Positive electrode material, positive plate, preparation method of positive plate, and lithium-sulfur battery
A positive electrode material and positive electrode sheet technology, which is applied in the field of lithium-sulfur batteries, can solve problems such as complex synthesis processes, achieve simple preparation processes, and improve reaction kinetics and electrochemical performance.
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[0046] The invention also provides a method for preparing the oxide / sulfide heterostructure, which includes the following steps:
[0047] Step S1: Weigh a certain mass ratio of oxide and sulfur source and put them into a heat treatment container respectively, and evacuate the heat treatment container and fill it with a protective atmosphere.
[0048] Step S2, heat treating the oxide and sulfur source in a vacuum environment and a protective atmosphere. Wherein, in the heat treatment process, the sulfur source volatilizes to form sulfur vapor, and the sulfur vapor undergoes an in-situ sulfidation reaction on the surface part of the oxide to sulfide the surface part of the oxide into a corresponding sulfide, thereby The oxide / sulfide heterostructure is produced.
[0049] Wherein, the reaction principle of the in-situ vulcanization reaction is: using a sulfur source to sublime at a certain temperature to generate sulfur vapor, the sulfur vapor and oxides react to generate corresponding...
Embodiment 1
[0091] This example uses WO 3 / WS 2 Take the preparation of heterostructures as an example.
[0092] (1) Weigh 4g of thiourea powder into one corundum ark, and weigh 1g of tungsten oxide powder into another corundum ark.
[0093] (2) Put the thiourea ark and tungsten oxide ark into the central temperature zone of the quartz tube in sequence.
[0094] (3) Use a vacuum pump to evacuate, and then evacuate after being filled with argon gas, and evacuate the quartz tube to a vacuum state after repeated three times.
[0095] (4) Heat the tube furnace to 350°C at a heating rate of 2°C / min for 1.5 hours. Afterwards, the temperature was raised to 400°C at a temperature increase rate of 10°C / min and kept for 1.5 hours. Finally, the tube furnace was purged with argon for 30 minutes. The powder obtained is 3WO 3 -1WS 2 Heterogeneous structure. Scanned image like figure 1 In Figure b, the phase analysis is figure 2 3WO in 3 -1WS 2 .
[0096] (5) The graphene and sulfur powder are mechanically m...
Embodiment 2
[0101] This example uses WO 3 / WS 2 Take the preparation of heterostructures as an example.
[0102] (1) Weigh 4g of thiourea powder into one corundum ark, and weigh 1g of tungsten oxide powder into another corundum ark.
[0103] (2) Put the thiourea ark and tungsten oxide ark into the central temperature zone of the quartz tube in sequence.
[0104] (3) Use a vacuum pump to evacuate, and then evacuate after being filled with argon gas, and evacuate the quartz tube to a vacuum state after repeated three times.
[0105] (4) Heat the tube furnace to 350°C at a heating rate of 2°C / min for 1.5 hours. Afterwards, the temperature was increased to 500°C at a temperature increase rate of 10°C / min and kept for 1.5 hours. Finally, the tube furnace was purged with argon for 30 minutes. The obtained powder is 1WO 3 -2WS 2 Heterogeneous structure. Scanned image like figure 1 As shown in figure c, the phase analysis is as figure 2 1WO in 3 -2WS 2 .
[0106] (5) The graphene and sulfur powder are...
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