Lithium-sulfur battery positive electrode material, preparation method, positive plate and lithium-sulfur battery
A technology for lithium-sulfur batteries and positive electrode materials, which is applied to battery electrodes, lithium batteries, and non-aqueous electrolyte battery electrodes. , Accelerated redox reaction, strong chemical adsorption effect
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[0035] see figure 2 , a preferred embodiment of the present invention also provides a method for preparing the lithium-sulfur battery cathode material 100, comprising the following steps:
[0036] Step S11 , adding the conductive substrate 10 suspension and the surfactant into the solvent, and mixing to form a first dispersion.
[0037] Wherein, the concentration of the conductive substrate 10 in the suspension of the conductive substrate 10 is 0.05-10g L -1 , the concentration of the surfactant is 0.5-10mol L -1 .
[0038] The surfactant may be cetyltrimethylammonium bromide or the like.
[0039] The conductive substrate 10 suspension may be graphene oxide (GO) suspension, carbon nanotube suspension, porous carbon and carbon fiber suspension, etc.
[0040] The solvent can be oxalic acid and the like.
[0041] In this embodiment, the suspension of the conductive substrate 10 is a GO suspension, and correspondingly, the surfactant is a cationic surfactant, that is, hexade...
Embodiment 1
[0056] In the first step, 800 mg of reduced graphene oxide was added to 400 mL of deionized water to obtain a graphene oxide (GO) suspension with a concentration of 2 mg mL-1, which was sonicated for 1 h.
[0057] In the second step, 3.2 g of cetyltrimethylammonium bromide was added to the GO suspension in the first step, stirred thoroughly for 30 min, and ultrasonicated for 3 h.
[0058] In the third step, 80 mL of 1M oxalic acid solution was added to the suspension in the second step under vigorous stirring to obtain the first dispersion.
[0059] In the fourth step, 800 μL of tetrabutyl titanate was added to the first dispersion, mixed and heated at 50° C. for 20 h with stirring to obtain a second dispersion.
[0060] In the fifth step, 0.704 g (4 mmol) of nickel acetate was added to the second dispersion under stirring, and after stirring for 30 min, 0.912 g (10 mmol) of thiourea was added, and stirring was continued for 30 min.
[0061] In the sixth step, the mixture obt...
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