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A method for preparing a honeycomb lithium sulfide battery positive electrode material by a template method

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve problems such as difficult to control volume expansion, uneven distribution of carbon-sulfur, etc., achieve volume expansion elimination, high dispersion uniformity, The effect of increasing energy density

Inactive Publication Date: 2019-01-11
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the shortcomings of the existing lithium-sulfur battery cathode materials, such as uneven distribution of carbon-sulfur and difficulty in controlling volume expansion, the present invention proposes a method for preparing a honeycomb lithium-sulfur battery cathode material by a template method, and obtains a honeycomb lithium-sulfur battery cathode material through preparation , to limit the escape of polysulfides generated after the reaction of sulfur atoms, and at the same time eliminate the volume expansion caused by the redox reaction of sulfur atoms

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  • A method for preparing a honeycomb lithium sulfide battery positive electrode material by a template method

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Embodiment 1

[0029] (1) Weigh 8 parts by mass of tetraethyl orthosilicate, 0.4 parts by mass of butanol, 15 parts by mass of sodium sulfide, 45 parts by mass of polytetrafluoroethylene emulsion containing carbon nanotubes and appropriate amount of deionized water, pH Control the aqueous solution of hydrochloric acid and hydrofluoric acid at 2.0;

[0030](2) Mix the dilute acid solution and the dispersant into the reaction vessel, control the concentration of the dispersant to 0.04mol / L, stir evenly, raise the temperature to 62°C, and dissolve ethyl orthosilicate at 1.5-2 Add it dropwise into the reactor within 1 hour to obtain the reaction precursor solution, then raise the temperature of the reaction precursor solution to 70°C, keep it warm for 1.6 hours, then cool it down to 25°C, shake the test tube forward and backward for 180 seconds, discharge the material for later use, and obtain a particle size of 30 μm, porosity 55%, mesopore average pore diameter 180nm monodisperse hollow mesopo...

Embodiment 2

[0034] (1) Weigh 5 parts by mass of tetraethyl orthosilicate, 0.5 parts by mass of butyl acetate as a dispersant, 12 parts by mass of sodium sulfide, 69 parts by mass of polytetrafluoroethylene emulsion containing carbon nanotubes and an appropriate amount of deionized Water, pH value controlled at 2.0 aqueous solution of glacial acetic acid and hydrofluoric acid;

[0035] (2) Mix the dilute acid solution and the dispersant into the reaction vessel, control the concentration of the dispersant to 0.09mol / L, stir evenly, raise the temperature to 60°C, and dissolve ethyl orthosilicate within 1.7 hours Add it dropwise into the reactor to obtain the reaction precursor solution, then raise the temperature of the reaction precursor solution to 70°C, keep it warm for 3 hours, then lower the temperature to 20°C, shake the test tube forward and backward for 350 seconds, discharge the material for later use, and obtain a particle size of 10 μm. The porosity is 75%, and the average pore s...

Embodiment 3

[0039] (1) Weigh 8 parts by mass of tetraethyl orthosilicate, 0.1 parts by mass of ether as a dispersant, 17 parts by mass of sodium sulfide, 60 parts by mass of polytetrafluoroethylene emulsion containing carbon nanotubes and an appropriate amount of deionized water, The pH value is controlled at 3.0 in aqueous solution of hydrochloric acid and hydrofluoric acid;

[0040] (2) Mix the dilute acid solution and the dispersant into the reaction vessel, control the concentration of the dispersant to 0.07mol / L, stir evenly, raise the temperature to 60°C, and dissolve ethyl orthosilicate within 1.7 hours Add it dropwise into the reactor to obtain the reaction precursor solution, then raise the temperature of the reaction precursor solution to 71°C, keep it warm for 2 hours, then cool it down to 25°C, shake the test tube forward and backward for 200 seconds, discharge the material for later use, and obtain a particle size of 35 μm. The porosity is 65%, and the average pore size of th...

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Abstract

The invention provides a method for preparing a honeycomb lithium sulfur battery positive electrode material by a template method, wherein sulfur simple substance is obtained in a hollow silicon oxidemicrosphere, the silicon oxide microsphere is self-assembled on a monocrystalline silicon wafer as a template, a carbon layer is grown on the surface of the template, and the template is removed to obtain a honeycomb lithium sulfur battery positive electrode material. As that template, sulfur is load inside the silicon oxide, as that elemental sulfur is uniformly disper in the pores of the poroucarbon material after the porous carbon material is grown, the escape of the polysulfide formed after the reaction of sulfur atoms is restricted through the honeycomb-like pores of the porous carbon,and the volume expansion caused by the redox reaction of sulfur atoms can be eliminated, thereby overcoming the shortcomings of the existing lithium-sulfur battery positive electrode material carbon-Sulfur distribution is uneven and volume expansion is difficult to control, which improves the performance of lithium sulfur batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing anode materials for honeycomb lithium-sulfur batteries by a template method. Background technique [0002] Lithium-ion batteries are currently the battery system with the best performance among commercial secondary batteries, but due to their main use, the theoretical capacity generally does not exceed 300mAhg -1 LiFeO 4 、LiCoO 2 and LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 As cathode materials, it is difficult to meet the current demand for high specific energy batteries, and the development of cathode materials with high theoretical specific capacity has become the focus of current research. [0003] Lithium-sulfur batteries have a very high theoretical capacity, and the theoretical specific capacity of the material and the theoretical specific energy of the battery reach 1672m Ah·g, respectively. -1 and 2600Wh·kg -1 At present, the actual energy den...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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