Nitrogen-doped porous carbon loaded metal cobalt material as well as preparation method and application thereof

A nitrogen-doped porous carbon and metal-loaded technology, which is applied in structural parts, secondary battery repair/maintenance, battery pack components, etc., can solve difficult electrochemical reaction processes and other problems, and achieve simple preparation process and capacity decay The effect of small rate and strong affinity

Pending Publication Date: 2021-01-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after lithium polysulfide is adsorbed, it is difficult to continue to fully participate in the subsequent electrochemical reaction process.

Method used

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  • Nitrogen-doped porous carbon loaded metal cobalt material as well as preparation method and application thereof
  • Nitrogen-doped porous carbon loaded metal cobalt material as well as preparation method and application thereof
  • Nitrogen-doped porous carbon loaded metal cobalt material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of nitrogen-doped porous carbon material: Take 100 mg of Ketjen Black (KJ-600) in a vial, absorb water vapor for 50 minutes in a water vapor atmosphere at 80 ° C, and then place KJ-600 in NH 3 The nitrogen-doped porous carbon material was obtained by reacting in a tube furnace with an air velocity of about 30 SCCM for 1 hour.

[0040] The obtained nitrogen-doped porous carbon material was immersed in a saturated cobalt acetylacetonate / ethyl acetate solution (1:10 by volume) for 8 h. The samples were then transferred to a glove box, filtered and dried, and placed in NH 3 Calcined at 800°C for 1 hour in a tube furnace with an air flow rate of about 50 SCCM to obtain a nitrogen-doped porous carbon-supported metal cobalt material, which is marked as Co-800@KJ.

[0041] figure 1 It is the XRD spectrum of Co-800@KJ obtained in this example. It is replaced by two distinct diffraction peaks at 2θ=44.2° and 51.6°, which are consistent with (111) and (200) crystal ...

Embodiment 2

[0043]Mix 700mg of the nitrogen-doped porous carbon-supported metal cobalt material Co-800@KJ obtained in Example 1 with 300mg of sulfur and impregnate at 155°C for 10 hours, and then press the impregnated mixed material, super P and polyvinylidene fluoride according to The mass ratio is 8:1:1 mixed as the positive electrode material, assembled with lithium metal and Celgard2400 separator to form a lithium-sulfur battery, and tested, the active mass loading of all tests is 1-5mg cm -2 . KJ-600 is assembled into a lithium-sulfur battery using the same method.

[0044] Figure 2a The charging and discharging diagram of the first cycle of the battery is the KJ-600 obtained in Example 2 used as the positive electrode carrier of the lithium-sulfur battery and Co-800@KJ used as the positive electrode carrier of the lithium-sulfur battery. Figure 2b The cyclic voltammetry curves of KJ-600 obtained in Example 2 as the positive electrode carrier for lithium-sulfur batteries and Co-8...

Embodiment 3

[0046] Grind the nitrogen-doped porous carbon-supported metal cobalt material Co-800@KJ and polyvinylidene fluoride (binder) in Example 1 in a mortar at a mass ratio of 6:4, and add an appropriate amount of nitrogen methyl The homogeneous slurry obtained after pyrrolidone (NMP) is coated on one side of the Celgard2400 diaphragm, dried, cut into 19mm discs, and used as the diaphragm of the battery, wherein the material faces the positive electrode, and the preparation of the positive electrode material is the simplest. The original method is to directly mix pure sulfur with a binder, coat it on aluminum foil, and dry the cut piece as a pole piece. KJ-600 uses the same method to coat the separator and assemble it into a lithium-sulfur battery.

[0047] image 3 , Figure 4 The AC impedance (Nyquist) curves of the lithium-sulfur battery with KJ-600 obtained in Example 3 as the diaphragm modification material and Co-800@KJ as the diaphragm modification material and the nitrogen-...

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Abstract

The invention discloses a nitrogen-doped porous carbon loaded metal cobalt material as well as a preparation method and application thereof, which belong to the field of lithium-sulfur batteries. Thepreparation method specifically comprises the following steps of putting porous carbon into a water vapor environment of flowing ammonia gas, pouring the porous carbon adsorbing ammonia water into anethyl acetate solution dissolved with cobalt acetylacetonate, standing, carrying out suction filtration, and drying, and finally, calcining the dried product to obtain the nitrogen-doped porous carbonloaded metal cobalt material. The nitrogen-doped porous carbon loaded metal cobalt can be used for doubly adsorbing polysulfide through chemical adsorption and physical adsorption, so that the dissolution of polysulfide in an electrolyte is reduced, shuttling of polysulfide is effectively inhibited, and the conductivity of an electrode material is enhanced through porous carbon. The doping of nitrogen can accelerate the reaction kinetics process, and the porous carbon has a large internal space, so that the volume expansion of the positive electrode can be effectively relieved, and the stability of the battery is improved. And meanwhile, the diaphragm coated with the material is not easily punctured by dendrites to cause short circuit of the battery, and the safety of the lithium-sulfur battery is also guaranteed.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a nitrogen-doped porous carbon-supported metal cobalt material and a preparation method and application thereof. Background technique [0002] In recent years, with the increasingly prominent environmental problems and people's strong demand for battery life, many experts have begun to explore high-energy-density battery systems. The energy storage system uses sulfur as the positive electrode of the battery and lithium as the negative electrode, and its theoretical energy density is as high as 2600Wh kg -1 , making lithium-sulfur batteries a research hotspot for energy storage devices. However, the practical application of lithium-sulfur batteries is still hampered by inherent problems such as the shuttling effect, low sulfur utilization, and severe volume changes during cycling. For example: the electron / ion conductivity of the sulfur positive elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/431H01M10/42H01M10/052
CPCH01M10/4235H01M10/052Y02E60/10
Inventor 李爱菊镇顺英彭林邢震宇
Owner SOUTH CHINA NORMAL UNIVERSITY
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