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ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material, preparation method thereof, positive electrode plate containing ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material and lithium-sulfur battery

A technology for lithium-sulfur batteries and positive electrode materials, applied in the direction of battery electrodes, lithium batteries, carbon preparation/purification, etc., can solve the problems of poor conductivity of elemental sulfur, achieve accelerated transformation reactions, suppress the shuttle effect, and reduce micropores The effect of proportion

Active Publication Date: 2020-01-31
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a lithium-sulfur battery anode material active material and a preparation method thereof. The anode active material is selected from the composite carbon material as 0-0-=--1234, and the elemental sulfur is infiltrated into the graded pore structure by a melting method. , used to overcome the poor conductivity of elemental sulfur, volume expansion and the shuttle effect of polysulfide ions, etc., to prepare high-performance lithium-sulfur batteries

Method used

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  • ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material, preparation method thereof, positive electrode plate containing ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material and lithium-sulfur battery
  • ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material, preparation method thereof, positive electrode plate containing ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material and lithium-sulfur battery
  • ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material, preparation method thereof, positive electrode plate containing ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0041] A preparation method of a lithium-sulfur battery cathode active material, comprising the following steps:

[0042] (1)CoS 2 - Preparation of NC composite carbon materials:

[0043] Take 0.5mol Co(NO 3 ) 2 ·6H 2 O and 2mol 2-methylimidazole were respectively dissolved in 100ml of methanol, magnetically stirred for 30min until completely dissolved, then the methanol solution containing 2-methylimidazole was quickly poured into Co(NO 3 ) 2 ·6H 2 O methanol solution, washed several times with absolute ethanol, centrifuged, and vacuum-dried at 60°C for 12h to obtain the ZIF67 precursor;

[0044] The above-mentioned ZIF67 precursor was subjected to high-temperature sintering treatment under the protection of argon, and the temperature was raised to 800°C at a rate of 5°C / min and kept for 3 hours. After cooling to room temperature with the furnace, the product was collected and named Co-NC;

[0045] Modification of Co-NC with phosphorus: Co-NC is sprayed with aqueous so...

Embodiment 2

[0055] A lithium-sulfur battery, the lithium-sulfur battery cathode active material adopts the lithium-sulfur battery cathode active material described in Example 1 (refer to Figure 3 to Figure 4 ).

[0056] This embodiment provides a method for preparing a lithium-sulfur battery, comprising the following steps:

[0057] (1) Preparation of the positive electrode sheet: take the lithium sulfur positive electrode active material, superconducting carbon, and binder LA133 described in Example 1 by mass ratio 80:10:10 and place them in an agate ball mill jar, by mass ratio 1: 30 LA133, deionized water Weigh deionized water into the ball mill tank, high-energy ball mill at 400rpm for 30min, and then evenly coat the obtained slurry on the aluminum foil, the surface density is controlled to an average of 1.55mg / cm 2 , put the pole pieces obtained above in a vacuum drying oven, dry them in vacuum at 55°C for 24 hours, and cut them into small discs with a diameter of 15mm using a cutt...

experiment example

[0065] The composite carbon material and the composite lithium-sulfur cathode active material described in Example 1 and Comparative Example 1 were characterized as follows:

[0066] (1) X-ray diffraction (XRD): Utilize the diffraction phenomenon of X-rays in the material to analyze the crystalline state, crystal structure, crystal size, crystal composition, etc. of the material; the present invention is accordingly described in embodiment 2 and comparative example 2 Qualitative analysis of cathode active materials for lithium-sulfur batteries.

[0067] Test instrument: RIGAKU TTR-3 X-ray diffractometer.

[0068] Test conditions: radiation source is Cu target (λ=1.54056 ).

[0069] Scanning range: 2θ=10-80°.

[0070] Scanning speed: 6° / min.

[0071] (2) X-ray Photoelectron Spectroscopy (XPS): Based on this, the present invention conducts qualitative analysis on the surface composition and element valence state of the composite carbon material described in Example 1.

[0...

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Abstract

The invention discloses a ZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material, a preparation method thereof, a positive electrode plate containing theZIF67-derived composite carbon material-containing lithium-sulfur battery positive electrode material and a lithium-sulfur battery. The preparation method comprises the following steps: using ZIF67 as a precursor, carrying out high-temperature sintering carbonization to obtain a nitrogen-doped hierarchical pore carbon material embedded with metal Co particles, and vulcanizing Co in the compositeporous carbon material into CoS2 by adopting a high-temperature vulcanization method. The preparation method of a positive electrode active material of the lithium-sulfur battery comprises the following steps: weighing the composite carbon material and elemental sulfur according to a mass ratio of 1: 4, infiltrating the elemental sulfur into the porous carbon material by adopting a melting method,and preparing a positive electrode plate from the lithium-sulfur battery positive electrode active material, superconducting carbon and a binder LA133 according to a mass ratio of 80: 10: 10. The lithium-sulfur battery is mainly formed by assembling the positive electrode plate, a diaphragm, an electrolyte and a metal lithium negative pole piece, and the obtained lithium-sulfur battery has excellent cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon materials and lithium-sulfur batteries, and relates to a polar nano-inorganic substance / porous carbon composite material, a lithium-sulfur battery positive electrode material and a preparation method thereof, and a positive electrode made of the lithium-sulfur battery positive electrode active material pole pieces and lithium-sulfur batteries. Specifically, it relates to a positive electrode material for a lithium-sulfur battery containing a ZIF67-derived composite carbon material, a preparation method thereof, a positive electrode sheet containing the same, and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries have attracted extensive attention due to their high specific energy, low cost, and environmental friendliness. However, in the practical application of lithium-sulfur batteries, there are still some scientific and technical problems to be solve...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01B32/05H01M4/13H01M4/36H01M4/38H01M4/62H01M10/052
CPCC01G51/30C01B32/05H01M4/362H01M4/38H01M4/628H01M4/625H01M4/13H01M10/052C01P2004/80C01P2002/85C01P2002/72C01P2004/04C01P2004/62C01P2006/16C01P2006/14C01P2006/12Y02E60/10
Inventor 郑春满罗世强刘双科洪晓斌王丹琴李宇杰陈宇方王珲
Owner NAT UNIV OF DEFENSE TECH
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