Electrochemical device and electronic device comprising same
An electrochemical and electrode assembly technology, applied in the field of electrochemistry, can solve problems such as unfavorable energy density of lithium-ion batteries, safety risks of lithium-ion batteries, and corrosion reactions, so as to reduce the risk of corrosion reactions, improve anti-corrosion performance, and improve The effect of energy density
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[0096] The present application has no special limitation on the preparation process of the electrochemical device, as long as the purpose of the present application can be achieved. For example, an electrochemical device can be prepared by the following process: overlap the positive pole piece and the negative pole piece through a separator, and put it into the casing after winding or folding as required, inject the electrolyte into the casing and seal it; Alternatively, the negative pole piece and the positive pole piece are stacked through separators to form a stack, and then the four corners of the entire stack structure are fixed with adhesive tape, placed in an aluminum shell, and the electrolyte is injected into the shell and sealed to obtain electrochemical device. In addition, anti-overcurrent elements, guide plates, etc. can also be placed in the casing as needed, so as to prevent pressure rise and overcharge and discharge inside the electrochemical device.
[0097] ...
Embodiment 1
[0114]
[0115] Mix the first negative electrode active material, conductive carbon black (Super P), and styrene-butadiene rubber (SBR) in a weight ratio of 96:1.5:2.5, and then add deionized water as a solvent to prepare the first negative electrode active material with a solid content of 70%. paste, and stir well. The second negative electrode active material, Super P, and SBR were mixed according to a weight ratio of 96:1.5:2.5, and then deionized water was added as a solvent to prepare a second slurry with a solid content of 70%, and stirred evenly. The first slurry is evenly coated on the first coating area of the negative electrode current collector copper foil with a thickness of 8 μm, the second slurry is evenly coated on the second coating area, and dried at 110 ° C to obtain A negative electrode sheet coated with a negative active material on one side with a coating thickness of 130 μm. After the above steps are completed, the single-side coating of the negative...
Embodiment 16
[0125]
[0126] Except that the negative electrode sheet was cut into a specification of 41 mm×61 mm, the rest was the same as that of Example 1.
[0127]
[0128] Except that the positive pole piece was cut into a specification of 38 mm×58 mm, the rest was the same as that of the embodiment 1.
[0129] and are the same as in Example 1.
[0130]
[0131] Stack the positive pole piece, separator, and negative pole piece prepared above to form a laminate, so that the separator is in the middle of the positive pole piece and the negative pole piece to play the role of isolation, and then use tape to fix the four corners of the entire laminated structure. Get the electrode assembly. Put the electrode assembly into the aluminum-plastic film casing, remove the moisture at 80°C, inject the prepared electrolyte, and obtain the lithium-ion battery through the processes of vacuum packaging, standing, forming, and shaping.
[0132] Example 2 to Example 15, Comparative Example 1...
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