H-Si-O system material, negative electrode active material and preparation method thereof, electrochemical battery negative electrode material and electrochemical battery
A negative electrode active material and electrochemical technology, applied in battery electrodes, electrochemical generators, inorganic chemistry, etc., can solve the problems of complex magnesia thermal reduction reaction and difficulty in reducing battery manufacturing costs
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[0057] The embodiment of the present invention also provides a preparation method of negative electrode active material, comprising:
[0058] S1, providing purified phyllosilicate;
[0059] S2, mixing the layered silicate with an acid solution to at least partially remove metal elements in the layered silicate to obtain the layered negative electrode active material.
[0060] The type of layered silicate is not limited, as long as it has layered doped or undoped layered silicon-oxygen tetrahedral layers, for example, it can be 1:1 type layered silicate, 2:1 type At least one of layered silicates and other types of layered silicates. The 1:1 type phyllosilicate may be selected from at least one of serpentine, kaolinite and halloysite, for example. The 2:1 type layered silicate can be selected from at least one of talc, pyrophyllite, muscovite, glauconite, phlogopite, biotite, lepidolite, vermiculite, montmorillonite and palygorskite, for example. kind. The silicates of othe...
Embodiment 1
[0087] S1, the natural montmorillonite mineral is purified by natural drying-crushing-airflow drying-grinding-wind classification to obtain high-grade montmorillonite mineral powder.
[0088] S2, put the montmorillonite powder at a concentration of 0.50mol L -1 Stir in a hydrochloric acid aqueous solution, the stirring time is 2 hours, the temperature is 70°C, the reacted solid is filtered, rinsed with deionized water for 2 to 3 times, and vacuum-dried at room temperature.
[0089] S3, heat-treat the dried solid powder under vacuum at 200°C for 2 hours (the heating rate is 5°C·min -1 ), that is, the negative electrode active material powder with a layered silicate structure is obtained.
[0090] see Figure 4 , the obtained negative electrode active material powder is subjected to XRD test, and the negative electrode active material has a layered crystal structure judged from the peak at about 10°. According to the elemental analysis, the molar ratio of metal elements excep...
Embodiment 2
[0095] S1, natural illite minerals are purified by natural drying-crushing-airflow drying-grinding-wind classification to obtain high-grade illite mineral powders.
[0096] S2, the illite powder at a concentration of 3.00mol L -1 Stir in an aqueous solution of hydrochloric acid for 10 hours at a temperature of 25°C. After filtering the reacted solid, wash it with deionized water for 2 to 3 times, and dry it under vacuum at room temperature.
[0097] S3, heat-treat the dried solid powder under vacuum at 600°C for 10 hours (the heating rate is 10°C·min -1 ), that is, the negative electrode active material powder with a layered silicate structure is obtained.
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