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

Active Publication Date: 2021-03-16
云南中晟新材料有限责任公司
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Problems solved by technology

[0005] In order to further improve the power performance of negative electrode materials, scholars also use sol-gel method or solid phase coating method to coat inorganic substances on the surface of negative electrode materials, but the existing coating methods are cumbersome to operate, the process is complicated, and it is difficult to Form a dense cladding layer, so that its power performance still cannot meet the requirements

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  • A kind of preparation method of lithium ion battery negative electrode material
  • A kind of preparation method of lithium ion battery negative electrode material

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preparation example Construction

[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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Abstract

The invention discloses a preparation method of a high-power lithium ion battery negative electrode material. The preparation method comprises the following steps: firstly, preparing Zn / Co-ZIF; mixinga ferrite solution, a cobalt salt solution and a nickel salt solution with a Zn / Co-ZIF solution in a protective gas, adding a 2-methylimidazole solution, uniformly stirring, standing, carrying out suction filtration, washing, and drying to obtain Zn / Co-ZIF coated Fe / Co / Ni-ZIF with the core-shell structure; and finally, sequentially calcining Zn / Co-ZIF@Fe / Co / Ni-ZIF in protective gas and air to obtain the high-power lithium ion battery negative electrode material. Zn / Co-ZIF@Fe / Co / Ni-ZIF with a core-shell structure is used as a precursor to perform two-step calcination in protective gas and airto obtain the high-power lithium battery negative electrode material, and the preparation method is simple in preparation process, mild in condition and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium battery negative electrode materials, and in particular relates to a preparation method of lithium ion battery negative electrode materials. Background technique [0002] With the rapid development and progress of modern science and technology and people's requirements for the use of portable electronic devices, the power supply of portable electronic devices is developing towards the trend of high efficiency, small size, light weight, thin shape and flexible diversification. Among them, lithium batteries have been widely concerned due to their advantages of high voltage, high capacity, low consumption, no memory effect, no pollution, small size, low internal resistance, low self-discharge, and many cycles. [0003] The negative electrode material is one of the key materials that determine the performance of lithium batteries. However, due to the limitation of graphite regular layer spacing (d=0.3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/523H01M4/62H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 韩俊女赵英杰
Owner 云南中晟新材料有限责任公司
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