Current collector for bipolar lithium ion secondary battery
A secondary battery, lithium ion technology, applied in secondary batteries, electrode collector coatings, battery electrodes, etc., can solve problems such as battery capacity reduction
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Embodiment 1
[0115]
[0116] As the first conductive layer, a conductive resin film (film thickness: 50 μm) obtained by mixing 10 parts by mass of ketjen black with 100 parts by mass of polyimide (PI) was produced. On one surface of the first conductive layer, copper was deposited to a thickness of 20 nm by sputtering to form a first conductive layer-metal layer laminate.
[0117] On the other hand, a conductive resin film (film thickness: 100 μm) obtained by mixing 10 parts by mass of ketjen black with 100 parts by mass of polypropylene (PP) was produced to form a barrier resin layer.
[0118] Then, the metal layer-side surface of the first conductive layer-metal layer laminate was superimposed on the barrier resin layer, and heat-sealed at 160° C. for 10 minutes. Thus, making a figure 1 A current collector for a bipolar lithium ion secondary battery with such a three-layer structure.
[0119]
[0120] Negative electrode active material slurry was prepared by mixing 90 parts by mass...
Embodiment 2
[0127] In producing the current collector, first, copper was deposited to a thickness of 20 nm by sputtering on one surface of the first conductive layer. Then, the deposited copper was strongly heated at 150° C. to form copper oxide to form a first conductive layer-metal layer laminate. That is, a current collector in which the metal layer is made of copper oxide is fabricated. Except for this, a bipolar secondary battery was fabricated by the same method as in Example 1 above.
Embodiment 3
[0129] On one side of the first conductive layer, 50 nm thick chromium was deposited by sputtering to form a metal elution preventing layer. Then, similarly, copper was deposited to a thickness of 20 nm by sputtering to form a laminated body of the first conductive layer-metal elution prevention layer-metal layer. Then, the surface of the first conductive layer-metal layer laminate on the metal layer side and the barrier resin layer were laminated, and thermally welded at 160° C. for 10 minutes, thereby producing a current collector for a bipolar lithium ion secondary battery. body. That is, a current collector having a metal elution preventing layer on the surface of the metal layer facing the first conductive layer was fabricated. Except for this, a bipolar secondary battery was fabricated by the same method as in Example 1 above.
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