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Defective metal oxide/porous carbon nanocomposite material and its preparation method and application

A technology of composite materials and oxides, applied in the direction of non-aqueous electrolyte batteries, structural parts, electrical components, etc., can solve the problem of low utilization rate of active materials, and achieve the effects of efficient use of cycle life, accelerated industrialization, and high cycle life

Active Publication Date: 2022-07-05
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0004] In order to solve the problems in the above-mentioned prior art, the present invention provides a defective metal oxide / porous nano-carbon composite material, the defective metal oxide / porous nano-carbon composite material is regulated by ions, and the Defective metal oxides are compounded on nitrogen-sulfur double-doped porous nano-carbon, so that when it is applied to lithium-sulfur batteries, it overcomes the problem of low utilization of active materials in lithium-sulfur batteries and shows more excellent electrochemical performance. performance, especially during rapid charge and discharge

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  • Defective metal oxide/porous carbon nanocomposite material and its preparation method and application
  • Defective metal oxide/porous carbon nanocomposite material and its preparation method and application
  • Defective metal oxide/porous carbon nanocomposite material and its preparation method and application

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preparation example Construction

[0038] The invention also discloses a preparation method of the above-mentioned defective metal oxide / porous nano carbon composite material, which comprises the following steps:

[0039] In step S1, a nanocarbonaceous aqueous solution is prepared.

[0040] Specifically, the concentration of the nanocarbonaceous aqueous solution does not exceed 2 mg / mL, and the solute nanocarbonaceous material can be at least one of oxidized carbon nanotubes and derivatives thereof, graphene oxide, and carbon nanofibers. It should be noted that, if there are at least two types of solute nanocarbons, the above-mentioned concentration refers to the total concentration.

[0041] Generally speaking, a relatively high-concentration nano-carbonaceous stock solution can be prepared first, then diluted with ultrapure water, and effectively sonicated for about 30 minutes using a cell sonicator to form the above-mentioned low-concentration nano-carbonaceous aqueous solution.

[0042] In order to make th...

Embodiment 1

[0053] First, a certain amount of prepared carbonaceous nano-stock solution with a concentration of 7.5 mg / mL was added, diluted with ultrapure water, and effectively sonicated for about 30 min with a cell sonicator to obtain a carbonaceous nano-water solution with a concentration of 1 mg / mL.

[0054] In this embodiment, the nano carbonaceous stock solution is specifically a graphene oxide stock solution.

[0055] Secondly, adding a sulfur source precursor, a nitrogen source precursor and a metal ion source precursor to the nano carbonaceous aqueous solution, and uniformly dispersing to obtain a hydrothermal reactant.

[0056] In this embodiment, the sulfur source precursor is sodium sulfide, the nitrogen source precursor is ammonia water, and the metal ion source precursor is a 10wt% ferrous acetate solution; and the mass of sulfur element in the sulfur source precursor is nanocarbonaceous 20 wt % of the mass of the nano-carbon in the aqueous solution, the mass of the nitroge...

Embodiment 2

[0062] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between Example 2 and Example 1 is only that, when preparing the nano-carbonaceous aqueous solution, first preparing a graphene oxide stoste of 7.5 mg / mL with a certain concentration, then adding and graphite oxide to this graphene oxide stoste. Carbon oxide nanotubes of the same quality as ethylene, then add ultrapure water to dilute and use a cell sonicator to effectively sonicate for about 30 minutes to obtain a mixed aqueous solution of carbon oxide nanotubes and graphene oxide with a concentration of 1 mg / mL; and, control the hydrothermal The temperature is 200°C, and the hydrothermal time is 12h; for the rest, refer to Example 1 to obtain the defective metal oxide / porous nanocarbon composite material FeO of this example. x -SNGC.

[0063] That is, in the defect metal oxide / porous carbon nano...

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Abstract

The invention discloses a highly active defective metal oxide / porous nano carbon composite material, which comprises nitrogen-sulfur double-doped porous nano carbon and an oxygen-deficient metal oxide supported on the porous nano carbon. The defective metal oxide / porous carbon nanocomposite material utilizes ion regulation to directly composite the defective metal oxide onto the nitrogen-sulfur double-doped porous carbonaceous nanomaterials in one step, so that it can be applied to high energy density lithium In sulfur batteries, the problem of low utilization rate of active materials in lithium-sulfur batteries is overcome, and the conductivity of lithium ions in solid phase and the heterogeneous catalytic conversion ability of polysulfides are improved, so that when it is applied to electrodes, The efficient utilization and high cycle life of the sulfur cathode show more excellent electrochemical performance, which can achieve the goal of fast charge and discharge. The invention also discloses the preparation method of the above-mentioned defective metal oxide / porous nano carbon composite material and its application in the energy storage device.

Description

technical field [0001] The invention belongs to the technical field of electrode materials and preparation thereof, and in particular, relates to a defective metal oxide / porous nano-carbon composite material and a preparation method thereof, as well as the application of the defective metal oxide / porous nano-carbon composite material in energy storage application in the file. Background technique [0002] Although lithium-sulfur batteries have high volume energy density and mass energy density, they may be used in large energy storage devices and power grids in the future, such as electric vehicles; however, lithium-sulfur batteries have some problems, such as active material sulfur and electron ions of lithium sulfide. Insulation, lithium polysulfide dissolution and migration, volume expansion and contraction and other problems. At present, the actual energy density of lithium-sulfur batteries is much lower than its theoretical energy density, and the cycle life is poor. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052
CPCH01M4/366H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 张跃钢王健
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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