Porous carbon material for negative electrode of power lithium ion battery and preparation method thereof
A technology of lithium ion battery and negative electrode material, applied in the field of electrochemical energy storage and clean energy, can solve the problems of small specific surface area, large material size, poor rate performance, etc., and achieves low preparation cost, great practical significance, and simple operation. Effect
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Embodiment 1
[0025] Weigh 6g of zinc nitrate and 0.8g of terephthalic acid, dissolve them in 100ml of DMF, and react at 120°C for 24h to obtain the MOFs precursor. The MOFs precursor was kept under nitrogen protection at 1000 °C for 4 h, and then naturally cooled to room temperature to obtain the target carbonized product.
[0026] As shown in Figure 1 and Figure 2, the specific surface area of the product obtained is 2565m 2 / g, the pore volume is 2.76cm 3 / g, the micropore diameter is 1.3nm, and the mesopore diameter is 6.4nm.
[0027] The test electrode is made by coating method. The specific process is as follows: mix the obtained porous carbon material, acetylene black and binder PVDF according to the mass ratio of 8:1:1, fully grind and disperse with N-methylpyrrolidone, prepare a uniform paste and apply it on on a round nickel foam, and then dried in a vacuum oven at 120°C for 12 hours and then pressed into thin sheets. The battery test uses a button-type CR2032 system to simu...
Embodiment 2
[0030]Weigh 4.5g of zinc nitrate and 0.8g of terephthalic acid, dissolve in 150ml of DEF, and react at 105°C for 24h to obtain the MOFs precursor. The MOFs precursor was kept under nitrogen protection at 1000 °C for 4 h, and then naturally cooled to room temperature to obtain the target carbonized product.
[0031] The specific surface area of the product obtained is 2328m 2 / g, the pore volume is 2.16cm 3 / g, the micropore diameter is 1.2nm, and the mesopore diameter is 6.1nm. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity of 50 cycles at a current density of 50 mA / g was 1451 mAh / g. The reversible capacity is 745mAh / g after 300 cycles at a current density of 500mA / g.
Embodiment 3
[0033] Weigh 6g of zinc nitrate and 0.8g of terephthalic acid, dissolve them in 100ml of DMF, and react at 120°C for 24h to obtain the MOFs precursor. The MOFs precursor was kept under nitrogen protection at 1100 °C for 4 h, and then naturally cooled to room temperature to obtain the target carbonized product.
[0034] The specific surface area of the product obtained is 2574m 2 / g, the pore volume is 2.65cm 3 / g, the micropore diameter is 1.3nm, and the mesopore diameter is 5.8nm. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity of 50 cycles at a current density of 50 mA / g was 1522 mAh / g. The reversible capacity is 782mAh / g after 300 cycles at a current density of 500mA / g.
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Abstract
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