Safety layer and lithium secondary battery
A technology of safety layer and absorption layer, which is applied in the field of safety layer and lithium secondary battery, can solve the problems that cannot be solved fundamentally and have high safety risks, and achieve the effects of slowing growth, improving safety performance, and prolonging cycle life
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Embodiment 1
[0055] (1) Preparation of positive electrode sheet
[0056] The positive electrode active material Li 2 CoO 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone solvent system at a weight ratio of 94:3:3, and then coated on the positive electrode current collector Al foil, After drying and cold pressing, the positive electrode sheet is obtained.
[0057] (2) Preparation of negative electrode sheet
[0058] Negative electrode active material artificial graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), thickener sodium carboxymethyl cellulose (CMC) are in deionized water solvent system according to weight ratio 96:1:1.5:1.5 After being fully stirred and mixed uniformly, it is coated on the Cu foil of the negative electrode current collector, dried and cold pressed to obtain the negative electrode sheet.
[0059] (3) Preparation of security layer
[0060...
Embodiment 2-8
[0064] The preparation process of the lithium-ion secondary battery is the same as that of Example 1, except that the thickness of the absorbing layer or the electron-insulating ion-conducting layer is different.
Embodiment 9
[0066] The preparation process of lithium ion secondary battery is identical with embodiment 1, difference is:
[0067] (3) Preparation of security layer
[0068] Carbon-coated silicon compounds are used instead of graphite.
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