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Negative electrode for lithium metal battery and lithium metal battery comprising the same

A technology for lithium metal electrodes and lithium metal batteries, which is applied in the field of negative electrodes for lithium metal batteries and lithium metal batteries including them, and can solve problems such as reduced lifespan and stability

Active Publication Date: 2017-11-17
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a lithium secondary battery including such a lithium metal thin film may have reduced lifetime and stability

Method used

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  • Negative electrode for lithium metal battery and lithium metal battery comprising the same
  • Negative electrode for lithium metal battery and lithium metal battery comprising the same
  • Negative electrode for lithium metal battery and lithium metal battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0302] Embodiment 1: the manufacture of negative electrode

[0303] Poly(styrene-b-divinylbenzene) block copolymer microspheres (with an average particle diameter of about 3 μm, EPR-PSD-3, available from EPRUI Nanoparticles & Microparticles Co., Ltd.) were added to anhydrous tetrahydrofuran A mixture comprising 5% by weight of block copolymer is obtained.

[0304] The block copolymers in the mixture comprising block copolymers comprise polystyrene blocks and polydivinylbenzene blocks in a mixing ratio of about 9:1 by weight, and the poly(styrene The -b-divinylbenzene) block copolymer has a weight average molecular weight of about 100,000 Daltons.

[0305] Lithium bis(fluorosulfonyl)imide (LiFSI, LiN(SO 2 F) 2 ) is added to the mixture comprising the block copolymer to obtain a protective layer forming composition. The amount of LiFSI is about 30 parts by weight based on 100 parts by weight of the poly(styrene-b-divinylbenzene) copolymer.

[0306] The composition for for...

Embodiment 2 and 3

[0309] Examples 2 and 3: Manufacture of Negative Electrode

[0310] Negative electrodes were fabricated in the same manner as in Example 1, except that the thicknesses of the protective layers were changed to about 1 μm and about 8 μm, respectively.

Embodiment 4

[0311] Embodiment 4: the manufacture of negative electrode and lithium metal battery

[0312] A negative electrode was fabricated in the same manner as in Example 1. The negative electrode has a protective layer comprising microspheres on a lithium metal thin film and a cross-linked material of DEGDA in the interstices between the microspheres. The amount of crosslinking material of DEGDA is about 20 parts by weight based on 100 parts by weight of the poly(styrene-b-divinylbenzene) block copolymer microspheres.

[0313] LiCoO 2 , a conductive agent (Super-P; Timcal Ltd.), polyvinylidene fluoride (PVdF), and N-methylpyrrolidone were mixed together to obtain a composition for forming a positive electrode active material layer. LiCoO in the composition for forming the positive electrode active material layer 2 , conductive agent, and PVdF in a mixing weight ratio of about 97:1.5:1.5. Relative to 97g of LiCoO 2 , the amount of N-methylpyrrolidone was about 137 g.

[0314] ...

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Abstract

A negative electrode for a lithium metal battery, the negative electrode including: a lithium metal electrode comprising lithium metal or a lithium metal alloy; and a protective layer on at least a portion of the lithium metal electrode, wherein the protective layer has a Young's modulus of about 106 Pascals or greater, wherein the protective layer includes at least one first particle, wherein the first particle includes an organic particle, an inorganic particle, an organic-inorganic particle, or a combination thereof, and wherein the first particle has a particle size of greater than 1 micrometer to about 100 micrometers, and a crosslinked material comprising a polymerizable oligomer, which is disposed between first particles of the at least one first particle.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2016-0056612 filed on May 9, 2016 and Korean Patent Application No. 10-2017-0056261 filed on May 2, 2017 at the Korean Intellectual Property Office, The disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present disclosure relates to a negative electrode for a lithium metal battery and a lithium metal battery including the negative electrode. Background technique [0004] Lithium secondary batteries are high-performance batteries having the highest energy density among currently available secondary batteries, and are applicable to various fields such as electric vehicles. [0005] A lithium secondary battery may use a lithium thin film as a negative electrode. When thin lithium metal is used as the anode, the anode may be highly reactive with the liquid electrolyte during charge or discharge due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052
CPCH01M4/13H01M4/62H01M10/052H01M4/1395H01M4/366H01M4/622H01M4/382H01M4/405Y02E60/10H01M4/134H01M10/0568H01M10/4235H01M10/0565H01M2004/027H01M2220/20H01M2004/021Y02T10/70C08K3/30C09D4/06H01M4/525H01M4/628H01M10/0525H01M10/0569H01M2300/0034H01M2300/0037
Inventor 李龙键S.柳杉本敏规张元硕
Owner SAMSUNG ELECTRONICS CO LTD
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