Negative electrode for nonaqueous electrolyte secondary battery and process of producing the same
A non-aqueous electrolyte and secondary battery technology, applied in the negative electrode field, can solve the problem of large irreversible capacity
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Embodiment 1
[0097] The negative electrode shown in Fig. 5 was fabricated. The copper carrier foil (thickness: 35 μm) obtained by electrolysis was washed with acid for 30 seconds at room temperature. This was followed by washing with pure water for 30 seconds at room temperature. Next, the carrier foil was dipped in a tin plating bath having the following composition and plated to form a coating made of tin. The current density is set to 2A / dm 2 , and the bath temperature was set at 30 °C. A tin electrode was used for the anode. The current uses direct current. The coating was unevenly formed to a thickness of 20 μm. After taking it out of the plating bath, it was washed with pure water for 30 seconds, dried in the air, and left to stand for 15 minutes to oxidize the coating.
[0098] ·SnSO 4 50g / l
[0099] ·H 2 SO 4 100g / l
[0100] ·Cresolsulfonic acid 100g / l
[0101] The carrier foil on which the covering was formed was immersed in a 3 g / l CBTA solution maintained ...
Embodiment 2～4 and comparative example 2
[0124] In the present example and the comparative example, the difference in the performance of the negative electrode due to the difference in the amount of metal lithium contained in the negative electrode was evaluated. A negative electrode was produced in the same manner as in Example 1, except that the negative electrode precursor was not subjected to drilling processing using a YAG laser, and the amount of metal lithium was set to the value shown in Table 2. The obtained negative electrodes had the structure shown in FIG. 1 (except for Comparative Example 1). As a result of electron microscope observation, it was confirmed that a large number of fine pores were formed in the surface layer for current collection.
[0125] With regard to the obtained negative electrode, the charge capacity and discharge capacity after one cycle were measured. The results are shown in Table 2. In Table 2, the capacity reversibility after one cycle is also described at the same time. The ...
Embodiment 5 and 6 and comparative example 3 and 4
[0129] In the present example and the comparative example, the difference in the performance of the negative electrode due to the difference in the water content in the negative electrode was evaluated. A negative electrode was prepared in the same manner as in Example 1, except that the negative electrode precursor was not subjected to hole drilling using a YAG laser, and the amount of metal lithium was set to 40% of the theoretical initial charging capacity of silicon. The obtained negative electrode had the structure shown in FIG. 1 . As a result of electron microscope observation, it was confirmed that a large number of fine pores were formed in the surface layer for current collection. The obtained negative electrode was dried in a vacuum oven at 160° C. for 1 week so that the moisture content was 390 ppm (Example 5). The obtained negative electrode was dried in a vacuum oven at 160° C. for 3 hours so that the moisture content was 870 ppm (Example 6).
[0130] The diffe...
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Abstract
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