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A secondary battery with improved safety

A battery, lithium battery technology, applied in the direction of lithium battery, non-aqueous electrolyte battery, non-aqueous electrolyte battery electrode, etc., can solve problems such as battery fire and explosion

Inactive Publication Date: 2009-11-11
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above-mentioned cathode active materials with higher potentials relative to lithium are used alone, once a short circuit occurs in the battery due to internal or external conditions, electrons and lithium ions rapidly migrate from the anode to the cathode, generating a large amount of Instantaneous current, which will cause rapid heat generation in the battery, thereby causing problems such as battery fire or explosion

Method used

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  • A secondary battery with improved safety
  • A secondary battery with improved safety
  • A secondary battery with improved safety

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Using LiCoO 2 (conductivity: 10 -2 S / cm; specific surface area: 0.2m 2 / g;D 50 = 5-20 μm; potential with respect to Li / Li+ = 3.8-4.2V) As the first lithium-containing metal composite oxide, LiFePO 4 (conductivity: 10 -2 to 10 -4 S / cm (for LFP coated with carbon); specific surface area: 13m 2 / g;D 50 =0.5-5μm; relative to Li / Li + Potential = 3.4-3.5V; ΔP = 0.3-0.8V) As the second lithium-containing metal composite oxide, two oxides were mixed with each other in a weight ratio of 80:20. Add the obtained oxide mixture, conductive agent and binder into NMP (N-methyl-2-pyrrolidone) to prepare cathode slurry. The slurry was then coated on an aluminum (Al) current collector to make a cathode.

[0062] The graphite material as the anode active material and the binder are added into the NMP to prepare the anode slurry. The anode slurry was then coated on a copper (Cu) current collector to make an anode.

[0063] Use 1M LiPF 6 EC / EMC (1:2 v / v) solution was used as ele...

Embodiment 2

[0066] Cells were prepared in the same manner as described in Example 1, with the only difference being the LiCoO used 2 and LiFePO 4 The weight ratio is not 80:20, but 85:15.

Embodiment 3

[0068] Cells were prepared in the same manner as described in Example 1, with the only difference being the LiCoO used 2 and LiFePO 4 The weight ratio is not 80:20, but 90:10.

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Abstract

The present invention provides a cathode comprising two or more lithium-containing metal composite oxides, having different potentials versus lithium (Li / Li+) and different impedances, the cathode comprising: (a) a first lithium-containing metal composite oxide; and (b) a second lithium-containing metal composite oxide, which has a high impedance and low potential versus lithium (Li / Li+), compared to those of the first lithium-containing metal composite oxide. In the invention, two or more lithium-containing metal composite oxides are used in combination as cathode components in a battery, whereby, when a short circuit occurs in the battery, the instantaneous flow of a large amount of current can be minimized and, at the same time, the accumulation of heat in the battery can be reduced, thus ensuring the safety of the battery.

Description

technical field [0001] The present invention relates to a storage battery in which a large amount of instantaneous current and lithium ion flow generated in the event of a short circuit can be suppressed, thereby ensuring superior safety of the battery. Background technique [0002] In recent years, electronic devices having a light and compact structure have been developed, and applications of portable electronic devices have gradually become popular. Therefore, secondary batteries with high energy density have been actively researched. A lithium secondary battery includes a cathode and an anode made of a material capable of intercalating and deintercalating lithium ions, the secondary battery is prepared by injecting an organic electrolyte or a polymer electrolyte between the cathode and the anode, and through oxidation and reduction The reactions provide electrical energy, and the oxidation and reduction reactions occur when intercalation and deintercalation of lithium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/13H01M4/525H01M4/58H01M10/0525
CPCH01M4/5825Y02E60/122H01M4/625H01M4/525H01M4/13H01M4/366H01M4/364H01M10/0525H01M4/131H01M4/48H01M10/052Y10T29/49108Y02E60/10Y02P70/50H01M4/02H01M4/36H01M10/02
Inventor 朴必圭朴永善吴丙薰金寄泰李明训李宰源
Owner LG CHEM LTD
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