One-step in-situ preparation method of rGO/VS4/S compound as lithium sulfur battery cathode material

An in-situ preparation technology for lithium-sulfur batteries, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as the inability to meet the electrochemical performance requirements of sulfur cathodes, achieve the suppression of shuttle effects, and be easy to popularize and prepare The effect of simple method

Active Publication Date: 2019-04-05
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it still cannot meet the market's requirements for the electrochemical performance of sulfur cathodes.

Method used

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  • One-step in-situ preparation method of rGO/VS4/S compound as lithium sulfur battery cathode material
  • One-step in-situ preparation method of rGO/VS4/S compound as lithium sulfur battery cathode material
  • One-step in-situ preparation method of rGO/VS4/S compound as lithium sulfur battery cathode material

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preparation example Construction

[0031] In order to improve the conductivity and utilization rate of the sulfur cathode, suppress the "shuttle effect" of polysulfide ions in the charging and discharging process, and meet the market's needs for the electrochemical performance of the above-mentioned sulfur cathode, the present invention proposes a one-step method to prepare rGO / VS 4 / S composites as cathode materials for high-performance lithium-sulfur batteries. The preparation method comprises the following steps:

[0032] First, the stoichiometric ratio of vanadium source and sulfur source is added to the graphene oxide (GO) solution, so that the molar ratio of sulfur to vanadium element S / V>10, and an appropriate amount of oxidant is added, stirred evenly, and the above solution is added to the hydrothermal reaction Kettle, carry out hydrothermal reaction at a certain temperature, at this time S 2– oxidized to S by oxidant 2 2– , first generate VS on the rGO surface 4 , get rGO / VS 4 complex, while the ...

Embodiment 1

[0042] Embodiment 1rGO / VS 4 / S (S content 70%) complex

[0043] Weigh 0.3575g Na 3 VO 4 12H 2 O as vanadium source and 1.82g thioacetamide as sulfur source were added to 80mL graphene oxide (GO, 2mg / mL) solution so that the molar ratio of sulfur to vanadium was S / V=27, and 1mL HNO was added 3 As an oxidant, stir evenly, add the above solution into a hydrothermal reactor, and conduct a hydrothermal reaction at 160°C for 24 hours to prepare rGO / VS 4 / S complex, where rGO / VS 4 / S mass content ratio is about 15%: 15%: 70% wt., its XRD is as follows figure 1 .

Embodiment 2

[0046] Example 2: rGO / VS 4 / S (S content 85%) complex

[0047] Weigh 0.447g Na 3 VO 4 12H 2 O as vanadium source and 4.068g thioacetamide as sulfur source were added to 50mL graphene oxide (GO, 2mg / mL) solution so that the molar ratio of sulfur to vanadium was S / V=48, and 1mL H 2 o 2 As an oxidant, stir evenly, add the above solution into a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 160°C for 20 hours to prepare rGO / VS 4 / S complex, where rGO / VS 4 / S mass content ratio is about 5%: 10%: 85% wt., its SEM is as figure 2 .

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Abstract

The invention discloses a one-step in-situ preparation method of a rGO / VS4 / S compound as a lithium sulfur battery cathode material. The method comprises firstly adding a stoichiometric vanadium sourceand a sulfur source to a graphene oxide (GO) solution to make a molar ratio S / V of sulfur elements to vanadium elements greater than 10; adding an appropriate amount of oxidant, uniformly stirring the solution, adding the solution to a hydrothermal reaction kettle to perform a hydrothermal reaction at a certain temperature, wherein at this time, the S2- is oxidized by the oxidant into S22-; generating VS4 on the surface of rGO to obtain a rGO / VS4 compound; reacting the remaining S22 with the oxidant to generate an elementary substance S; depositing the elementary substance S on the voids or surface of the rGO / VS4 compound; and finally preparing the rGO / VS4 / S compound. Because both the rGO and the VS4 have high electron conductivity and the electronegativity VS4 can inhibit the shuttle effect of polysulfide ions, the rGO / VS4 / S compound can be used as a high-performance lithium-sulfur battery cathode material which has a high discharge specific capacity, can significantly improve the cycle life and fast discharge capacity of the sulfur cathode material, and accelerates the development of long-life, high-rate lithium-sulfur batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery rGO / VS 4 / S composite cathode material preparation method. Background technique [0002] The aggravation of energy crisis, environmental damage and other issues force people to pursue higher specific energy battery system. Traditional lithium-ion batteries have made slow progress in increasing energy density. The energy density of a general lithium-ion battery is about 150Wh Kg –1 , even if a lithium-rich layered compound with a high specific capacity is selected as the positive electrode material and a silicon-based negative electrode material, it is difficult to achieve a substantial increase in energy density. Scientists pointed out that the development of lightweight electrode materials and the search for multi-electron electrochemical reaction systems have become the key to improving the energy density of batteries. The lithium-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 侯配玉徐锡金
Owner UNIV OF JINAN
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