A kind of lithiation method of silicon negative plate for lithium ion battery
A lithium-ion battery, silicon anode technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of dust generation, uneven dispersion of lithium powder, and reduced conductivity of battery materials, avoiding lithiation, operation, etc. Safe and reliable, the effect of reducing the first specific capacity loss
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Embodiment 1
[0026] A method for lithiation of a silicon negative plate for a lithium ion battery, comprising the following steps:
[0027] (1) Physical rolling: such as figure 1 As shown, the side of the lithium foil 3 without the polyolefin protective film layer is pasted on the surface of the silicon negative electrode sheet 2 and rolled by a roller press to form a composite silicon sheet 1. The thickness of the lithium foil is preferably 3 um, and the lithium foil covers the part Silicon negative plate. Such as figure 2 As shown, the lithium foil is partially embedded in the silicon negative electrode in the thickness direction, preferably 1 / 3 of the lithium foil is partially embedded in the thickness direction. In order to ensure stable rolling and avoid lithiation during rolling, the operating temperature of the rolling machine is 25 ℃, and the rolling speed is 0.2m / s;
[0028] (2) Assembling the battery: put the composite silicon wafer, the positive electrode sheet, the separato...
Embodiment 2
[0032] A method for lithiation of a silicon negative plate for a lithium ion battery, comprising the following steps:
[0033] (1) Physical rolling: such as figure 1 As shown, the side of the lithium foil 3 without the polyolefin protective film layer is pasted on the surface of the silicon negative electrode sheet 2 and rolled by a roller press to form a composite silicon sheet 1. The thickness of the lithium foil is preferably 8 um, and the lithium foil covers the part Silicon negative plate. Such as figure 2 As shown, the lithium foil is partially embedded in the silicon negative electrode in the thickness direction, preferably 1 / 2 of the lithium foil is embedded in the thickness direction. In order to ensure stable rolling and avoid lithiation during rolling, the operating temperature of the rolling machine is 40 ℃, and the rolling speed is 0.28m / s;
[0034] (2) Assembling the battery: put the composite silicon wafer, the positive electrode sheet, the separator, and th...
Embodiment 3
[0038] A method for lithiation of a silicon negative plate for a lithium ion battery, comprising the following steps:
[0039] (1) Physical rolling: such as figure 1 As shown, the side of the lithium foil 3 without the polyolefin protective film layer is pasted on the surface of the silicon negative electrode sheet 2 and rolled by a roller press to form a composite silicon sheet 1. The thickness of the lithium foil is preferably 15 um, and the lithium foil covers the part Silicon negative plate. Such as figure 2 As shown, the lithium foil is partially embedded in the silicon negative electrode in the thickness direction, preferably 3 / 5 of the lithium foil is partially embedded in the thickness direction. In order to ensure stable rolling and avoid lithiation during rolling, the operating temperature of the rolling machine is 35 ℃, and the rolling speed is 0.3m / s;
[0040] (2) Assembling the battery: put the composite silicon wafer, the positive electrode sheet, the separat...
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