Negative electrode material for lithium ion secondary battery and preparation method thereof
A secondary battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle stability, achieve uniform particle size, simple and easy-to-control process conditions, and improve cycle performance.
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Embodiment 1
[0026] A preparation method of the lithium ion secondary battery negative electrode material, the steps are as follows:
[0027] 1) The precursor was prepared by the sol-gel method: first, the elemental Si and lithium acetate were dissolved in ethanol to form a saturated solution; The rate of 1 drop was added dropwise to the lithium acetate ethanol solution; again, the Si ethanol solution was added to the lithium acetate ethanol solution containing tetrabutyl titanate at the ratio of Si and Ti atomic ratio of 1:1; finally, the weight Glucose aqueous solution with a specific concentration of 60% is added dropwise to the above mixed solution at a rate of 1 drop per second at a volume ratio of 10:1 to the mixed solution, and after being hydrolyzed for 10 hours, dried at 80°C for 15 hours to obtain Xerogel precursor.
[0028] 2) Calcination by high-temperature solid-state method: the precursor obtained above is calcined at 800° C. for 10 h in an argon atmosphere at normal pressur...
Embodiment 2
[0033] A preparation method of the lithium ion secondary battery negative electrode material, the steps are as follows:
[0034] 1) The precursor was prepared by the sol-gel method: first, the elemental Si and lithium acetate were dissolved in ethanol to form a saturated solution; The rate of 1 drop was added dropwise to the lithium acetate ethanol solution; again, the Si ethanol solution was added to the lithium acetate ethanol solution containing tetrabutyl titanate at the ratio of Si and Ti atomic ratio of 4:1; finally, the weight Glucose aqueous solution with a specific concentration of 40% is added dropwise to the above mixed solution at a rate of 1 drop per second at a ratio of 8:1 to the volume ratio of the mixed solution. After being hydrolyzed for 6 hours, it is dried at 80°C for 10 hours to obtain Xerogel precursor.
[0035] 2) Calcination by high-temperature solid-state method: the precursor obtained above is calcined at 650° C. for 20 h in an argon atmosphere at n...
Embodiment 3
[0040] A preparation method of the lithium ion secondary battery negative electrode material, the steps are as follows:
[0041] 1) The precursor was prepared by the sol-gel method: first, the elemental Si and lithium acetate were dissolved in ethanol to form a saturated solution; The rate of 1 drop was added dropwise to the lithium acetate ethanol solution; again, the Si ethanol solution was added to the lithium acetate ethanol solution containing tetrabutyl titanate at the ratio of Si to Ti atomic ratio of 8:1; finally, the weight Glucose aqueous solution with a specific concentration of 20% is added dropwise to the above mixed solution at a rate of 1 drop per second at a ratio of 1:1 to the volume ratio of the mixed solution. After being hydrolyzed for 3 hours, it is dried at 80°C for 5 hours to obtain Xerogel precursor.
[0042] 2) Calcination by high-temperature solid-state method: the precursor obtained above is calcined at 700° C. for 15 hours in an argon atmosphere at...
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