Pouch-type lithium secondary battery

一种锂二次电池、二次电池的技术，应用在二次电池、电池电极、电池组零部件等方向，能够解决显著膨胀、电池过热、高速放电特性劣化等问题

Active Publication Date: 2010-12-08
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low boiling point of dimethyl carbonate, it will expand significantly if the battery is overheated or exposed to high temperatures
If ethyl methyl carbonate or dimethyl carbonate is added as a linear carbonate or only a small amount of dimethyl carbonate is added, the swelling problem of the battery will be improved, but the high-rate discharge characteristics will deteriorate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1M LiPF 6 Added into a mixed organic solvent in which ethylene carbonate (EC) and ethyl propionate (EP) were mixed at a volume ratio of 3:7 to prepare a non-aqueous electrolyte.

[0038] Then, the electrode group was used by inserting a polyethylene porous membrane using LiCoO 2 Between the cathode as the cathode active material and the anode using artificial graphite as the anode active material, the electrode group was then placed and sealed in a pouch-shaped case made of polypropylene / aluminum / polypropylene film. The non-aqueous electrolyte prepared above was injected into the case to produce a pouch-shaped lithium secondary battery.

Embodiment 2

[0040] A pouch-shaped lithium secondary battery was prepared in the same manner as in Example 1 except that methyl butyrate was used instead of ethyl propionate.

Embodiment 3

[0042] A pouch-shaped lithium secondary battery was prepared in the same manner as in Example 1 except that propyl acetate was used instead of ethyl propionate.

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Abstract

A pouch-type lithium secondary battery includes an electrode assembly having an anode made of carbon material capable of occluding or emitting lithium ions, a cathode made of lithium-containing oxide, and a separator interposed between the cathode and the anode for electrical insulation therebetween; a pouch-type case made of sheet to provide a space receiving the electrode assembly; and a non-aqueous electrolyte injected into the electrode assembly. The non-aqueous electrolyte is a non-linear carbonate-based non-aqueous electrolyte including a lithium salt, (a) a cyclic carbonate compound, and (b) a linear ester compound selected from propionate-based compound, methyl butyrate, and propyl acetate, or their mixtures. During LiPF6 IM dissolution, the non-aqueous electrolyte has an ion conductivity of 9 mS / cm or above at about 23 DEG C. This pouch-type lithium secondary battery ensures excellent high-rate discharging characteristics and solves swelling problems associated with a pouch-type lithium secondary battery.

Description

technical field [0001] The present invention relates to a pouch-shaped lithium secondary battery having a pouch-shaped case formed of a sheet. Background technique [0002] Recently, there has been increasing interest in energy storage technologies. As energy storage technology extends to mobile phones, camcorders and notebook computers, and further to electric vehicles, the demand for high-energy-density batteries used as energy sources for these electronic devices increases. Lithium-ion secondary batteries are one of the most satisfactory batteries, and a great deal of research for improvement is currently actively underway. [0003] Lithium secondary batteries can be made in various shapes. Representative examples include angular lithium secondary batteries, columnar lithium secondary batteries, and pouch-shaped lithium secondary batteries. [0004] Such as figure 1 As shown, the pouch-shaped lithium secondary battery 10 generally includes an electrode group 11 and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/587H01M10/0525H01M10/0569H01M50/105H01M50/119H01M50/121H01M50/124
CPCY02E60/122H01M2300/0025H01M10/0569H01M4/587H01M10/0525H01M2/0207Y02E60/10Y02P70/50H01M50/105H01M50/119H01M50/121H01M50/124H01M10/0568H01M2300/0037
Inventor 李镐春曹正柱全钟昊
Owner LG ENERGY SOLUTION LTD
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