Anode and secondary battery
A technology of secondary battery and negative electrode current collector, applied in the direction of secondary battery, negative electrode, battery electrode, etc., can solve the problems of short circuit, damage to the diaphragm, difficult to obtain cycle characteristics, etc., to suppress the loss of battery capacity, prevent Expansion and contraction, the effect of less voltage drop
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Embodiment 1-1～1-16
[0243] Manufactured by the following steps Figure 12 to Figure 14 The laminated film type secondary battery shown. A secondary battery was produced as a lithium ion secondary battery in which the capacity of the negative electrode 54 was expressed based on intercalation and deintercalation of lithium.
[0244] First, the positive electrode 53 is formed. First, lithium carbonate (Li 2 CO 3 ) and cobalt carbonate (CoCO 3 ) are mixed in a molar ratio of 0.5:1. After that, the mixture was fired at 900° C. for 5 hours in air. Thus, the lithium-cobalt composite oxide (LiCoO 2 ). Subsequently, 91 parts by mass of lithium cobalt composite oxide as a positive electrode active material, 6 parts by mass of graphite as a positive electrode conductor, and 3 parts by mass of polyvinylidene fluoride as a positive electrode binder were mixed to obtain a positive electrode mixture . After that, the cathode mixture was dispersed in N-methyl-2-pyrrolidone to obtain paste cathode mixtur...
Embodiment 2-1～2-6
[0259] The procedure was carried out in the same manner as in Examples 1-1 to 1-16, except that two or more of the forming materials shown in Table 2 were used as the forming materials of the coating layer 54C, and thus a layer containing two kinds was formed. or more oxide coatings 54C.
[0260] The cycle characteristics and voltage retention characteristics of the secondary batteries of Examples 2-1 to 2-6 were examined. The results shown in Table 2 were obtained.
[0261] Table 2
[0262]
[0263] As shown in Table 2, in Examples 2-1 to 2-6 in which the coating layer 54C containing two kinds of oxides was formed, results similar to Table 1 were also obtained. That is, as in Examples 1-1 to 1-3, 1-7, and 1-9, compared with Comparative Example 1, in Examples 2-1 to 2-6, the discharge capacity retention ratio was significantly increased and The incidence of voltage dips is significantly reduced.
[0264]In particular, compared with Examples 1-1 to 1-3, 1-7, and 1-9 in w...
Embodiment 3-1～3-16
[0267] The steps were performed in the same manner as in Examples 1-1 to 1-16, except that the metal elements shown in Table 3 were included in the negative electrode active material. In forming the anode active material layer 54B, both surfaces of the anode current collector 54A were sprayed with molten metal powder and silicon powder together, and the content of the metal element in the anode active material was 5 atomic %. Embodiment 3-17~3-20
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