X-H-Si-O 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 the fields of electrochemical batteries, new layered X-H-Si-O system materials, negative electrode active materials and their preparation, and electrochemical battery negative electrode materials, can solve the problem of reducing the cost of battery manufacturing , complex magnesia thermal reduction reaction, etc., to achieve the effect of reducing manufacturing costs
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[0061] The embodiment of the present invention also provides a preparation method of negative electrode active material, comprising:
[0062] S1, providing purified phyllosilicate;
[0063] S2, mixing the phyllosilicate with an acid solution to at least partially remove metal elements in the phyllosilicate; and
[0064] S3, mixing the solid product obtained in the step S2 with the X source solution, the pH of the X source solution is 8 to 14, so that the hydrogen part in the solid product is replaced by X to obtain the negative electrode active material.
[0065]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 sele...
Embodiment 1
[0093] S1, the natural palygorskite mineral is purified by natural drying-crushing-airflow drying-grinding-wind classification to obtain high-grade palygorskite mineral powder.
[0094] S2, stir the palygorskite powder in an aqueous hydrochloric acid solution with a concentration of 1.5mol / L, the stirring time is 2 hours, and the temperature is 70°C, filter the reacted powder, and rinse it with deionized water 2 to 3 times , dried under vacuum at room temperature.
[0095] S3, stir the dried powder in an aqueous solution of lithium hydroxide with a concentration of 2 mol / L, the stirring time is 2 hours, the temperature is 35°C, the solid phase is filtered, rinsed with deionized water for 2 to 3 times, and vacuum-dried at room temperature , The obtained powder is recorded as Li-H-Si-O-1 precursor.
[0096] S4, heat-treat the dried solid-phase product under vacuum at 300°C for 4 hours (the heating rate is 5°C / min), and obtain a negative electrode active material powder with a l...
Embodiment 2
[0102] S1, the natural montmorillonite mineral is purified by natural drying-crushing-airflow drying-grinding-wind classification to obtain high-grade montmorillonite mineral powder.
[0103] S2, stirring the montmorillonite powder in an aqueous hydrochloric acid solution with a concentration of 4 mol / L for 10 hours at a temperature of 25°C, filtering the reacted powder, and rinsing it with deionized water 2 to 3 times, Vacuum dry at room temperature.
[0104] S3. Stir the dried powder in an aqueous lithium hydroxide solution with a concentration of 0.5mol / L, then transfer it to a reaction kettle with a polytetrafluoroethylene liner, and place it in a blast drying oven at 180°C. The reaction time is For 12 hours, the solid phase was filtered, rinsed with deionized water 2 to 3 times, and dried under vacuum at room temperature.
[0105] S4, heat-treating the dried solid-phase product at 450° C. for 5 hours under vacuum (the heating rate is 5° C. / min) to obtain a negative elect...
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