Negative electrode for nonaqueous secondary battery
A non-aqueous electrolyte, secondary battery technology, applied in the field of negative electrodes, can solve the problems of shedding of active materials, difficulty in maintaining electrical conductivity, and difficulty in negative electrode cycle characteristics.
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Embodiment 1
[0091] According to the method shown in Figure 2 to manufacture such as figure 1 Negative terminal shown. First, the electrolytically obtained copper carrier foil (35 μm in thickness) was washed with acid for 30 seconds at room temperature. Continue washing with pure water for 30 seconds at room temperature. Next, the carrier foil was immersed in a 3.5 g / l CBTA solution in a state maintained at 40° C. for 30 seconds. Thus, the peeling process is performed. After the stripping treatment, it was lifted out of the solution and washed with pure water for 15 seconds.
[0092] On the rough surface of the carrier foil (surface roughness Ra = 0.5 μm), a coating solution having a concentration of 2.5% by weight obtained by dissolving polyvinylidene fluoride in N-methylpyrrolidone was applied. liquid. After the solvent evaporates to form a coating film, the carrier foil is immersed in H 2 SO 4 / CuSO 4 Electroplating is carried out in a plating bath. Thus, a current collector la...
Embodiment 2
[0102] According to the method shown in Figure 5 to manufacture such as Figure 4 Negative terminal shown. First, on the rough surface of the carrier foil (surface roughness Ra = 0.5 μm), a concentration of 2.5% by weight of polyvinylidene fluoride dissolved in N-methylpyrrolidone was applied. Coating solution. After the solvent evaporates to form a coating film, the carrier foil is immersed in H 2 SO 4 / CuSO 4 Electroplating is carried out in a plating bath. Thus, a current collector layer made of copper was formed on the coating film. The composition of the plating bath is CuSO 4 250g / l, H 2 SO 4 70g / l. The current density is set to 5A / dm 3 . The collector layer was formed with a thickness of 5 μm. After being lifted from the plating bath, it was washed with pure water for 30 seconds and dried in the atmosphere.
[0103] Next, a slurry containing negative electrode active material particles was applied on the collector layer so as to have a film thickness of 15 ...
Embodiment 3
[0111] made as Image 6 Negative terminal shown. First, according to the same operation as in Example 2, a negative electrode precursor supported by a carrier foil was obtained. Next, apart from the negative electrode precursor, a metal lithium layer with a thickness of 10 μm was formed on one surface of a copper foil (collector layer) with a thickness of 5 μm by vacuum evaporation method. Attach this copper foil to the negative electrode precursor made earlier to make it a whole. The lamination is carried out in such a way that the metal lithium layer on the copper foil is docked with the active material layer on the negative electrode precursor.
[0112] Next, a YAG laser is irradiated toward the copper foil to regularly form vertical holes penetrating the copper foil and the negative electrode precursor. The diameter of the longitudinal holes is set to 25 μm, and the interval is set to 100 μm (10000 holes / cm 2 ). Finally, the carrier foil and the collector layer were p...
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Abstract
Description
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