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Anode active material, anode comprising same, and lithium secondary battery

A negative electrode active material and active material technology, applied in the direction of secondary batteries, lithium batteries, active material electrodes, etc., can solve the problems of battery performance degradation, capacity drop, and efficiency reduction, and achieve the effect of lasting conductivity and improving life characteristics

Pending Publication Date: 2021-11-12
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is a problem that because a material having a high capacity undergoes an excessively large volume change during charge and discharge, an electrical short is caused in the electrode, and a thick and unstable solid electrolyte interface (SEI) in which grows and causes battery Phenomenon of performance degradation
[0009] However, the method of forming the carbon coating has the following problems: since the formation of the carbon coating requires a heating process, cracks are generated or the porosity is lowered in the silicon-based particles to lower the efficiency, and the method of using another conductive material has the following problems : As the amount of conductive material increases, the conductive material agglomerates
However, even if another polymer composite material is provided, it is not easy to control the volume change, but a problem may occur that the conductivity of the active material deteriorates, resulting in an increase in resistance and a decrease in the capacity retention of the battery
In addition, since the silicon-based particles are overcoated and lithium ions are not easily intercalated, there is a problem of capacity decline

Method used

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  • Anode active material, anode comprising same, and lithium secondary battery
  • Anode active material, anode comprising same, and lithium secondary battery
  • Anode active material, anode comprising same, and lithium secondary battery

Examples

Experimental program
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preparation example Construction

[0083] Figure 1~5 is a schematic diagram showing the method for preparing the negative electrode active material of the present invention.

[0084] refer to figure 1 , dispersing the conductive material 10 and the organic connector 20 in a solvent. The conductive material 10 and the organic connector 20 may be the same as the above-mentioned conductive material and organic connector.

[0085] Such as figure 1 As shown, because the conductive material 10 and the organic linker 20 are first dispersed in the solvent, the organic linker 20 can be effectively dispersed in the solvent, and at the same time, the conductive material 10 can be effectively dispersed (that is, dispersed) in the solvent , so that the hydrophobic groups in the conductive material 10 and the organic linker 20 can combine with each other through van der Waals attraction. When the conductive material and the organic connector are mixed with the following active material core, elastic unit, etc. without ...

Embodiment 1

[0130] Example 1: Si / PBA / SWCNT 1% - Crosslinked

[0131] 0.1 g of 1-pyrenebutyric acid (PBA) was dissolved in 100 g of N-methylpyrrolidone solvent. After adding 0.01 g of single-walled carbon nanotubes (SWCNTs) to the prepared solution, probe-type sonication was performed for 30 minutes. Next, 1 g of Si powder was added to the prepared solution, followed by ultrasonic treatment for 30 minutes and stirring for 1 hour. To the dispersion solution thus prepared, 0.2 g of toluene 2,4-diisocyanate-terminated poly(propylene glycol) was added as an elastic unit, followed by stirring at 80° C. for 24 hours.

[0132] In the above solution, the carboxylate group of PBA reacts with the hydroxyl group on the surface of the active material core and thus combines with it, and because the hydrophobic group (pyrene group) of PBA is combined with the conductive material through van der Waals attraction, the conductive material and the active material The surfaces of the material are connected...

Embodiment 2

[0135] Example 2: Si / PBA / SWCNT 0.1% - crosslinked

[0136] Except using 0.01 g (instead of 0.1 g in Example 1) of PBA, 0.001 g (instead of 0.01 g in Example 1) of SWCNT and 0.02 g (instead of 0.2 g in Example 1) of toluene 2 , Except for 4-diisocyanate-terminated poly(propylene glycol), the negative active material of Example 2 (Si / PBA / SWCNT 0.1%-crosslinked) was prepared in the same manner as in Example 1. Here, "SWCNT 0.1%" means that the content of SWCNT relative to the active material core (Si) is 0.1% by weight.

[0137] A negative electrode was prepared in the same manner as in Example 1 except for using the negative electrode active material prepared above.

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Abstract

The present invention provides an anode active material comprising: an active material core capable of adsorbing and dissolving lithium ions; a plurality of conductive materials located on the surface of the active material core; a plurality of organic linkers each including a hydrophobic group and a polar functional group bound to the hydrophobic group; and an elastic unit, wherein the elastic unit includes an elastic portion having two or more binding sites, and functional groups that are bound to the binding sites of the elastic portion and are capable of reacting with the polar functional groups of the organic linkers, one or more organic linkers among the plurality of organic linkers is linked to the conductive materials through the hydrophobic groups of the organic linkers, and the polar functional groups of the organic linkers are bound with functional groups on the surface of the active material core, or with the functional groups of the elastic unit.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2018-0158018 filed on December 10, 2018, the disclosure of which is hereby incorporated by reference in its entirety. [0003] The invention relates to a negative electrode active material, a negative electrode containing the negative electrode active material and a lithium secondary battery. More particularly, the present invention relates to: a negative electrode active material, wherein a conductive material is stably attached to a surface of the negative electrode active material through an organic linker; a negative electrode including the negative electrode active material; and a lithium secondary battery. Background technique [0004] Due to the rapid increase in the use of fossil fuels, the need to use alternative energy or clean energy continues to increase, and in accordance with this continuously increasing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/38H01M4/48H01M10/052
CPCY02E60/10H01M2004/027H01M4/366H01M4/386H01M4/387H01M4/483H01M4/134H01M4/131H01M4/622H01M10/0525H01M4/625H01M4/626H01M4/62H01M4/624H01M10/052H01M4/623
Inventor 权友涵李东灿严仁晟柳正宇李在宪金帝映
Owner LG ENERGY SOLUTION LTD