A kind of preparation method and application of porous negative electrode material for lithium ion battery
A technology of lithium-ion batteries and negative electrode materials, applied in the direction of battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problems of unsuitability for large-scale industrial production, high complexity of equipment, and high cost of raw materials. Achieve the effect of facilitating large-scale production and application, alleviating the problem of volume expansion, and simple pore-making process
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Embodiment 1
[0027] A preparation method of a porous negative electrode material for a lithium ion battery, the steps are as follows:
[0028] 1) Preparation of Ni-Si-Al alloy ingot
[0029] According to target alloy composition Ni 15 Si 5 Al 80 Atomic ratio of 99.99% nickel, 99.99% pure silicon, and 99.99% pure aluminum block are used as raw materials for raw material preparation. When preparing materials, the amount of raw materials is multiplied by a correction factor to reduce the burning of alloys during smelting. Composition deviation caused by damage. According to the test results of burning loss obtained by the inventor in a large number of experiments, the correction coefficients are 1.04 for nickel, 1.02 for silicon, and 1.05 for aluminum. -3 Pa, the argon gas with a purity of 99.999% is introduced to -0.05MPa, and the arc smelting starts. During the smelting process, all the nickel and all the silicon are smelted, and all the aluminum is smelted separately. The smelting proc...
Embodiment 2
[0039] A preparation method of a porous negative electrode material for a lithium ion battery, the steps are as follows:
[0040] 1) The preparation of the Ni-Si-Al alloy ingot is basically the same as in Example 1, except that the target alloy composition is Ni 16 Si 4 Al 80 ;
[0041] 2) The preparation of the Ni-Si-Al precursor alloy strip is exactly the same as in Example 1;
[0042] 3) Preparation of bimodal nanoporous anode materials
[0043] Place the dealloyed precursor strips prepared above in a sodium hydroxide solution with a concentration of 5.1wt% and a temperature of 25°C, and freely corrode for 230 minutes, then raise the solution to 85°C and corrode for 20 minutes, with a heating rate of 5°C / min , the reaction product was separated with filter paper, and then washed twice with deionized water to remove the residual sodium hydroxide component on the surface of the sample, and the solid-liquid material was separated with a centrifuge, and then the product was...
Embodiment 3
[0048] A preparation method of a porous negative electrode material for a lithium ion battery, the steps are as follows:
[0049] 1) The preparation of the Ni-Si-Al alloy ingot is basically the same as in Example 1, except that the target alloy composition is Ni 14 Si 6 Al 80 ;
[0050] 2) The preparation of the Ni-Si-Al precursor alloy strip is exactly the same as in Example 1;
[0051] 3) Preparation of bimodal nanoporous anode materials
[0052] Place the dealloyed precursor strips prepared above in a sodium hydroxide solution with a concentration of 5.3wt% and a temperature of 25°C, and freely corrode for 250 minutes, then raise the solution to 85°C and corrode for 23 minutes, with a heating rate of 5°C / min , the reaction product was separated with filter paper, and then washed twice with deionized water to remove the residual sodium hydroxide component on the surface of the sample, and the solid-liquid material was separated with a centrifuge, and then the product was...
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