Electrode for lithium secondary battery

a lithium secondary battery and electrode technology, applied in the field of electrodes, can solve the problems of increasing the viscosity of the electrolyte, affecting the performance of the battery at a low temperature, and the diffusion of li ions cannot be smoothly made under extreme conditions, so as to increase the irreversible capacity, reduce the risk of li ions being released, and improve the effect of battery performan

Active Publication Date: 2013-10-24
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a battery with improved safety and performance. It achieves this by incorporating an aliphatic dinitrile compound into the electrodes of a battery. The aliphatic nitrile compound only contributes to the formation of a complex with the electrode active material, protecting it from side reactions with the electrolyte and preventing the formation of a resistance layer that can detract from battery performance. The coated electrodes have strong protection surfaces that stabilize the transition metal and transition metal oxide present on the surface of the electrode active material, preventing partial release of the transition metal from the electrode active material during repeated charge / discharge cycles. The compound also prevents exothermic reactions and ignition / explosion resulting from high temperatures inside the battery. The use of the compound does not cause degradation in battery performance and allows for efficient lithium ion intercalation / deintercalation without varying viscosity of the electrolyte or affecting ion conductivity. The electrodes coated with the compound can also inhibit thermal runaway and improve safety of batteries even when using flammable non-aqueous organic solvents as electrolytes.

Problems solved by technology

Meanwhile, we have also recognized a problem in that when an aliphatic dinitrile compound is used as an additive for electrolyte, there is an increase in viscosity of the electrolyte so that diffusion of Li ions cannot be made smoothly under extreme conditions (a low temperature of between −20° C. and −10° C.)
, resulting in degradation of battery performance at a low temperature.

Method used

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  • Electrode for lithium secondary battery
  • Electrode for lithium secondary battery
  • Electrode for lithium secondary battery

Examples

Experimental program
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Effect test

example 1

[0062]Succinonitrile was diluted with acetone as a solvent in the weight ratio of 3:7 to provide a solution, into which a cathode was dipped. Then, the cathode was high-temperature treated at 30° C. for 2 days to evaporate the solvent, thereby providing a cathode comprising succinocitrile forming a complex with the surface of cathode active material. The cathode active material was LiCoO2. Artificial graphite was used as an anode active material. The electrolyte used in this example was 1M LiPF6 solution formed of EC:PC:DEC=3:2:5. A 383562-type lithium polymer battery was manufactured by using a conventional method and the battery was packed with an aluminum laminate packaging material to provide a battery pack. Next, the battery was aged by treating it again at a high temperature of 60° C. for 12 hours or more so that any unreacted and / or residual succinonitrile in the electrode can form a complex.

examples 2-8

[0063]Example 1 was repeated to provide lithium polymer batteries, except that glutaronitrile (R═C3H6) (Example 2), adiponitrile (R═C4H8) (Example 3), pimelonitrile (R═C5H10) (Example 4), octanedinitrile (R═C6H12) (Example 5), azelonitrile (R═C7H14) (Example 6), sebaconitrile (R═C8H16) (Example 7) and dodecanedinitrile (R═C10H20) (Example 8) were used, instead of succinonitrile (R═C2H4).

example 9

[0066]A cathode was dipped into a solution containing succinonitrile (R═C2H4) in a acetone as a solvent, and then was high-temperature treated at 30° C. for 2 days to evaporate the solvent, thereby providing a cathode comprising 3-5 wt % of succinocitrile, based on the weight of electrolyte, forming a complex with the surface of cathode active material. The cathode active material was LiCoO2. The electrolyte used in this example was 1M LiPF6 solution formed of EC:EMC=1:2. Artificial graphite was used as an anode active material. A 523450-type prismatic lithium battery was manufactured by using a conventional method. Next, the battery was aged by treating it again at a high temperature of 60° C. for 12 hours or more so that any unreacted and / or residual succinonitrile in the electrode can form a complex.

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Abstract

Disclosed is a method for forming an electrode comprising a protective layer, which comprises: dispersing or dissolving an aliphatic nitrile compound into a solvent to provide a coating solution; coating a surface of the electrode with the coating solution, said electrode having an electrode active material coated thereon; and removing the solvent used in the coating solution by drying to form a protective layer comprising an aliphatic nitrile compound-electrode active material complex.

Description

[0001]This application is a Continuation of co-pending U.S. application Ser. No. 11 / 056,290, filed Feb. 11, 2005. This application also claims priority under U.S.C. 119(a) to Patent Application No. 10-2004-100700 filed in Republic of Korea on Feb. 16, 2004. The entire contents of the above applications are hereby incorporated by reference into the present application.TECHNICAL FIELD[0002]The present invention relates to an electrode including an aliphatic nitrile compound. More particularly, the present invention relates to an electrode whose surface is coated with an aliphatic nitrile compound or which comprises an electrode active material comprising an aliphatic nitrile compound, as well as to a lithium secondary battery having the same electrode.BACKGROUND ART[0003]In general, a non-aqueous electrolyte comprising a lithium salt such as LiPF6 and a carbonate solvent reacts continuously with the surface of a cathode active material (particularly, LiCoO2) during repeated charge / dis...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/62H01M4/139H01M4/04H01M6/16H01M10/40H01M10/42
CPCH01M4/628H01M4/0419H01M4/139H01M4/0402H01M4/0404H01M4/62H01M10/0525H01M10/0567H01M10/4235H01M2300/004Y02E60/10A47G23/06B65D1/34B65D81/245
Inventor KIM, YOUNG SOOAHN, SOON HO
Owner LG ENERGY SOLUTION LTD
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