Graphene-based protection layer on surface of metal lithium anode and corresponding lithium-sulfur battery

A lithium metal anode and alkenyl protective layer technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to suppress side reactions, fragility, and high brittleness, and achieve improved Coulombic efficiency and cycle stability. Sexuality, prevention of side effects, strong practicability

Active Publication Date: 2018-04-17
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the protective film formed in situ by this electrolyte additive on the surface of the lithium anode is generally weak in strength, and will be repeatedly destroyed and regenerated during the lithium deposition and dissolution process, which cannot inhibit the formation of lithium dendrites and prevent the electrolyte from forming on the lithium anode. The effect of side reactions on the surface
Another strategy is to deposit or sputter a layer of solid electrolyte film material with lithium ion conductivity on the surface of the lithium anode. This film material is generally an inorganic ceramic material, but the disadvantage is that it is relatively brittle and the processing and manufacturing process is complicated. , it is easy to break during the battery charge and discharge process and use, resulting in failure of the protective layer

Method used

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  • Graphene-based protection layer on surface of metal lithium anode and corresponding lithium-sulfur battery
  • Graphene-based protection layer on surface of metal lithium anode and corresponding lithium-sulfur battery
  • Graphene-based protection layer on surface of metal lithium anode and corresponding lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 0.5g of chemically reduced graphene powder, 0.2g of nano-silicon powder, 0.2g of sulfur element, 0.1g of polyoxyethylene (average molecular weight 3 million) and disperse in 10ml of tetrahydrofuran to obtain a uniform slurry, and protect the above slurry in an inert atmosphere. Uniformly coated on the surface of the lithium metal anode, heat treatment at 50°C until the solvent is evaporated to dryness to obtain a graphene-based composite coating attached to the surface of the lithium anode, the thickness of the coating is 15 microns. Using the above-mentioned lithium anode with a graphene-based composite coating, assemble a battery with the sulfur-carbon cathode and diaphragm in Comparative Example 1, and add the electrolyte used in Comparative Example 1. The battery cycle data such as Figure 4As shown, the battery was cycled for 3 weeks at a rate of 0.05C, and the capacity was 1112mAh / g; after 20 weeks at a rate of 0.1C, the capacity was 857mAh / g, and the capacit...

Embodiment 2

[0032] Take 0.1g of heat-reduced graphene powder, 0.6g of sulfur elemental substance, 0.1g of stannous oxide powder, and 0.2g of polyvinylidene fluoride, and disperse them in 10ml of polyvinylpyrrolidone to obtain a uniform slurry, which is evenly coated on the comparative example 1 On the porous diaphragm used, the diaphragm coating was obtained after vacuum drying at 75°C, the thickness of the coating was 35 microns, and the diaphragm coating was rolled with lithium foil under the protection of an inert atmosphere to obtain a diaphragm-lithium composite anode, in which graphene-based The composite coating is between the separator and lithium anode. The above separator-lithium composite anode was assembled into a battery with the sulfur-carbon cathode described in Comparative Example 1, and the electrolyte used in Comparative Example 1 was added. The battery cycle data such as Figure 6 As shown, the battery was cycled at 0.05C rate for 12 weeks, and the capacity was 1381mAh...

Embodiment 3

[0034] Under the protection of an inert atmosphere, take 0.25g of heat-reduced graphene powder, 0.5g of phosphorus pentasulfide, 0.1g of stannous oxide powder, and 0.15g of polyvinylidene fluoride, and disperse them in 10ml of polyvinylpyrrolidone to obtain a uniform slurry. Coated on the porous diaphragm used in Comparative Example 1, dried at 75° C., and obtained a diaphragm coating after the solvent evaporated, and the thickness of the coating was 40 microns. Under the protection of an inert atmosphere, it is rolled with a lithium foil to obtain a separator-lithium composite anode, wherein the graphene-based composite coating is interposed between the separator and the lithium anode. The above separator-lithium composite anode was assembled into a battery with the sulfur-carbon cathode described in Comparative Example 1, and the electrolyte used in Comparative Example 1 was added. The battery cycle data such as Figure 6 As shown, the battery was cycled at 0.05C rate for 1...

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Abstract

The invention discloses a graphene-based protection layer on the surface of a metal lithium anode and a corresponding lithium-sulfur battery. A composite protection layer containing a graphene material is built on the surface of a metal lithium anode of a lithium-sulfur battery through in-situ electrochemical reaction. Materials required for preparing the protection layer are divided into inorganic compounds and organic polymer materials; a layered stack structure of the graphene in the protection layer is capable of inhibiting the lithium anode from generating lithium dendrites in repeated deposition and dissolution processes; and inorganic components between graphene sheets are subjected to in-situ electrochemical reaction with the lithium anode after being infiltrated through an electrolyte to form a lithium ion channel between graphene layers, thereby isolating the contact of the lithium anode and the electrolyte and playing a role in protecting a cathode. Relatively high capacitydeveloping performance and stable cycle performance can be obtained through applying the lithium anode with the graphene-based protection layer to a lithium-sulfur battery system.

Description

technical field [0001] The invention relates to a graphene-based protective layer on the surface of a lithium metal anode and a lithium-sulfur battery system using the lithium anode. Background technique [0002] The lithium-sulfur battery system uses metal lithium as the anode and elemental sulfur as the cathode. The theoretical energy density of the system is as high as 2600Wh / kg, which is 5 to 8 times that of lithium-ion batteries. At present, the energy density of its commercial devices has reached 350Wh / kg, and Sulfur is a common industrial waste, which has the advantages of non-toxicity, large reserves, low price, and environmental friendliness. Therefore, this system is expected to become a new generation of energy storage system after lithium-ion batteries, and it will be applied to vehicle power batteries, 3C electronics, etc. products etc. In recent years, relevant research work and reports on lithium-sulfur battery systems have been very active, and related indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62
CPCH01M4/628H01M10/0525Y02E60/10
Inventor 魏志凯闫新秀叶长英瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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