Preparation method for graphite and silicon composite anode material
A technology of silicon composite material and negative electrode material, applied in the field of materials, can solve the problems of increased risk, difficulty in operation, cumbersome process, etc., and achieve the effects of low cost, simple process, and easy availability of raw materials
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Embodiment 1
[0028] Weigh 1g of nano-silicon (D50:30nm) and 20g of expanded graphite (150 mesh, purity of 99.9%, expansion degree of 300mL / g), add 1g of nano-silicon to 500mL of ethanol and fully disperse to obtain nano-silicon organic Dispersions. Then add the expanded graphite into the organic dispersion of nano-silicon and stir the expanded graphite to fully absorb the solution. Then, the saturated expanded graphite was fished out, and dried at 60° C. under vacuum condition, so as to obtain the expanded graphite-silicon composite material. Finally, the obtained expanded graphite-silicon composite material is rolled by a pair of rollers to finally obtain a graphite-silicon composite negative electrode material.
Embodiment 2
[0030] Weigh 0.5g of nano-silicon (D50:30nm) and 20g of expanded graphite (200 mesh, purity of 99.9%, expansion degree of 200mL / g), add 0.5g of nano-silicon to 500mL of toluene and fully disperse to obtain nano-silicon of organic dispersions. Then add the expanded graphite into the organic dispersion of nano-silicon and stir the expanded graphite to fully absorb the solution. Then, the saturated expanded graphite is fished out, and dried at 100° C. under vacuum condition, so as to obtain the expanded graphite-silicon composite material. Finally, the obtained expanded graphite-silicon composite material is rolled by a pair of rollers to finally obtain a graphite-silicon composite negative electrode material.
Embodiment 3
[0032] Weigh 0.2g of nano-silicon (D50:30nm) and 20g of expanded graphite (300 mesh, purity of 99.9%, expansion of 150mL / g), add 0.2g of nano-silicon to 500mL of acetone and fully disperse to obtain nano-silicon of organic dispersions. Then add the expanded graphite into the organic dispersion of nano-silicon and stir the expanded graphite to fully absorb the solution. Then, the saturated expanded graphite was fished out, and dried at 150° C. under vacuum condition, so as to obtain the expanded graphite-silicon composite material. Finally, the obtained expanded graphite-silicon composite material is rolled by a pair of rollers to finally obtain a graphite-silicon composite negative electrode material.
[0033] The electrochemical performance test results of each lithium-ion battery prepared above are shown in Table 1:
[0034] Table 1 Electrochemical performance test table of lithium ion battery
[0035]
[0036] Compared with the technical scheme of the prior art...
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