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Positive electrode material of lithium sulfur battery, preparation method of positive electrode material and lithium sulfur battery containing positive electrode material

A technology for lithium-sulfur batteries and cathode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of fast capacitance decay and short cycle life, and achieve high production efficiency, low cost, and improved environment Effects of Pollution Problems

Active Publication Date: 2017-02-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At a current density of 0.1C, the lithium-sulfur battery has an initial discharge capacity of 1045.6mAh / g, and after 100 cycles, the discharge capacity is maintained at 776.6mAh / g, and its energy density is only 29.8% of the theoretical value. Sulfur batteries have the disadvantages of fast capacitance decay and short cycle life.

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  • Positive electrode material of lithium sulfur battery, preparation method of positive electrode material and lithium sulfur battery containing positive electrode material
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  • Positive electrode material of lithium sulfur battery, preparation method of positive electrode material and lithium sulfur battery containing positive electrode material

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preparation example Construction

[0053] As mentioned above, the present invention provides a positive electrode material for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery containing the positive electrode material.

[0054] Specifically, the present invention provides a method for preparing a positive electrode material for a lithium-sulfur battery, wherein the positive electrode material is a carbon / metal oxide / sulfur ternary composite material (referred to as S / metal oxide@C); The ternary composite material is prepared by a hydrothermal method, wherein carbon-containing biomass material (specifically such as yeast) is used as a carbon precursor. Further, a metal salt is used as a metal oxide precursor.

[0055] In a preferred embodiment of the present invention, described method comprises the following steps:

[0056] 1) Using yeast and metal salts as raw materials, an amorphous carbon-metal ion complex is prepared by hydrothermal method, which is recorded as intermed...

Embodiment 1

[0085] S / MnO 2 @C

[0086] 1. The preparation method of the ternary composite positive electrode material: the carbon precursor yeast and the metal oxide precursor MnCl 2 Mix according to the mass ratio of 1:0.05, the specific operation steps are as follows: wash 4g of yeast with deionized water, disperse in 40mL of deionized water, add 2g of sodium chloride, 100μL of glutaraldehyde and 0.2g of metal oxide Precursor MnCl 2 , put into a 100mL beaker and stir evenly. Transfer the above solution into a polytetrafluoroethylene-lined autoclave and react at 180°C for 8 hours. After the reaction, collect it by centrifugation and wash it with water for 3 times and ethanol for 3 times. The collected precipitate is put into an oven for 45 ℃ drying for 8h, to obtain the intermediate product a. After cooling to room temperature, it was placed in a tube furnace under an inert atmosphere at 900°C for 6 hours to obtain the intermediate product b (denoted as MnO 2@C). After cooling and ...

Embodiment 2

[0097] S / ZnO@C

[0098] 1. The preparation method of the ternary composite positive electrode material: mix the carbon precursor yeast and the metal oxide precursor zinc acetate according to the mass ratio of 1:0.1. Wash and disperse in 40mL deionized water, add 2g sodium chloride, 100μL glutaraldehyde and 0.4g metal oxide precursor zinc acetate, put into a 100mL beaker and stir at room temperature for 30min to disperse evenly. Transfer the above solution into a polytetrafluoroethylene-lined autoclave and react at 200°C for 6 hours. After the reaction, collect it by centrifugation and wash it with water for 3 times and ethanol for 3 times. The collected precipitate is put into an oven for 80 ℃ dry 4h. The intermediate product a is obtained. Cool to room temperature and put it into a tube furnace under an inert atmosphere at 700°C for 4 hours to obtain intermediate product b. After it is cooled and weighed, add sulfur according to the mass ratio of carbon / metal oxide to sulf...

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Abstract

The invention discloses a positive electrode material, a preparation method thereof and a lithium sulfur battery containing the positive electrode material. The positive electrode material uses yeast bacteria as a carbon precursor (namely a carbon source), in-situ trapping on metal ions is realized by adsorbing the metal ions in a hydrothermal carbonizing process, and a carbon skeleton material obtained after high-temperature heat treatment is used for filling elemental sulfur. A porous carbon / metal oxide / sulfur (namely S / metal oxide@C (carbon)) with a three-dimensional nanometer structure can effectively adsorb polysulfide ions in the circulating process of the lithium sulfur battery, the relevant capacity loss is inhibited, and the composite material has higher charging and discharging capacity and cyclic life. The positive electrode material has the advantages that the preparation method is simple, the implementing is easy, the cost is low, and the obvious practical value and application value are realized.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a positive electrode material for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery containing the positive electrode material. Background technique [0002] Lithium-ion secondary battery is a new type of green energy developed in the 1990s. It is favored because of its excellent performance such as high reversible capacity, high voltage, high cycle performance and high energy density. It is currently the leading power source for practical use. . High energy density has always been one of the themes in the research and development of secondary batteries, among which lithium-sulfur battery (Li-S battery) is one of the secondary battery systems under development with higher energy density. Lithium-sulfur batteries generally use elemental sulfur or sulfur-containing materials as positive electrode active materials, and thei...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 曹安民张天麒万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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