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A metal lithium negative electrode with an organic-inorganic double protective layer

A double protection, metal lithium technology, applied in the field of electrochemistry, can solve the problems of poor cycle performance, uneven deposition of metal lithium, low coulombic efficiency, etc., to achieve high adhesion, conducive to uniform deposition, and improve the effect of Coulombic efficiency

Active Publication Date: 2019-12-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low coulombic efficiency, poor cycle performance and safety caused by the uneven deposition of lithium metal caused by the side reaction between metal lithium and electrolyte, and the formation of lithium dendrites. Metal lithium anode with protective layer

Method used

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  • A metal lithium negative electrode with an organic-inorganic double protective layer
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  • A metal lithium negative electrode with an organic-inorganic double protective layer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 0.6 g , 0.39 g of ethyl methacrylate and 10 mg of trihydroxypropionitrile were dissolved in 10 mL of acetone solution, sealed and stirred at room temperature for 6 h to completely dissolve and form a uniform solution. In the glove box, the solution was evenly scraped and coated on the surface of the metal lithium sheet, and the esters were polymerized to form an organic layer under the action of the surface hydroxyl groups, and then dried in the glove box for 10 h to completely remove the acetone, and at the same time, the polymer and trihydroxypropionitrile After contacting with lithium metal, a layer containing Li is formed at the interface 3 N. Li x NO y Inorganic layer, thus forming an organic-inorganic double protective layer on the surface of the metal lithium negative electrode.

[0029] LiFePO 4 as the positive electrode, with LiPF 6 / EC: DMC (1:1) is the electrolyte, and the battery is assembled with unprotected metal lithium and metal lithium with a prot...

Embodiment 2

[0031] 0.8 g , 0.19 g of glycidyl methacrylate and 10 mg of succinonitrile were dissolved in 10 mL of acetone solution, sealed and stirred at room temperature for 6 h to completely dissolve to form a uniform solution. In the glove box, the solution was evenly sprayed on the surface of the metal lithium sheet, polymerized to form a polymer film under the action of the surface hydroxyl groups, and then dried in the glove box for 10 h to completely remove acetone, while the polymer and succinonitrile were mixed with the metal lithium After contact, a layer containing Li is formed at the interface 3 N. Li x NO y Inorganic layer, thus forming an organic-inorganic double protective layer on the surface of the metal lithium negative electrode.

[0032] LiCoO 2 as the positive electrode, with LiPF 6 / EC: DMC (1:1) is the electrolyte, and the battery is assembled with unprotected metal lithium and metal lithium with a protective layer as the negative electrode. The battery perfo...

Embodiment 3

[0034] 0.58 g , 0.4 g methyl methacrylate and 20 mg urea were dissolved in 10 mL of acetone solution, sealed and stirred at room temperature for 6 h to completely dissolve to form a uniform solution. In the glove box, the solution was uniformly scraped and coated on the surface of the metal lithium sheet, and polymerized to form a polymer film under the action of the surface hydroxyl group, and then dried in the glove box for 10 h to completely remove the acetone. A Li-containing layer is formed at the interface 3 N. Li x NO y Inorganic layer, thus forming an organic-inorganic double protective layer on the surface of the metal lithium negative electrode.

[0035] A battery was assembled with S as the positive electrode, LiTFSI / DOL:DME (1:1) as the electrolyte, and unprotected metal lithium and metal lithium with a protective layer as the negative electrode. The battery performance is shown in Table 3.

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Abstract

The invention relates to a metal lithium negative electrode with organic and inorganic dual protection layers. The invention belongs to the technical field of electrochemistry, and relates to the metal lithium negative electrode with the organic and inorganic dual protection layers and application of the metal lithium negative electrode in a secondary lithium battery. The protection layers are characterized in that an organic protection layer is built on a surface of the metal lithium negative electrode from one or more of acrylate containing amino, cyan, nitro or nitroso, one or more of acrylic organic matters except several types of the acrylates and one or more of small molecule compounds containing nitrogen, meanwhile, a nitrogen-containing part in the organic layer reacts with metal lithium to form an inorganic protection layer at an interface in an in-situ way, so that the organic and inorganic dual protection layers are formed. When the metal lithium negative electrode with the protection layers is applied to a lithium battery, the coulombic efficiency of the battery can be effectively improved by a synergistic effect of the organic layer and the inorganic layer, the growth of lithium dendrites is prevented, the safety problem is improved, and the cycle lifetime is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a metal lithium negative electrode with an organic-inorganic double protective layer, a preparation method thereof and an application in a lithium secondary battery. Background technique [0002] Lithium-ion batteries, as current commercial energy storage devices, have been widely used in daily life due to their high voltage and energy density. With the rapid development of mobile electronic devices, the requirements for battery energy density are getting higher and higher. At the same time, the requirements for energy density, safety performance and cycle life of lithium-ion batteries have also been raised in the fields of electric vehicles, smart grids, and aerospace. challenge. At present, traditional lithium-ion batteries can no longer meet the needs of society. Therefore, it is necessary to develop next-generation lithium batteries with high safety, high energy densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/1395
CPCH01M4/134H01M4/1395H01M4/366H01M4/382H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 崔光磊张舒王庆富胡正林董杉木徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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