Lithium-sulfur rechargeable battery

A lithium-sulfur secondary battery and graphene layer technology, applied in the field of electrochemistry, can solve problems such as poor stability or capacity characteristics, and achieve overcoming poor battery performance stability, inhibiting side reactions, and inhibiting polysulfide migration. Effect

Inactive Publication Date: 2015-02-18
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

These attempts have suppressed the diffusion of polysulfides to some extent, but their stability or capacity characteristics are still not good

Method used

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  • Lithium-sulfur rechargeable battery

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Effect test

Embodiment 1

[0019] Embodiment 1: the graphene material with a thickness of 0.8 nanometers directly grown by chemical vapor deposition is used as an intermediate layer alone, and it is attached to one side of the positive electrode material of a polyethylene diaphragm, wherein the oxygen content of the graphene material is 0%. The intermediate layer is used in a lithium-sulfur secondary battery to realize electronic insulation and lithium ion selective permeability at the same time, so that lithium ions migrate smoothly in the system, while polysulfide anions are confined to the positive electrode side. At the same time, the sulfur / activated carbon composite material is used as the positive electrode, the lithium metal sheet is used as the negative electrode, and the 1,3-dioxane and 1,2-dimethoxyethane solution of lithium bis(trifluoromethylsulfonyl)imide are used as the The electrolyte is used to make lithium-sulfur secondary batteries. At a charge-discharge rate of 0.01C, the initial cap...

Embodiment 2

[0020] Embodiment 2: graphene oxide is separately formed into an intermediate layer with a thickness of 500 nanometers, wherein the oxygen content of the graphene material is 50%. The intermediate layer realizes electronic insulation and cation selective permeability at the same time, so that lithium ions migrate smoothly in the system, while polysulfide anions are partially confined on the positive electrode side. At the same time, the sulfur / carbon black composite material in the aluminum foam network is used as the positive electrode, the graphene oxide intermediate layer is attached to the surface of the positive electrode material, the metal lithium sheet is used as the negative electrode, and the 1,3-dioxane of tetraethylammonium tetrafluoroborate is used as the positive electrode. , 1,2-dimethoxyethane solution as electrolyte to make lithium-sulfur secondary battery. At a charge-discharge rate of 0.4C, the initial capacity of the battery using the ion-selective diaphrag...

Embodiment 3

[0021] Embodiment 3: Graphene oxide and foam metal nickel framework are used to form an intermediate layer with a thickness of 1000 microns to limit the diffusion of polysulfides. At the same time, the sulfur / mesoporous carbon composite material is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the ethylene glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide and lithium nitrate is used as the electrolyte to make a lithium-sulfur secondary battery. , the interlayer is located between the separator and the negative electrode of the battery. At a charge-discharge rate of 1.5C, the initial capacity of the battery using the ion-selective diaphragm reaches 863mAh / g, and the decay rate of the first 100 cycles is about 0.05%, which is much lower than that of the lithium-sulfur battery using the ordinary diaphragm (about 0.30%) .

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Abstract

The invention relates to a lithium-sulfur rechargeable battery, in particular to a lithium-sulfur rechargeable battery with a graphene or graphene oxide interlayer, and belongs to the technical field of electrochemistry. An ion selective function is realized by the graphene or graphene oxide interlayer, and the defect of the original lithium-sulfur battery that the diffusion of polysulfide between an anode and a cathode causes low charging and discharging efficiency and poor battery performance stability is overcome. The selective transmission of lithium ions can be realized, and a novel solution is expected to be provided for effectively inhibiting lithium-sulfur battery technical obstacles, such as polysulfide migration. The use of the lithium-sulfur rechargeable battery in combination with a high-capacity anode material contributes to boosting of the sulfur functionalization of the lithium-sulfur rechargeable battery.

Description

field of invention [0001] The invention relates to a lithium-sulfur secondary battery, in particular to a lithium-sulfur secondary battery with an intermediate layer of graphene or graphene oxide, belonging to the technical field of electrochemistry. Background technique [0002] With the development of the modern electronics industry and the continuous improvement of people's performance requirements for electronic equipment, the energy density requirements for energy storage devices in modern society are also rising. On the other hand, the voice of gradually using clean energy to replace traditional fossil energy has also attracted more and more attention to high-performance battery devices. [0003] Lithium-sulfur batteries, as a typical high-energy-density electrochemical system, have attracted extensive attention from academia and industry in recent years. Sulfur is a positive electrode material with high theoretical specific capacity, the theoretical capacity can reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M2/16H01M50/46
CPCH01M10/36H01M50/431Y02E60/10
Inventor 黄佳琦庄汀洲张强彭翃杰
Owner TSINGHUA UNIV
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