A kind of negative plate and battery
A negative electrode sheet and battery technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor fast charging performance of batteries
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Embodiment 1
[0061] Embodiment 1: prepare 2 graphite slurries: the B slurry based on high-pressure compacted graphite (1.83g / cm3), the C slurry based on 3C lithium window graphite, the formulas of these two graphite slurries Both are 96.5%, namely graphite: binder: CMC: conductive agent = 96.5%: 1.5%: 1.5%: 0.5%, the solid content is 40% to 49%, and the viscosity is 2000 to 6000mPa.s;
[0062] Use a double-cavity die coater to coat the two types of graphite slurry on a 5 μm copper foil (light foil, not coated with carbon) at the same time. The coating process is as follows: Use a double-cavity die coater to coat B and C at the same time Slurry, wherein the bottom layer is coated with slurry B, which is recorded as layer B, which is a high-pressure compacted graphite layer, and the coating thickness is 80 μm; the surface layer is coated with slurry C, which is recorded as layer C, which is a fast-filling graphite layer, and the coating thickness is 40 μm.
Embodiment 2
[0063] Example 2: First, carbon-coat 5 μm copper foil, and use gravure coating equipment to maintain the thickness of both sides at 1-1.5 μm.
[0064] Then prepare 2 graphite slurries: B slurry based on high-pressure compacted graphite (1.83g / cm3), C slurry based on 3C lithium analysis window graphite, the formula of these two graphite slurries is 96.5 %, namely graphite: binder: CMC: conductive agent=96.5%: 1.5%: 1.5%: 0.5%, solid content is 40%~49%, viscosity is 2000~6000mPa.s.
[0065] Finally, the two types of graphite slurry are coated on the carbon-coated copper foil at the same time with a double-cavity die coater. The bottom layer is coated with slurry B, denoted as B layer, which is a high-pressure compacted graphite layer, and the coating thickness is 80 μm; the surface layer is coated with C slurry, denoted as C layer, which is a fast-filling graphite layer, and the coating thickness is 40 μm.
Embodiment 3
[0066] Example 3: First, carbon-coat 5 μm copper foil, and use gravure coating equipment to maintain the thickness of both sides at 1-1.5 μm.
[0067] Then prepare 2 graphite slurries: A slurry based on 1.5C lithium analysis window graphite, B slurry based on high-pressure compacted graphite (1.83g / cm3), the formulas of these two graphite slurries are 96.5%, namely graphite: binder: CMC: conductive agent = 96.5%: 1.5%: 1.5%: 0.5%, the solid content is 40% to 49%, and the viscosity is 2000 to 6000mPa.s.
[0068] Finally, use a double-cavity die coater to coat the two types of graphite slurry on the carbon-coated copper foil at the same time. The coating process is as follows: use a double-cavity die coater to coat A and B slurry simultaneously, wherein The bottom layer is coated with slurry A, denoted as layer A, which is the graphite layer of the 1.5C lithium analysis window, and the coating thickness is 80 μm; the surface layer is coated with slurry B, denoted as layer B, whi...
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