Method for pre-lithiation of lithium-ion battery negative electrode and preparation method of pre-lithiation lithium-ion battery
A lithium-ion battery and negative electrode technology, which is applied in the direction of battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve the problem of low efficiency of lithium-ion batteries for the first time
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[0034] After the negative electrode of the lithium-ion battery is pre-lithiated, the application then proceeds to the preparation of the lithium-ion battery, specifically as follows figure 1 Shown, the application also provides a kind of preparation method of the lithium-ion battery through pre-lithiation, comprises the following steps:
[0035] A) pressing the lithium foil on the negative electrode sheet; the negative electrode sheet is in a semi-dry state;
[0036] B) placing the negative electrode sheet obtained in step A) in an airtight bag for vacuum treatment;
[0037] C) Assemble the negative electrode sheet and the positive electrode sheet obtained in step B), inject electrolyte solution, and then dissolve into volume after standing to obtain a lithium ion battery.
[0038] After the lithium-ion battery described in this application is pre-lithiated, conventional preparation is carried out. Steps A) and B) have been described in detail above, and will not be repeated ...
Embodiment 1
[0043] Lithium-rich manganese is used as the positive electrode material, and silicon carbon is used as the negative electrode material;
[0044]Coat the positive and negative electrodes on the current collector; after pressing and cutting, the negative electrode sheet (water content is 600-1000ppm) and the positive electrode sheet are obtained; the ultra-thin lithium foil (3-7μm) is pressed on the cut sheet by rolling Put the cut negative electrode sheet on the vacuum treatment and let it stand for 12 hours, then assemble the battery with the cut lithium-rich positive electrode sheet; then inject the electrolyte and let it stand at 20-45°C for 12-24 hours, and then perform chemical composition and volume to obtain Lithium Ion Battery.
[0045] figure 2 Be the photo before and after the pre-lithium of the negative electrode sheet of the present embodiment, by figure 2 It can be seen that the lithium foil on the surface of the negative electrode sheet has been used up after...
Embodiment 2
[0047] The preparation method is the same as in Example 1, except that: the negative electrode material is hard carbon; the water content of the negative electrode sheet is 1000ppm-1500ppm; the thickness of the lithium foil is 5-10 μm.
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