A kind of negative electrode composite material sn/mxene@c and its preparation method
A composite material and negative electrode technology, which is applied in the field of negative electrode composite material Sn/MXene@C and its preparation, can solve the problems of not being able to effectively alleviate the volume effect, not having a stable frame structure, and not being able to form an SEI film, etc., to achieve good cycle stability High performance, wide applicability and low cost
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Embodiment 1
[0036] This embodiment includes the following steps:
[0037] (1) Add 1000 mg Ti 3 AlC 2 The powder was added to 30 g of hydrofluoric acid aqueous solution with a mass concentration of 40 wt%, and sealed with a plastic wrap, and stirred at a constant temperature of 95 °C for 7 h at a stirring speed of 600 rpm to etch away the Al layer, and the reacted The solution was centrifuged, then centrifuged and washed with deionized water for 6 times, until the pH of the lotion was neutral, the centrifugation speed was 10,000 rpm, and the centrifugation time was 10 min each time, and the cleaned precipitate was ultrasonicated with deionized water as solvent Disperse, the ultrasonic power is 400 W, the time is 2 h, the ultrasonic solution is centrifuged and washed twice with absolute ethanol, put in a 60 °C oven, and dried for 8 h to obtain MXene powder;
[0038](2) Weigh 100 mg of the MXene powder obtained in step (1), add it into 40 ml of absolute ethanol, and disperse it ultrasonica...
Embodiment 2
[0047] This embodiment includes the following steps:
[0048] (1) Add 1250 mg Ti 3 AlC 2 The powder was added to 40 g of hydrofluoric acid aqueous solution with a mass concentration of 35 wt%, and sealed with a plastic wrap, stirred at a constant temperature of 94 °C for 8 h, and kept at a stirring speed of 450 rpm, the Al layer was etched away, and the reaction solution was centrifuged. Centrifuge and wash with deionized water for 7 times until the pH of the lotion is neutral, the centrifugal speed is 9800 rpm, and the centrifugation time is 12 minutes each time. The precipitate after cleaning is ultrasonically dispersed with deionized water as a solvent. The ultrasonic power is 500 W, time 1.5 h, the ultrasonic solution was centrifuged and washed twice with absolute ethanol, placed in a 70 °C oven, and dried for 12 h to obtain Ti 2 C 3 powder;
[0049] (2) Weigh 160 mg of Ti obtained in step (1) 2 C 3 The powder was ultrasonically dispersed in 40ml deionized water for ...
Embodiment 3
[0057] This embodiment includes the following steps:
[0058] (1) Add 1100 mg Ti 3 AlC 2 The powder was added to 35 g of hydrofluoric acid aqueous solution with a mass concentration of 38 wt%, and sealed with a plastic wrap, at a constant temperature of 93°C, stirred for 7.5 h, and kept at a stirring speed of 650 rpm, etched away the Al layer, and centrifuged the reaction solution. Centrifuge and wash with deionized water for 7 times until the pH of the lotion is neutral, the centrifugal speed is 9500 rpm, and the centrifugation time is 11 minutes each time. The precipitate after cleaning is ultrasonically dispersed with deionized water as a solvent. The ultrasonic power is 300 W, time 3 h, the ultrasonic solution was centrifuged and washed twice with absolute ethanol, placed in an oven at 75 °C, and dried for 15 h to obtain Ti 2 C 3 powder;
[0059] (2) Weigh 80 mg of Ti obtained in step (1) 2 C 3 The powder was ultrasonically dispersed in 40 ml deionized water for 20 m...
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