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Lithium secondary battery having improved stability to overcharge

A lithium secondary battery, overcharge technology, applied in the direction of secondary battery, lithium storage battery, non-aqueous electrolyte storage battery, etc., can solve the problem of unable to provide reliable operation, reduce battery performance and so on

Active Publication Date: 2008-04-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This chemical safety measure has the advantage of being applicable to various batteries without requiring additional installation process and space, but it has the problem of not providing reliable operation and degrading battery performance due to the addition of materials

Method used

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  • Lithium secondary battery having improved stability to overcharge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In N-methyl-2-pyrrolidone (NMP) as a solvent, 93% carbon active material (MCMB10-28, Osaka Gas Co.) and 7% polyvinylidene fluoride (PVDF) were mixed using a stirrer (IKAMixer). (Kynar 761, Elf Atochem) was mixed for two hours, and the resulting mixture was coated on a copper foil current collector, followed by drying at 130° C., thereby preparing an anode.

[0048] 1% by weight of polyurethane with a molecular weight of 42,000 to 45,000, added to 91% LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2, 3% PVDF (Kynar 761) and a mixture of 6% conductive carbon (KS-6, Lonza), and using a stirrer (IKA Mixer) to mix the resulting components in N-methyl-2-pyrrolidone (NMP ) for two hours, the resulting mixture was coated on an aluminum foil current collector, and then dried at 130° C., thereby preparing a cathode. The polyurethane is prepared by suspending polymerization of polyethylene glycol (PEG) as a polyol compound and toluene diisocyanate (TDI) as an isocyanate compound.

[0049] Then a s...

Embodiment 2

[0051] A battery was fabricated in the same manner as in Example 1 except that 3% by weight of polyurethane was added to the cathode.

Embodiment 3

[0053] A battery was fabricated in the same manner as in Example 1 except that 10% by weight of polyurethane was added to the cathode.

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Abstract

Disclosed is a lithium secondary battery comprising an electrode assembly composed of a cathode, an anode and a separator, and a lithium electrolyte, wherein the electrodes and / or electrolyte include a compound (''urethane compound'') and / or polymer (''poly urethane'') which are decomposed upon overcharge of the battery and contain a urethane group in a molecular structure thereof. The lithium secondary battery of the present invention is characterized by addition of a compound or polymer having a urethane group to electrodes and / or electrolyte, wherein the thus-added compound and / or polymer have substantially no adverse effects on general performance of the battery under normal operating conditions and are decomposed with high reliability upon overcharge of the battery, thereby offering time delay effects for securing battery safety, and the decomposition products thereof result in sharply increased internal resistance of the battery, thereby increasing battery safety.

Description

technical field [0001] The present invention relates to a lithium secondary battery having improved overcharge safety. More specifically, the present invention relates to a lithium secondary battery having significantly improved overcharge safety, and by adding a compound or a polymer having a carbamate group to an electrode and / or an electrolyte, under ordinary operating conditions There is minimal adverse effect on the overall performance of the battery. Background technique [0002] The technological development and increasing demand for mobile devices has led to a rapid increase in the demand for secondary batteries as energy sources. Among these secondary batteries, much research has been directed to lithium secondary batteries having high energy density and high discharge voltage, and some of such lithium secondary batteries are commercially available and widely used. [0003] However, when a large amount of current flows in a short period of time due to various fact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60
CPCH01M10/4235H01M10/0567Y02E60/122H01M10/052H01M4/62Y02E60/10H01M4/60H01M10/05
Inventor 金甫炫刘光虎朴炫佑朴慧雄刘智相
Owner LG ENERGY SOLUTION LTD
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