Lithium-sulfur battery cathode material and preparation method thereof, lithium-sulfur battery cathode and lithium-sulfur battery

A technology for lithium-sulfur batteries and positive electrode materials, which is applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc. It can solve the problems of small specific surface area of ​​nano-particle materials, unfavorable inhibition of polysulfides, and difficult control of the reaction process. Achieve the effect of excellent electrochemical performance, low cost and high porosity

Active Publication Date: 2017-02-22
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nanoparticle material prepared by the above method has a small specific surface area and less pore structure, which is not conducive to inhibiting the dissolution of polysulfides; at the same time, the cost of metal alkoxides in the sol-gel method is high, and the reaction process of the self-propagating high-temperature synthesis method is difficult to control. and other shortcomings

Method used

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  • Lithium-sulfur battery cathode material and preparation method thereof, lithium-sulfur battery cathode and lithium-sulfur battery
  • Lithium-sulfur battery cathode material and preparation method thereof, lithium-sulfur battery cathode and lithium-sulfur battery
  • Lithium-sulfur battery cathode material and preparation method thereof, lithium-sulfur battery cathode and lithium-sulfur battery

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Embodiment 1

[0038] A cathode material for a lithium-sulfur battery of the present invention, which is made of metal oxide micro-nanotubes and sulfur composites, the diameter of the metal oxide micro-nanotubes is between 400-700nm, the length is 10μm-15μm, and the hollow part is connected with the micro-nanotubes. The diameter ratio of the tube is 0.1-0.2:1; the main component of the metal oxide micro-nano tube is Mg 0.6 Ni 0.4 O.

[0039] The above-mentioned preparation method of lithium-sulfur battery cathode material comprises the following steps:

[0040] 1) Add 3 g of polyacrylonitrile (average molecular weight of polyacrylonitrile is 150,000) into 20 ml of N,N-dimethylacetamide, fully dissolve at room temperature for 12 hours, and obtain solution A;

[0041] 2) Add 1.54g of magnesium nitrate and 1.16g of nickel nitrate to 10ml of N,N-dimethylacetamide, ultrasonically disperse for 30 minutes, and dissolve the metal salt in the N,N-dimethylacetamide solution to obtain a solution B; ...

Embodiment 2

[0050] A lithium-sulfur battery positive electrode material of the present invention is made of metal oxide micro-nanotubes and sulfur composites, the diameter of the composite metal oxide micro-nanotubes is 200nm, and the diameter ratio of the hollow part to the metal oxide micro-nanotubes is 0.3~0.6:1, the length is 20μm~50μm, the main component of composite metal oxide is Mg 0.8 Cu 0.2 O.

[0051] The above Mg 0.8 Cu 0.2 The preparation method of O nanotube, comprises the following steps:

[0052] (1) Add 3 g of polyacrylonitrile (the average molecular weight of polyacrylonitrile is 150,000) into 20 ml of N,N-dimethylacetamide, fully dissolve at room temperature for 12 hours, and obtain solution A;

[0053] (2) Add 2.05g of magnesium nitrate and 0.40g of copper acetate into 10ml of N,N-dimethylacetamide, ultrasonically disperse for 30 minutes, and dissolve the metal salt in the N,N-dimethylacetamide solution to obtain Solution B;

[0054] (3) Add solution B to solutio...

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Abstract

The invention discloses a cathode material of a lithium sulphur battery; the cathode material of the lithium sulphur battery is prepared by compounding a metal oxide micro-nano tube with sulphur; the diameter of the metal oxide micro-nano tube is 200-700 nm; the length of the metal oxide micro-nano tube is 10-50 mu m; and the diameter ratio of the hollow part of the metal oxide micro-nano tube to the metal oxide micro-nano tube is (0.1-0.6):1. The invention further provides a preparation method of the cathode material of the lithium sulphur battery, and a cathode of the lithium sulphur battery and the lithium sulphur battery prepared by using the cathode material of the lithium sulphur battery. The metal oxide micro-nano tube is added into the cathode material of the lithium sulphur battery disclosed by the invention. Compared with corresponding blocky or nano particles, the cathode material of the lithium sulphur battery has the advantages of being high in porosity, large in specific surface area and aperture, and is capable of inhibiting dissolution of polysulfide better and keeping the charging and discharging stability of the lithium sulphur battery.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof, a lithium-sulfur battery cathode and a lithium-sulfur battery. Background technique [0002] In recent years, the rapid development of the global economy has increased the demand for energy and the environmental pollution has become increasingly serious. The development of secondary batteries with high energy density, long cycle life, high safety, green environmental protection and low cost is of great significance in the field of new energy. . Lithium-sulfur battery is one of the secondary battery systems under development with high energy density. It uses elemental sulfur or sulfur-containing materials as the positive electrode active material. Its theoretical energy density reaches 2600Wh / kg, and it is rich in sulfur resources and environmentally friendly. , cheap and other advantages. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/13H01M10/052
CPCH01M4/13H01M4/38H01M4/48H01M4/58H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 姚山山沈湘黔唐豪景茂祥钱昕晔饶德伟习小明
Owner CHANGSHA RES INST OF MINING & METALLURGY
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