Lithium-sulfur battery positive electrode composite material based on biomass carbon source as well as preparation method and application of lithium-sulfur battery positive electrode composite material

A biomass carbon source and composite material technology, applied in the field of lithium-sulfur battery positive electrode, can solve the problems of reducing battery coulombic efficiency, corrosion of metal lithium negative electrode, and increasing electrolyte viscosity, so as to improve the capture effect, enhance electron exchange, and improve catalysis. performance effect

Pending Publication Date: 2022-05-06
SUZHOU RES INST SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The "shuttle effect" not only reduces the Coulombic efficiency of the battery, but also causes problems such as corrosion of the met

Method used

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  • Lithium-sulfur battery positive electrode composite material based on biomass carbon source as well as preparation method and application of lithium-sulfur battery positive electrode composite material
  • Lithium-sulfur battery positive electrode composite material based on biomass carbon source as well as preparation method and application of lithium-sulfur battery positive electrode composite material
  • Lithium-sulfur battery positive electrode composite material based on biomass carbon source as well as preparation method and application of lithium-sulfur battery positive electrode composite material

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Example

[0050] First embodiment

[0051] 1. The invention relates to a lithium sulfur battery cathode composite material based on biomass carbon source and a preparation method and application thereof, which comprises the following steps:

[0052] (1) The sun dried corn straw is peeled and cut into equal length segments (about 3cm), washed with deionized water for many times, and then dried in an 80 ℃ blast drying oven overnight.

[0053] (2) Add 5mm FeCl into the beaker containing 200ml deionized water respectively 3 ·6H 2 O and 5mm (NH) 4 ) 2 HPO 4 , stir for 1h to form a light yellow turbidity. After immersing the dried corn straw section for 12h, take it out and dry it in an 80 ℃ blast drying oven overnight.

[0054] (3) Put the dried sample into the tubular furnace, under the protection of AR, at 2 ℃ for min -1 The heating rate was increased to 900 ℃ and kept for 2h, and then cooled to room temperature with the furnace to obtain porous carbon sheet / iron phosphide / iron metaphospha...

Example

[0062] Second embodiment

[0063] 1. The invention relates to a lithium sulfur battery cathode composite material based on biomass carbon source and a preparation method and application thereof, which comprises the following steps:

[0064] (1) Pour the freshly squeezed sugarcane juice and deionized water into a beaker according to the volume ratio of 1:5, stir evenly, and then filter to remove sugarcane residue. Take 600ml of uniform mixture and add it into 1L Teflon lined reactor. Transfer the reactor to a 160 ℃ blast drying oven, keep it warm for 6h, and then cool it to room temperature to obtain brownish red liquid. The brownish red suspension was centrifuged, the separated samples were washed with deionized water and alcohol for three times, and dried by blowing at 60 ℃ overnight to obtain the precursor of biomass carbon microspheres.

[0065] (2) 0.6g of carbon microsphere precursor was added to the prepared 30ml 2m CO (no 3 ) 3 In the solution (the solvent is deionized wate...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode composite material based on a biomass carbon source and a preparation method and application thereof, and belongs to the technical field of lithium-sulfur battery positive electrodes. Comprising a porous carbon body prepared on the basis of biomass and nano transition metal phosphide/phosphorus oxide grown on the porous carbon body in situ. The positive electrode composite material can be used for preparing a positive electrode of a lithium-sulfur battery after being subjected to sulfur loading, a precursor prepared after biomass pretreatment is soaked in a solution containing transition metal salt or a mixed solution of transition metal salt and phosphorus-containing salt, and a solid product is separated out after the precursor reacts with the solution; and performing high-temperature carbonization, pore forming and partial atmosphere treatment on the solid product to obtain the porous carbon composite material embedded with the nano transition metal phosphide.

Description

technical field [0001] The invention provides a lithium-sulfur battery positive electrode composite material based on a biomass carbon source, a preparation method and application thereof, and belongs to the technical field of lithium-sulfur battery positive electrodes. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-sulfur batteries use sulfur element and metal lithium as the positive and negative active materials of the battery, and the theoretical specific capacity of the positive electrode is high (1675mAh g -1 ). Lithium-sulfur battery has the advantages of light weight, large capacity, environmental friendliness and easy availability of raw materials, etc.,...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCH01M4/624H01M4/628H01M10/052B82Y30/00B82Y40/00H01M2004/028H01M2004/021
Inventor 胡成陈传忠李旭婷
Owner SUZHOU RES INST SHANDONG UNIV
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