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
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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.
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Abstract
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