A kind of lithium-ion battery composite negative electrode material and preparation method thereof, lithium-ion battery
A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of material rate performance, low temperature performance, and lack of low temperature performance, so as to improve low temperature discharge capacity, layer The effect of large spacing and improved magnification performance
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Embodiment 1
[0034] The preparation method of the lithium-ion battery composite negative electrode material of the present embodiment comprises the following steps:
[0035] 1) Add 8g of polyvinylidene fluoride to 500ml of N-methylpyrrolidone and stir for 1h, let it stand for 3h to obtain a binder solution, add 3g of LiAlO 2 And stir for 2 hours, add 40g of hard carbon, and stir for 3 hours to obtain a hard carbon composite solution;
[0036] 2) Add 100g of natural graphite to the hard carbon composite solution obtained in step 1), stir to mix evenly, dry at 80°C for 2 hours, pulverize to obtain the coated precursor, and then transfer the obtained coated precursor to a tube furnace, Under the protection of nitrogen, the temperature was raised to 800°C at a heating rate of 5°C / min for 3 hours, and then the temperature was naturally cooled to room temperature to obtain a graphite material coated with a hard carbon composite material;
[0037] 3) Take 3g of polyvinylidene fluoride and add it...
Embodiment 2
[0041] The preparation method of the lithium-ion battery composite negative electrode material of the present embodiment comprises the following steps:
[0042] 1) Add 5g of polyvinylidene fluoride to 500ml of N-methylpyrrolidone, stir for 1h, let it stand for 3h to obtain a binder solution, add 1g of LiAlCl 4 And stir for 2 hours, add 30g of hard carbon, and stir for 3 hours to obtain a hard carbon composite solution;
[0043] 2) Add 100g of natural graphite to the hard carbon composite solution obtained in step 1), stir to mix evenly, dry at 60°C for 5h, pulverize to obtain the coated precursor, and then transfer the obtained coated precursor to a tube furnace, Under the protection of nitrogen, the temperature was raised to 600°C at a heating rate of 1°C / min and kept for 5 hours, and then the temperature was naturally cooled to room temperature to obtain a graphite material coated with a hard carbon composite material;
[0044]3) Add 1 g of polyvinylidene fluoride to 500 ml...
Embodiment 3
[0048] The preparation method of the lithium-ion battery composite negative electrode material of the present embodiment comprises the following steps:
[0049] 1) Add 10g of polyvinylidene fluoride to 500ml of N-methylpyrrolidone and stir for 1h, let it stand for 3h to obtain a binder solution, add 5g of LiAlO 2 And stir for 2 hours, add 50g of hard carbon, and stir for 3 hours to obtain a hard carbon composite solution;
[0050] 2) Add 100g of artificial graphite to the hard carbon composite solution obtained in step 1), stir to mix evenly, dry at 100°C for 1 hour, pulverize to obtain the coated precursor, and then transfer the obtained coated precursor to a tube furnace, Under the protection of nitrogen, the temperature was raised to 900°C at a heating rate of 10°C / min for 1 hour, and then the temperature was naturally cooled to room temperature to obtain a graphite material coated with a hard carbon composite material;
[0051] 3) Add 5 g of polyvinylidene fluoride to 500...
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