A kind of preparation method of lithium ion battery negative electrode material
A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, nanotechnology for materials and surface science, etc., can solve the problem of difficulty in forming a dense coating layer, unsatisfactory power performance, cumbersome operation, etc. problems, to achieve the effect of regulating the kernel size, mild conditions, and simple process
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[0031] The present invention provides a kind of preparation method of lithium ion battery negative electrode material, comprises the following steps:
[0032] S1. Preparation of zinc / cobalt bimetallic zeolite imidazolate framework material Zn / Co-ZIF;
[0033] Wherein, the substance ratio of Co and Zn is (0.1~1):1;
[0034] S2. In a protective gas atmosphere, uniformly disperse ferrous salt, cobalt salt, nickel salt, 2-methylimidazole and the Zn / Co-ZIF prepared in S1 in the first organic solvent respectively to obtain the corresponding organic solution;
[0035] S3. In a protective gas atmosphere, mix the ferrous salt organic solution, cobalt salt organic solution and nickel salt organic solution with the Zn / Co-ZIF organic solution, and then add the 2-methylimidazole organic solution, After stirring evenly, let stand, filter, wash and dry to obtain Zn / Co-ZIF@Fe / Co / Ni-ZIF with core-shell structure;
[0036] Wherein, the molar ratio of the ferrous salt, the cobalt salt and the...
Embodiment 1
[0043] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:
[0044] S1, preparation of zinc / cobalt bimetallic zeolite imidazolate framework material Zn / Co-ZIF; wherein the molar ratio of Co to Zn is 0.5:1;
[0045] The specific process is:
[0046] 148.74mg of zinc nitrate is dissolved in methanol to obtain the methanol solution of zinc nitrate with a concentration of 0.025mol / L, and 32.46mg of cobalt chloride is dissolved in methanol to obtain a concentration of 0.025mol / L. Solution, dissolve 4.8mol of 2-methylimidazole in methanol to obtain a methanol solution of 2-methylimidazole with a substance concentration of 1.5mol / L, then mix the three, stir evenly, and then let stand for 15h to obtain blue The turbid liquid was filtered by suction and dried at 80°C to obtain a blue powder, namely Zn / Co-ZIF;
[0047] Wherein, the ratio of the sum of the amount of substances of the zinc salt and the cobalt ...
Embodiment 2
[0055] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:
[0056] S1, preparation of zinc / cobalt bimetallic zeolite imidazolate framework material Zn / Co-ZIF; wherein, the molar ratio of Co to Zn is 0.1:1;
[0057] The specific process is:
[0058] 340.75mg of zinc chloride is dissolved in ethanol to obtain the ethanol solution of zinc chloride whose concentration of substance is 0.5mol / L, and 72.75mg of cobalt nitrate is dissolved in ethanol to obtain the concentration of substance in ethanol of cobalt nitrate Solution, dissolve 44mol of 2-methylimidazole in ethanol to obtain an ethanol solution of 2-methylimidazole with a substance concentration of 2.8mol / L, then mix the three, stir evenly, and then let it stand for 20h to obtain azure blue The turbid liquid was suction filtered and dried at 60°C to obtain a blue powder, namely Zn / Co-ZIF;
[0059] Wherein, the ratio of the sum of the amount of s...
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