Molybdenum/cobalt oxide-carbon composite material and preparation method thereof, lithium ion battery negative pole piece and lithium ion battery
A technology of carbon composite materials and lithium-ion batteries, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve problems such as short cycle life, low specific capacity of negative electrode materials, and poor rate performance, achieving low cost and excellent performance , the effect of improving the electrical conductivity
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[0028] The present invention proposes a method for preparing a molybdenum / cobalt oxide-carbon composite material, the preparation method comprising:
[0029] S1: Weigh molybdenum salt, cobalt salt and citric acid, and prepare molybdenum salt, cobalt salt and citric acid into aqueous solutions;
[0030] Two transition metal salts, molybdenum salt and cobalt salt, are selected as raw materials because the final molybdenum oxide and cobalt oxide have high specific capacity, and citric acid can complex the molybdenum salt and cobalt salt as a complexing agent. combined to form a gel.
[0031] Preferably, the aqueous solution is prepared with deionized water to avoid introducing other impurity elements.
[0032] Preferably, the molybdenum salt is MoCl 5 、Mo(CO) 6 , (NH 4 ) 6 Mo 7 o 24 4H 2 O, K 2 MoO 4 、Na 2 MoO 4 2H 2 O and (NH 4 ) 2 MoO 4 2H 2 One or more of O; the cobalt salt is CoSO 4 ·7H 2 O. CoC 2 o 4 2H 2 O. Co 3 (PO 4 ) 2 , Co(NO 3 ) 2 ·6H 2 O, C...
Embodiment 1
[0049] This embodiment provides a method for preparing a molybdenum / cobalt oxide-carbon composite material, including:
[0050] S1: Weigh 1.5-8.4g molybdenum salt (preferably 4.64g (NH 4 ) 6 Mo 7 o 24 4H 2 O), 1.0~6.5g cobalt salt (preferably 1.70g CoCl 2 ) and 2.5-7.6g citric acid (preferably 4.15g citric acid), and molybdenum salt, cobalt salt and citric acid were dissolved in 5-30ml (preferably 12ml), 4-20ml (preferably 8ml) and 3-15ml (preferably 10ml) deionized water to make an aqueous solution, the concentrations are respectively 0.1-2.0mol / L (preferably 0.31mol / L), 0.2-4.0mol / L (preferably 1.64mol / L), 0.5-5.0mol / L (preferably 1.97mol / L) / L);
[0051] S2: Under stirring conditions, sequentially add the cobalt salt aqueous solution and the citric acid aqueous solution to the molybdenum salt aqueous solution successively, and continue stirring for 5-50 minutes (preferably 30 minutes) to form a mixed solution, and use ammonia water to adjust the pH value of the mixed...
Embodiment 2
[0061] This embodiment provides a lithium-ion battery negative pole piece and a lithium-ion battery. The negative electrode material of the lithium-ion battery negative pole piece is the molybdenum / cobalt oxide-carbon composite material MoO described in Example 1. x -CoO y / C, the negative pole piece of the lithium ion battery is the negative pole piece of the lithium ion battery.
[0062] The specific preparation method is as follows:
[0063] (1) Negative electrode sheet preparation. Weigh the molybdenum-cobalt negative electrode material MoO according to the mass ratio of 80:10:10 x -CoO y / C, superconducting carbon and binder PVDF are placed in a high-energy ball mill tank, and the ratio of PVDF / deionized water is 1:40 according to the mass ratio. min speed ball milling for 30min to obtain a uniformly mixed slurry. Finally, the obtained slurry is evenly coated on the copper foil, and the surface density is controlled to an average of 1.2mg / cm 2 , put the obtained pol...
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