows: The characteristic of elongation in one direction is typically advantageous for dry fabrication, they can be easily torn in one direction
Also, safety can be challenged as bulkhead holes are not easily closed at high temperatures

Method used

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  • Separator for lithium secondary battery and lithium secondary battery including the same
  • Separator for lithium secondary battery and lithium secondary battery including the same
  • Separator for lithium secondary battery and lithium secondary battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1～6

[0063] By using LiCoO as the cathode active material 2 , polyvinylidene fluoride (PVdF) as a binder, and carbon as a conductive material were dispersed in N-methyl-2-pyrrolidone solvent at a weight ratio of 92:4:4 to prepare a positive electrode active material slurry. A positive electrode plate was produced by coating the positive electrode active material slurry on an aluminum foil having a thickness of 15 μm, drying the positive electrode active material slurry coated on the aluminum foil, and drying the dried positive electrode active material slurry coated on the aluminum foil. The positive electrode active material slurry is rolled.

[0064] Negative electrode active material slurry was prepared as follows: Graphite as the negative electrode active material, styrene-butadiene rubber (SBR) as the binder and carboxymethyl cellulose (CMC) as the thickener were mixed in a weight ratio of 96:2:2 mixed and then dispersed in water. The negative electrode plate was manufacture...

experiment Embodiment 1

[0071] Experimental Example 1: Tear in one direction

[0072] TD tensile strengths of the separators prepared according to the embodiment and the comparative example were measured and shown in Table 1 according to the following standards.

[0073] ◎: 1000kgf / cm 2 ≤TD

[0074] ○: 750kgf / cm 2 ≤TD2

[0075] △: 500kgf / cm 2 ≤TD2

[0076] X: TD2

experiment Embodiment 2

[0077] Experimental Example 2: Safety Evaluation

[0078] With respect to the lithium secondary batteries manufactured according to the embodiment and the comparative example, short circuits were evaluated after exposing them to 150° C. for 10 minutes.

[0079] After the lithium secondary batteries manufactured according to the embodiment and the comparative example were charged at a rate of 3c up to 10V, states of the batteries were observed.

[0080] One of the following symbols is indicated depending on the battery status:

[0081] ◎: leaked

[0082] ○: Smoking, <200°C

[0083] △: Smoke, >200℃

[0084] X: Fire.

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Abstract

The present disclosure relates to a separator and a lithium secondary battery including the same, which may secure not only safety but also excellent long life span and high voltage properties. The separator of the present invention includes a PE or PP base film and a PE-based or PP-based powder provided on and / or in the base film with a wherein the ingredients of the powder are different from those of the base film.

Description

[0001] related application [0002] This application claims the benefit of U.S. Provisional Patent Application No. 61 / 439,300, filed February 3, 2011 in the United States Patent and Trademark Office, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present technology generally relates to a separator that can ensure not only safety but also excellent long-life and high-voltage properties, and a lithium secondary battery including the same. Background technique [0004] Lithium secondary batteries are rechargeable and dischargeable. By using a lithium secondary battery, the operating time can be extended and the product weight can be reduced. In lithium secondary batteries, high voltage and high battery capacity can be achieved. Therefore, they have been used in small electronic devices such as mobile phones, mobile personal computers, etc., and in recent applications on electric cars and scooters. Due to their large ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052H01M50/403H01M50/417H01M50/451H01M50/491H01M50/494
CPCH01M2/1686Y02E60/122H01M2/1646H01M4/587Y02T10/7011H01M10/0525H01M4/525Y02E60/10H01M50/403H01M50/417H01M50/451H01M50/491H01M50/494H01M10/02H01M50/449H01M50/443H01M50/489Y02P70/50Y02T10/70
Inventor 韩成勋安昶范
Owner SAMSUNG SDI CO LTD
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