Additive for lithium secondary batteries

A lithium secondary battery, electrolyte technology, applied in the direction of secondary battery, lithium storage battery, secondary battery repair/maintenance, etc., can solve the problem of battery cycle characteristics decline, unable to obtain recovery capacity, etc., to improve battery safety, The effect of reducing the contact surface area and improving safety

Active Publication Date: 2007-05-09
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an additive with a reaction potential of about 4.6 V (such as CHP or BP) is used in a high-voltage battery with a charge cut-off voltage of 4.35 V or higher, the cycle characteristics of the battery may drop rapidly at room temperature and high temperature
In addition, this additive may be excessively decomposed under high-temperature storage conditions to form a thick insulating film, which prevents the movement of lithium ions on the positive electrode, so that no recovery capacity can be obtained.

Method used

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  • Additive for lithium secondary batteries
  • Additive for lithium secondary batteries
  • Additive for lithium secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1. The manufacture of a lithium secondary battery with a charge cut-off voltage of 4.35V

[0067] (production of positive electrode)

[0068] Mix 95wt% LiCoO with a particle size of 10μm 2 , 2.5wt% conductive agent and 2.5wt% binder to form a slurry. The slurry was uniformly applied on both surfaces of an aluminum foil with a thickness of 15 μm and then calendered to obtain an active material weight of 19.44 mg / cm 2 positive pole. The final positive electrode has a thickness of 128 μm.

[0069] (manufacture of negative electrode)

[0070] 4.0 wt% binder and 0.7 wt% conductive agent were added to 95.3 wt% graphite and mixed to form a slurry. The slurry was uniformly applied on both surfaces of a copper foil with a thickness of 10 μm, followed by calendering to obtain an active material weight of 9.56 mg / cm 2 the negative pole. The weight ratio (A / C) of the positive electrode active material to the negative electrode active material per unit area of ​​th...

Embodiment 2

[0075] Embodiment 2. The manufacture of a lithium secondary battery with a charge cut-off voltage of 4.2V

[0076] Repeat Example 1 to obtain a lithium secondary battery, except that the active material weight is 19.44 mg / cm 2 The weight of positive electrode (C) and active material is 8.56mg / cm 2 The weight ratio (A / C) of the negative electrode active material to the positive electrode active material per unit area of ​​each electrode was adjusted to 0.44.

Embodiment 3-10

[0078] Example 1 was repeated to obtain a lithium secondary battery except that a nitrile group-containing compound and a fluorotoluene compound were used as described in Table 1 below.

[0079] Nitrile-containing compounds (content)

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Abstract

Disclosed is a lithium secondary battery comprising a cathode (C), an anode (A), a separator and an electrolyte, wherein the electrolyte comprises: (a) a nitrile group containing compound and (b) a compound having a reaction potential of 4.7V or higher. The lithium secondary battery can prevent the problems caused by a nitrile group-containing compound added to the electrolyte for the purpose of improving high-temperature cycle characteristics and safety (such problems as a battery swelling phenomenon and a drop in recovery capacity under high-temperature (>80 DEG C) storage conditions), by adding a fluorotoluene compound.

Description

technical field [0001] The invention relates to a lithium secondary battery, preferably a high-voltage battery with a charging cut-off voltage exceeding 4.35V, which has improved high-temperature cycle characteristics, safety and high-temperature storage characteristics. More particularly, the present invention relates to a lithium secondary battery using an electrolytic solution composition comprising a compound having a reaction potential of 4.7 V or higher in addition to a compound containing a nitrile group, wherein the compound having a reaction potential of 4.7 V or higher solves the problem of The problem of battery swelling phenomenon and reduction of recovery capacity under high-temperature storage conditions is caused by nitrile-group-containing compounds used in electrolyte components to improve high-temperature cycle characteristics and safety. Background technique [0002] Recently, as electronic devices become smaller and lighter, batteries used as power source...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/24H01M10/0567H01M10/42
CPCH01M10/4235H01M2300/0048H01M10/0567Y02E60/122H01M4/133H01M2010/4292H01M10/052H01M2004/021H01M4/131Y02E60/10
Inventor 金东明尹种文金容呈赵范琎郑俊溶郑大俊裵峻晟
Owner LG ENERGY SOLUTION LTD
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