Negative electrode material and preparation method thereof, and lithium ion battery
A technology of negative electrode materials and carbon materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in commercial application, poor electrochemical performance, and decreased cycle stability, so as to improve battery cycle performance, reduce Expansion rate, effect of reducing porosity
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[0112] The preparation method of the negative electrode material of one embodiment, comprises the following steps:
[0113] Step S10, preparing a precursor after mixing the active material, the first carbon source and the solvent;
[0114] Step S20, performing densification treatment on the precursor to obtain aggregates, the porosity of the aggregates is ≤10% and the compressive hardness is ≥100MPa;
[0115] In step S30, the aggregates are subjected to carbon coating treatment to obtain negative electrode materials.
[0116] The aggregate prepared in this embodiment includes active material and carbon material, wherein, the porosity of the aggregate is ≤10%, and the compressive hardness of the aggregate is ≥100Mpa.
[0117] The preparation method of the negative electrode material provided by this application uses the densification treatment of the precursor to improve the compressive hardness of the negative electrode material, enhance the stability of the particle structur...
Embodiment 1
[0179] The preparation method of the negative electrode material of the present embodiment comprises the following steps:
[0180] (1) Add Si powder with a median particle size of 100nm, SiO particles with an aspect ratio of 22, lauric acid and phenolic resin in a mass ratio of 60:4.5:3.9:22.9 to 40% ethylene glycol solution, and ultrasonically disperse The dispersion solution was obtained in 10 minutes, and then the dispersion solution was ground and dispersed in a ball mill for 4 hours to obtain a precursor solution, and then dried at a temperature of 190° C. for 3 hours to obtain a precursor.
[0181] (2) Put the precursor in the fusion machine, the speed of the fusion machine is 500r / min; the width of the tool gap of the fusion machine used for mechanical fusion is 0.05cm; the mechanical fusion time is 0.5h. Put the fused material in a heat treatment furnace , and then pass nitrogen gas under the condition of 600° C., conduct a heat treatment, keep the temperature for 3 ho...
Embodiment 2
[0186] The preparation method of the negative electrode material of the present embodiment comprises the following steps:
[0187] (1) Si powder with a median particle size of 80nm and GeO with an aspect ratio of 12 2 Particles, palmitic acid and polyvinylpyrrolidone were added to the propanol solution according to the mass ratio of 40:1.8:8:21.9, ultrasonically dispersed for 15 minutes to obtain a dispersion solution, and then the dispersion solution was placed in a ball mill to grind and disperse for 3 hours to obtain a precursor solution , and then dried at 190° C. for 3 hours to obtain a precursor.
[0188] (2) Put the precursor in the fusion machine, the rotation speed of the fusion machine is 800r / min; the width of the tool gap of the fusion machine is 0.15cm; the fusion time is 1.5h. The fused material was placed in a heat treatment furnace, then nitrogen gas was introduced, the temperature was raised to 900° C. for a heat treatment, and the temperature was kept for 3 ...
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Abstract
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