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Lithium-sulfur battery positive electrode material

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of reducing the conductivity of sulfur body, dosage and dispersion affecting the electrochemical performance of lithium-sulfur batteries, etc., to improve the electrochemical performance of lithium-sulfur batteries. performance, improving the sulfur loading of electrodes, and the effect of good practical application prospects

Active Publication Date: 2020-03-27
NINGBO UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, metal oxides generally reduce the conductivity of sulfur hosts, and the amount and dispersion of metal oxides also affect the electrochemical performance of lithium-sulfur batteries.

Method used

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Embodiment Construction

[0025] Below in conjunction with embodiment the present invention is described in further detail.

[0026] The lithium-sulfur battery positive electrode material of this embodiment, the formulation of the lithium-sulfur battery positive electrode material is 0.1-2 parts of Ni, 0.4-8 parts of GDC, 25-60 parts of C and 40-75 parts of S, wherein the molecular formula of GDC is Ce 1-x Gd x o 2-δ , said parts are parts by weight.

[0027] GDC is a solid solution synthesized by cerium salt and gadolinium oxide, and the molecular formula of gadolinium oxide is Gd 2 o 3 . The specific method for the synthesis of cerium salt and gadolinium oxide is to use one or more of the sol-gel method, co-precipitation method, solid-phase method, and hydrothermal method to prepare the GDC precursor by mixing cerium salt and gadolinium oxide. The GDC precursor is heated at a temperature of 300-500° C. to obtain a powdery solid solution. The particle diameter of the solid solution is 15-50nm. ...

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Abstract

The invention relates to a lithium-sulfur battery positive electrode material, which belongs to the technical field of lithium battery production. The formula of the lithium-sulfur battery positive electrode material is, by weight, 0.1-2 parts of Ni, 0.4-8 parts of GDC, 25-60 parts of C, and 40-75 parts of S. The molecular formula of GDC is Ce<1-x>Gd<x>O<2-delta>. GDC is a GDC precursor prepared by mixing cerium salt and gadolinium oxide through one or more of a sol-gel method, a coprecipitation method, a solid phase method and a hydrothermal method, and then the GDC precursor is heated at thetemperature of 300-500 DEG C to prepare a powdery solid solution. The lithium-sulfur battery positive electrode material has the advantages that the GDC can inhibit the shuttle effect of polysulfideand improve the catalytic performance of the positive electrode material of the lithium-sulfur battery on oxidation reduction, Ni and the GDC can be combined to have relatively high electronic conductivity and ion vacancy, and the conductivity of the positive electrode material of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the technical field of making lithium batteries, in particular to a lithium-sulfur battery cathode material. Background technique [0002] With the rapid development of new energy technologies, the limit energy density of lithium-ion batteries has been difficult to meet the needs of future large-capacity energy storage technology, and lithium-sulfur batteries are due to their high theoretical specific capacity, high energy density, low price of elemental sulfur and environmental protection. It is considered to be the most promising energy storage device because of its friendliness and other characteristics. However, the commercialization of lithium-sulfur batteries is limited by some disadvantages of this battery, such as the poor electrical conductivity of sulfur, the "shuttle effect" of polysulfide intermediates, low sulfur loading, large volume expansion, and complex internal reaction mechanisms. Wait. [0003] In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/626H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 邹亚杰王琴郑道光
Owner NINGBO UNIV
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