Lithium-sulfur battery positive electrode material containing zif67-derived composite carbon material and preparation method, positive electrode sheet containing it, and lithium-sulfur battery

A technology for lithium-sulfur batteries and cathode materials, which is applied in lithium batteries, battery electrodes, and carbon preparation/purification, etc., can solve problems such as poor conductivity of elemental sulfur, and achieve the effects of accelerating the transformation reaction, increasing the ratio, and buffering volume expansion.

Active Publication Date: 2022-03-04
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a lithium-sulfur battery cathode material active material and a preparation method thereof. The cathode active material selects the above-mentioned composite carbon material as a sulfur-carrying matrix, and melts elemental sulfur into the hierarchical pore structure through a melting method to overcome elemental sulfur. Solve the poor conductivity of sulfur, volume expansion and the shuttle effect of polysulfide ions, and prepare high-performance lithium-sulfur batteries

Method used

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  • Lithium-sulfur battery positive electrode material containing zif67-derived composite carbon material and preparation method, positive electrode sheet containing it, and lithium-sulfur battery
  • Lithium-sulfur battery positive electrode material containing zif67-derived composite carbon material and preparation method, positive electrode sheet containing it, and lithium-sulfur battery
  • Lithium-sulfur battery positive electrode material containing zif67-derived composite carbon material and preparation method, positive electrode sheet containing it, and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

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

[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.

[0072] Test inst...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode material containing a ZIF67-derived composite carbon material, a preparation method, a positive electrode sheet containing the same, and a lithium-sulfur battery. The preparation method includes: using ZIF67 as a precursor, sintering and carbonizing at high temperature into a nitrogen-doped hierarchical porous carbon material with metal Co particles embedded, and using a high-temperature vulcanization method to vulcanize Co in the composite porous carbon material to CoS 2 . The preparation method of the positive electrode active material of the lithium-sulfur battery comprises: weighing the above-mentioned composite carbon material and elemental sulfur according to a mass ratio of 1:4, and melting the elemental sulfur into the porous carbon material by a melting method, and the mass ratio of the positive pole piece is 80: It is made of 10:10 lithium-sulfur battery positive electrode active material, superconducting carbon, and binder LA133. The lithium-sulfur battery is mainly assembled from the above-mentioned positive pole piece, separator, electrolyte, and metal lithium negative pole piece. The obtained lithium-sulfur battery has excellent cycle performance and rate performance.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38C01G51/00C01B32/05H01M4/13H01M4/36H01M4/62H01M10/052
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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