Electrode assembly for secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrode assembly technology, applied in battery electrodes, secondary batteries, secondary battery manufacturing, etc., can solve problems such as battery temperature rise, achieve the effects of ensuring safety performance, solving safety problems, and reducing production costs

Active Publication Date: 2013-07-24
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when the temperature of the battery rises abnormally and sharply due to a short circuit or overcharge inside the battery, it is difficult to quickly suppress the above-mentioned heat generation only by a safety device installed outside the battery

Method used

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  • Electrode assembly for secondary battery and lithium secondary battery comprising same
  • Electrode assembly for secondary battery and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] LiCoO as the positive electrode active material with a weight ratio of about 94:4:2 2 , polyvinylidene fluoride as a binder, and Ketjen black as a conductive material were mixed with N-methylpyrrolidone to prepare a cathode active material slurry. After coating the slurry on the aluminum foil, the slurry coated on the aluminum foil was dried to prepare a positive electrode coated part. The composition (PTC material) is coated on the positive electrode coating part to prepare the positive electrode, wherein based on 100 parts by weight of LiCoO 2 , The composition (PTC material) comprises 10 parts by weight of carbon black and 15 parts by weight of high-density polyethylene.

[0067] Amorphous carbon as a negative active material and polyvinylidene fluoride as a binder were mixed with N-methylpyrrolidone at a weight ratio of about 95:5 to prepare a negative active material slurry. After coating the slurry on the copper foil, the slurry coated on the copper foil was dri...

Embodiment 2

[0070] A pouch type lithium secondary battery was completed in the same manner as in Example 1 except that carbon fiber was used instead of carbon black.

Embodiment 3

[0072] In addition to using BaTiO 3 A pouch-type lithium secondary battery was completed in the same manner as in Example 1 except for the PTC material.

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Abstract

The present invention provides an electrode assembly for a secondary battery and a lithium secondary battery. According to the present invention, the electrode assembly comprises: an anode having an anode active material layer that is formed on an anode collector; a cathode having a cathode active material layer that is formed on a cathode collector; and an olefin-based separation film which is interposed between the anode and the cathode, wherein a positive temperature coefficient (PTC) material layer is formed on an upper surface of an active material layer of either the anode or the cathode. As a result, the PTC material layer allows active material to have a constant conductivity when a battery is operating normally, regardless of charging or discharging, and convert into a nonconductor when internal temperature of the battery climbs due to a short circuit or an accident.

Description

technical field [0001] This application is based on and claims priority from Korean Patent Application No. 10-2011-0064785 filed in the Korean Intellectual Property Office on June 30, 2011, the contents of which are incorporated herein by reference in their entirety. [0002] The present invention disclosed herein relates to an electrode assembly for a secondary battery, and a lithium secondary battery including the electrode assembly, in which the safety performance of the secondary battery under abnormal conditions has been improved. Background technique [0003] Recently there has been a growing interest in energy storage technologies. As the field of application of energy storage technology expands not only to power sources for cellular phones, camcorders, and notebook personal computers, but also to power sources for electric vehicles, research and development of electrochemical devices are increasingly being attempted. Electrochemical devices are the most notable fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M2/16H01M10/052B60L11/18H01M10/058H01M50/417
CPCH01M10/5042H01M10/52H01M4/625H01M2200/106H01M2/348Y02E60/12H01M2/1653H01M2220/20H01M4/366Y02E60/10H01M50/581Y02P70/50H01M50/417H01M4/13H01M10/058H01M10/052H01M50/431H01M2220/30H01M2220/10Y02T10/70
Inventor 金甫炫金大日李重玟
Owner LG ENERGY SOLUTION LTD
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