A kind of preparation method of negative electrode composite material of lithium ion battery
A technology for lithium ion batteries and composite materials, which is applied in the field of preparation of negative electrode materials for lithium ion batteries, can solve the problems of loss of re-stacking active area, rapid decay of cycle performance, and no good solution, so as to improve cycle stability performance, The effect of stable cycle performance and high specific capacity
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Embodiment 1
[0044] This embodiment includes the following steps:
[0045] (1) Take 30.0 g hydrofluoric acid aqueous solution (mass fraction 40%), put it into a polytetrafluoroethylene tank, and add 1.0 g Ti 3 AlC 2 , heated and stirred at 600 rpm, constant temperature 90°C for 7 h, etched, removed Al layer, and mixed solution I was obtained;
[0046] (2) Centrifuge the mixed solution I obtained in step (1) at 10,000 rpm, wash with deionized water until the pH of the washing solution reaches neutral, and then sonicate at 350 W for 2 h; at 5,000 rpm Centrifuge again, wash with deionized water and absolute ethanol four times, and dry in vacuum at 80 °C for 24 h to obtain MXene powder-Ti 3 C 2 T x Material;
[0047] (3) Take the Ti obtained in step (2) 3 C 2 T x Add 0.05 g of the material to 40 ml of deionized water, ultrasonicate at 200 W for 10 min to obtain a uniform aqueous suspension, add 2 ml of ammonia water with a concentration of 13.38 mol / L, stir at 600 rpm for 1 h, and then...
Embodiment 2
[0060] This embodiment includes the following steps:
[0061] (1) Take 30.0 g hydrofluoric acid aqueous solution (mass fraction 40%) and add it to a polytetrafluoroethylene tank, and then add 1.0 g Ti 3 AlC 2 , at 1000 rpm, and then at a constant temperature of 120 °C, stirring for 12 h; performing etching to remove the Al layer to obtain a mixed solution I;
[0062] (2) Centrifuge the mixed solution I obtained in step (1) at 10,000 rpm, wash with deionized water until the pH value of the solution is neutral, then sonicate at 400 W for 4 h, at 10,000 rpm, The precipitate was cross-washed with deionized water and absolute ethanol four times, and dried in vacuum at 90 °C for 12 h to obtain Ti 3 C 2 T x material (an MXene material);
[0063] (3) Ti obtained in step (2) 3 C 2 T x Mix 0.25 g of the material with 40 ml of deionized water, sonicate at 400 W for 60 min to obtain a homogeneous aqueous suspension, then add 2.5 ml of 13.38 mol / L ammonia water, stir at 1000 rpm fo...
Embodiment 3
[0072] This embodiment includes the following steps:
[0073] (1) Take 30.0 g hydrofluoric acid aqueous solution (mass fraction 40%) and add it to a polytetrafluoroethylene tank, and then add 1.0 g Ti 3 AlC 2 , at a constant temperature of 50°C at 400 rpm, stirred for 5 h, etched to remove the Al layer, and mixed solution I was obtained;
[0074] (2) Centrifuge the mixed solution I obtained in step (1) at 3000 rpm, wash with deionized water until the pH of the solution is neutral, then sonicate at 200 W for 0.5 h, and at 3000 rpm, dissolve The precipitate was cross-washed four times with deionized water and absolute ethanol, and dried in vacuum at 45 °C for 48 h to obtain Ti 3 C 2 T x material (an MXene material);
[0075] (3) Ti obtained in step (2) 3 C 2 T x Mix 0.025 g of the material with 40 ml of deionized water, sonicate at 200 W for 5 min to obtain a homogeneous aqueous suspension, then add 1 ml of 13.38 mol / L ammonia water, stir at 400 rpm for 1 h, and then tak...
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