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Lithium metal with rigid-elastic interface layer as well as preparation method and application of lithium metal

An interface layer, lithium metal technology, applied in the direction of climate sustainability, final product manufacturing, sustainable manufacturing/processing, etc., to achieve the effect of inhibiting lithium dendrites, high mechanical strength, fast and stable deposition/stripping behavior

Pending Publication Date: 2020-03-24
四川创微致尚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problem that the existing lithium metal negative electrode protective layer in the background technology cannot have both good mechanical properties and good electrochemical properties, the purpose of the present invention is to provide a lithium metal negative electrode with a rigid-elastic interface layer and its preparation method and application, by electrochemically depositing diallyl disulfide (DADS) on the surface of lithium by in-situ electrochemical method, and forming an inorganic-polymer structure, so that lithium metal has both rigid and elastic interfacial layers

Method used

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Embodiment 1

[0033] A preparation method of lithium metal with a rigid-elastic interfacial layer, comprising the following steps:

[0034] Step 1. Mix LiTFSI and DOL / DME with a volume ratio of 1:1 so that the concentration of LiTFSI is 1mol / L, then add 10mg DADS to the 190mg mixed solution to prepare solution A;

[0035] Step 2. Put ordinary lithium metal, diaphragm, ordinary lithium metal, gasket, shrapnel, and negative electrode shell on the positive shell of the button battery in sequence, and add 30 μL of solution A obtained in step 1 as electrolyte to the battery, and put it in the glove Assembled into a button-type symmetrical battery in the box;

[0036] Step 3. For the button cell obtained in step 2, at 1mAcm -2 The lithium metal with the rigid-elastic interface layer can be obtained by charging under current for 5 hours for deposition. After the deposition, the battery is disassembled, the lithium electrode is taken out, and washed repeatedly with DOL.

Embodiment 2

[0038] Lithium metal with a rigid-elastic interface layer was prepared according to the preparation method of Example 1, only the deposition time in step 3 was adjusted to 10 h, and other steps were kept unchanged.

Embodiment 3

[0040]Lithium metal with a rigid-elastic interface layer was prepared according to the preparation method of Example 1, only the deposition time in step 3 was adjusted to 15 h, and other steps were kept unchanged.

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Abstract

The invention provides lithium metal with a rigid-elastic interface layer as well as a preparation method and application of the lithium metal, and belongs to the field of lithium metal batteries. Diallyl disulfide (DADS) is electrochemically deposited on the surface of lithium metal in situ to form an inorganic-polymer structure, so that the lithium metal has a rigid-elastic interface layer at the same time. The polymer network improves the elasticity and toughness of the interface layer, and the formed inorganic unit can provide higher mechanical strength to resist the damage of lithium dendrites. Therefore, the interface layer not only can inhibit the formation of lithium dendrites, but also can enable the deposition / stripping behavior of lithium to be carried out more quickly and stably.

Description

technical field [0001] The invention belongs to the field of lithium metal batteries, and in particular relates to a lithium metal negative electrode with a rigid-elastic interface layer and a preparation method and application thereof. Background technique [0002] Lithium metal has a large theoretical capacity (3860mAh g -1 ), low reduction potential (-3.04V / standard hydrogen electrode), low weight density (0.534g cm -3 ) and other characteristics, it has become an irreplaceable negative electrode material for the next generation of rechargeable batteries. However, for its practical application, two fundamental challenges need to be addressed: (1) high activity and irreversible reactions between Li metal and organic electrolytes, which lead to low Coulombic efficiency and short cycle life of batteries; (2) The irregular lithium deposition / stripping behavior leads to the generation of lithium dendrites, although a solid electrolyte interface (SEI) is formed on the negativ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/42H01M10/058H01M4/1395
CPCH01M4/62H01M4/628H01M10/4235H01M10/058H01M4/1395Y02E60/10Y02P70/50
Inventor 晏成林于淼章琛
Owner 四川创微致尚科技有限公司
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