A sulfur cathode composite material based on porous biomass carbon and a preparation method thereof

A biomass carbon and composite material technology, applied in the direction of active material electrodes, positive electrodes, battery electrodes, etc., can solve the problems of waste of biomass resources, backward preservation and conversion technology, etc., achieve high sulfur loading, expand the scope of application, The effect of improving specific capacity and cycle stability

Inactive Publication Date: 2019-01-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] my country is rich in biomass resources, but due to the backward preservation and transformation technology, the waste of biomass resources is serious

Method used

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  • A sulfur cathode composite material based on porous biomass carbon and a preparation method thereof
  • A sulfur cathode composite material based on porous biomass carbon and a preparation method thereof
  • A sulfur cathode composite material based on porous biomass carbon and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Put the enucleated Panda Dahai in a high-pressure reactor, and conduct a hydrothermal reaction at 180°C for 12 h. The hydrothermal reaction product was filtered, dried, and ground; then, the ground powder was mixed with 5 M KOH ethanol solution and stirred for 18 h, wherein The mass ratio of the added powder to KOH was 1:3, and then the mixture was poured into a nickel crucible, dried at 80 °C, and calcined at 800 °C for 2 h under the protection of an argon atmosphere; finally, the calcined product was washed with 1 M dilute hydrochloric acid and Wash with deionized water until neutral and dry to obtain a porous biomass carbon material.

[0030] to combine figure 1 and figure 2 It can be seen that the prepared porous biomass carbon material has a developed three-dimensional mesopore-macropore hierarchical porous structure, and the specific surface area is as high as 1784.79 m 2 / g.

[0031] 2. Mix the porous biomass carbon material prepared in step 1 with 50 mg...

Embodiment 2

[0043] The preparation method of this example is the same as Example 1, except that the argon atmosphere in all steps is adjusted to helium atmosphere protection, and other implementation conditions remain unchanged. Compared with Example 1, the specific capacity and cycle stability of the battery assembled with the porous biomass carbon-based sulfur cathode composite prepared in this example remained basically unchanged, and the initial discharge capacity was as high as 1220 mAh / g at 0.5 C , 823 mAh / g is still maintained after 100 cycles.

Embodiment 3

[0045] The preparation method of this example is the same as that of Example 1, except that the hydrothermal temperature in all steps 1 is 180 °C, the hydrothermal time is 18 h, the calcination temperature for carbonization activation is 900 °C, and other implementation conditions remain unchanged. Compared with Example 1, the specific capacity and cycle stability of the battery assembled with the porous biomass carbon-based sulfur cathode composite prepared in this example were slightly reduced, and the initial discharge capacity was 1177 mAh / g at 0.5 C, and the cycle 100 laps still maintain 769 mAh / g.

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Abstract

The invention belongs to the technical field of energy storage materials, in particular to a sulfur positive electrode composite material based on porous biomass carbon and a preparation method thereof. The porous biomass carbon was prepared from denucleated Sterculia Lychnophora by the hydrothermal and carbonization activation method. Then nitrogen and sulfur were doped into porous biomass carbonby high temperature calcination with thiourea as nitrogen and sulfur source. Then nitrogen and sulfur doped porous biomass carbon and sulfur are melton and composited; Finally, a sulfur cathode composite based on porous biomass carbon was obtained by coating conductive polyaniline on the surface of porous biomass carbon / sulfur composite. The sulfur positive electrode composite material prepared by the invention is used for assembling and testing the battery performance, and the initial discharge capacity at 0.5 C is up to 1227 mAh / g which is maintained at 818 mAh / g after 100 cycles, and the capacity retention rate is 66.7%.

Description

technical field [0001] The invention belongs to the field of energy storage materials and technologies, and in particular relates to a sulfur cathode composite material based on porous biomass carbon and a preparation method thereof. Background technique [0002] In order to meet the growing demand for energy and high-performance energy storage devices, it has become a common goal for researchers at home and abroad to develop a new generation of high-energy density, environmentally friendly, safe and inexpensive battery materials and technologies. Lithium-sulfur battery is a new type of secondary battery with sulfur as the positive electrode active material and metal lithium as the negative electrode. Benefiting from the multi-electron reaction of lithium-sulfur electrochemical pairs and the low electrochemical equivalent of elemental sulfur, lithium-sulfur batteries have up to 1675 mAh g -1 and 2600 Wh kg -1 The theoretical specific capacity and specific energy are severa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/624H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 刘家琴吴健吴迪许俊张琪胡颖吴玉程
Owner HEFEI UNIV OF TECH
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