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Method for preparing negative electrode material by biotite modified by lithium ion exchange method

A negative electrode material, biotite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as poor electrical properties of biotite, achieve abundant reserves, fast speed, and improved specific capacitance.

Active Publication Date: 2019-12-31
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Biotite has a typical layered structure, which is very similar to that of graphene negative electrode materials, and has potential as an electrode material. However, biotite itself has poor electrical properties and cannot be directly used as an electrode material. Therefore, it is necessary to find a Simple and effective method to modify biotite for use in battery electrodes

Method used

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  • Method for preparing negative electrode material by biotite modified by lithium ion exchange method
  • Method for preparing negative electrode material by biotite modified by lithium ion exchange method
  • Method for preparing negative electrode material by biotite modified by lithium ion exchange method

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Embodiment 1

[0034] A method for preparing negative electrode materials by modifying biotite by lithium ion exchange method is provided, which specifically includes the following steps:

[0035] 1) After the biotite ore is pulverized with a ball mill, pass through a 200-mesh sieve;

[0036] 2) The biotite ore powder obtained in step 1) is uniformly mixed with the lithium nitrate aqueous solution of 0.77mol / L, wherein the mass volume ratio of the biotite ore powder and the lithium nitrate aqueous solution is 1g:250ml, and the molar concentration is 0.5mol / L dilute hydrochloric acid solution to adjust the pH value of the mixed solution to 1.5, then place the mixed solution in a constant temperature water bath at 80°C for stirring, filter the mixed solution after reacting for 5 hours, collect the solid insolubles and dry them to obtain the hydrated lepidolite negative electrode material.

[0037] figure 1 and image 3 are the XRD patterns of biotite raw ore and the hydrated lepidolite negat...

Embodiment 2

[0041] A method for preparing negative electrode materials by modifying biotite by lithium ion exchange method is provided, which specifically includes the following steps:

[0042] 1) After the biotite ore is pulverized with a ball mill, pass through a 200-mesh sieve;

[0043] 2) The biotite ore powder obtained in step 1) is uniformly mixed with the lithium nitrate aqueous solution of 0.77mol / L, wherein the mass volume ratio of the biotite ore powder and the lithium nitrate aqueous solution is 1g:250ml, and the molar concentration is 0.5mol / L dilute hydrochloric acid solution to adjust the pH value of the mixed solution to 1.5, then place the mixed solution in a constant temperature water bath at 80°C for stirring, filter the mixed solution after reacting for 10 hours, collect the solid insolubles and dry them to obtain the hydrated lepidolite negative electrode material.

[0044] Figure 5 The X-ray diffraction pattern (XRD) of the hydrated lepidolite negative electrode mat...

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Abstract

The invention relates to a method for preparing a negative electrode material by biotite modified by a lithium ion exchange method. The negative electrode material is hydrated lithia mica which is prepared by replacing potassium ions in biotite with lithium ions. The method uses the lithium ion exchange method to extract potassium ions, the extraction cost is relatively low, a speed is fast, the environment is friendly, and a typical layered structure of biotite is retained. The specific capacitance of the obtained negative electrode material has a significant improvement, and the price of biotite is cheap, so that the preparation cost of the electrode material is reduced, more choices for development of electrode materials are provided, and the application prospect is broad.

Description

technical field [0001] The invention relates to the technical fields of chemistry, new energy development and the like, in particular to a method for preparing negative electrode materials by modifying biotite by lithium ion exchange. [0002] technical background [0003] Biotite is a mica group mineral with a typical layered silicate structure. In the mica group crystal structure, [SiO 4 ] tetrahedral layer with [AlO 6 ] octahedral layers in a ratio of 1:2, [SiO in the mica structural unit layer 4 ] In the tetrahedral sheet, there is an obvious phenomenon of replacing Si with Al, which is called "isotropic replacement" in mineralogy, which leads to a large number of negative charges in the structural unit layer, and the same amount of positively charged cations needs to be adsorbed between the layers. , to realize the overall electrical neutrality of the mica. Biotite ore is rich in reserves, low in price, has excellent physical and chemical properties, and has extensive...

Claims

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Application Information

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IPC IPC(8): C01B33/42
CPCC01B33/42C01P2002/72C01P2006/40
Inventor 黄志良程怡林姚东辉吴昌胜陈松
Owner WUHAN INSTITUTE OF TECHNOLOGY
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