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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

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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  • Summary
  • Abstract
  • 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 metal lithium negative electrode and an increase in the viscosity of the electrolyte, which deteriorates the performance of the battery.

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

Examples

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no. 1 example

[0051] 1. A lithium-sulfur battery cathode composite material based on a biomass carbon source and its preparation method and application, comprising the following steps:

[0052] (1) Peel the dried corn stalks and cut them into small pieces (about 3 cm) of equal length, wash them with deionized water several times, and then put them in an air-blast drying oven at 80°C to dry overnight.

[0053] (2) Add 5mM FeCl to a beaker containing 200mL of deionized water 3 ·6H 2 O and 5mM (NH 4 ) 2 HPO 4 , stirred for 1 h to form a light yellow cloudy liquid. After immersing the dried corn stalks for 12 hours, take them out and put them in an air blast drying oven at 80° C. to dry overnight.

[0054] (3) Put the dried sample into a tube furnace, under the protection of Ar, at 2°C min -1 The heating rate was increased to 900 °C, and kept for 2 hours, then cooled to room temperature with the furnace, and the porous carbon sheet / iron phosphide / iron metaphosphate composite material (PCS...

no. 2 example

[0063] 1. A lithium-sulfur battery cathode composite material based on a biomass carbon source and its preparation method and application, comprising the following steps:

[0064] (1) Pour freshly squeezed sugarcane juice and deionized water into a large beaker at a volume ratio of 1:5, stir evenly, and then filter to remove sugarcane residue. Take 600 mL of the homogeneous mixture and add it to a 1 L Teflon-lined reaction kettle. The reaction kettle was transferred to a blast drying oven at 160° C., kept warm for 6 hours, and then cooled to room temperature to obtain a brownish-red liquid. The brownish-red suspension was centrifuged, and the separated sample was washed three times with deionized water and alcohol, respectively, and dried overnight at 60° C. to obtain a precursor of biomass carbon microspheres.

[0065] (2) Add 0.6g carbon microsphere precursor to the prepared 30mL 2M Co(NO 3 ) 3 In the solution (the solvent is deionized water and alcohol with a volume rati...

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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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