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Lithium secondary battery anode and lithium secondary battery including same

A technology of lithium secondary battery and negative electrode, which is applied to the field of negative electrode for lithium secondary battery and lithium secondary battery including the same, can solve the problems of electrolyte loss, loss, battery driving process not continuing, etc.

Active Publication Date: 2018-01-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the volume change of the electrodes during repeated charging and discharging of the battery, loss and depletion of the electrolyte may occur, thereby causing a problem that the battery driving process does not continue

Method used

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  • Lithium secondary battery anode and lithium secondary battery including same
  • Lithium secondary battery anode and lithium secondary battery including same
  • Lithium secondary battery anode and lithium secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0124] [Preparation Example 1: Preparation of Negative Electrode]

Embodiment 1

[0126] The Sylgard 184 monomer purchased from Dow Corning is mixed with the hardener in a weight ratio of 10:1 to 10:5. In order to control the thickness to a level of 1 to 10um, hexane was added to dilute the mixture to reduce the concentration. The solution thus prepared is applied on the lithium metal thin film, and then thermally cured at 50 to 100° C. for 1 to 12 hours. At this time, the higher the temperature, the shorter the curing time.

Embodiment 2

[0128] A sol-gel reaction is performed on a single monomer having the following formula 1 to form polysilsesquioxane.

[0129] [Formula 1]

[0130]

[0131] (In Equation 1, R 1 Is oligoethylene glycol)

[0132] The prepared polysilsesquioxane was dissolved in THF in an amount of 10% by weight to obtain a composition for forming a polymer matrix. The composition was applied on a lithium metal thin film as a negative electrode active layer, and then cured at 100°C to form a polymer matrix.

[0133] At this time, the curing time and degree of curing can be shortened by changing the solvent to alcohol or by adding acid or alkali to the solution, in which considering the reactivity of lithium, it can be cured on another substrate such as Teflon sheet or PET sheet The composition is then transferred to a thin lithium film.

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Abstract

The present invention relates to a lithium secondary battery anode and a lithium secondary battery including the same, the anode comprising: an anode active layer containing lithium; and a protectivelayer located above the anode active layer, wherein the protective layer includes: a polymer matrix including a three-dimensional cross-linked network structure of a polymer, or including a non-cross-linked linear polymer; and an electrolyte contained in the polymer matrix, the electrolyte being 100 to 1000 parts by weight with respect to 100 parts by weight of the polymer matrix, whereby there isno risk of electrolyte loss and consequential reduction in battery life characteristic even when a battery is repeatedly charged and discharged, and the dendrite growth of lithium is restricted, thereby enhancing battery safety.

Description

Technical field [0001] The present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery containing the same. The negative electrode has no concern about electrolyte loss and therefore deterioration of battery life characteristics even during repeated charge and discharge of the battery, and due to suppression The growth of lithium dendrites has improved stability. Background technique [0002] Lithium secondary batteries (such as lithium ion batteries), nickel-hydrogen batteries, and other secondary batteries are becoming more and more important as power sources for vehicles or as power sources for portable devices such as notebook computers. In particular, a lithium secondary battery that can obtain high energy density and is light in weight can be preferably used as an on-vehicle high-output power source, and therefore it is expected that the demand will continue to increase in the future. [0003] Lithium secondary batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/139H01M10/052C08G77/16
CPCH01M10/052H01M4/1395H01M4/366H01M4/382H01M4/623C08G77/16H01M4/134H01M4/622Y02E60/10H01M50/103H01M4/139H01M4/0407H01M4/485H01M4/525H01M4/5815H01M4/661H01M4/666H01M4/667H01M4/668H01M2004/027H01M2300/0042
Inventor 金泽京张民哲孙炳国梁斗景
Owner LG ENERGY SOLUTION LTD