Battery negative electrode sheet, preparation method therefor and lithium ion battery
A technology of battery negative electrode and negative electrode sheet, applied in electrode manufacturing, battery electrode, electrode current collector coating and other directions, can solve the problems of increased negative electrode volume expansion rate, unsatisfactory battery energy density, low crystalline silicon content, etc. Volume expansion buffer, improved structural stability and high energy density
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[0027] On the other hand, the embodiment of the present invention also provides a preparation method of the battery negative electrode sheet mentioned above. The preparation method process is as follows figure 2 shown, including the following steps:
[0028] S01: preparing amorphous silicon, conductive agent and binder into negative electrode slurry;
[0029] S02: apply the negative electrode slurry on the negative electrode current collector, and then directly perform drying treatment to form a negative electrode sheet;
[0030] S03: Perform surface density detection on the pole piece, and select the negative pole piece that meets a predetermined surface density value.
[0031] Wherein, the types and preferred dosage ratios of the amorphous silicon, the conductive agent and the binder in the step S01 are as described above in the negative electrode sheet of the battery, and will not be described again in order to save space.
[0032] In addition, the method for preparing ...
Embodiment 11
[0042] This embodiment provides a battery negative electrode sheet and a preparation method thereof. The negative electrode sheet of the battery includes a nickel current collector and a negative electrode active layer combined on the nickel-based fluid. Wherein, the negative electrode active layer includes a negative electrode active material, a conductive agent and a binder in a weight ratio of 89:5:6, the negative electrode active material is amorphous silicon, the conductive agent is CNT, and the binder The agent is CMC and SBR, the thickness of the negative electrode active layer is 30μm, and the surface density is 2mg / cm 2 .
[0043] The preparation method of the negative plate of the battery in this embodiment is as follows:
[0044] S11: According to the composition ratio of the active layer of the negative electrode sheet of the battery in Example 1, the amorphous silicon, the conductive agent and the binder are prepared into the negative electrode slurry;
[0045]...
Embodiment 12
[0049] This embodiment provides a battery negative electrode sheet and a preparation method thereof. The negative electrode sheet of the battery includes a nickel current collector and a negative electrode active layer combined on the nickel-based fluid. Wherein, the negative electrode active layer includes a negative electrode active material, a conductive agent and a binder in a weight ratio of 94:3:3, the negative electrode active material is amorphous silicon, the conductive agent is SP, and the binder The agent is CMC and LA133, the thickness of the negative electrode active layer is 40μm, and the surface density is 2.5mg / cm 2 .
[0050] The preparation method of the negative plate of the battery in this embodiment is as follows:
[0051] S11: According to the composition ratio of the active layer of the negative electrode sheet of the battery in Example 1, the amorphous silicon, the conductive agent and the binder are prepared into the negative electrode slurry;
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