All-solid-state battery and preparation method thereof
An all-solid-state battery, solid-state electrolyte technology, applied in the manufacture of electrolyte batteries, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem that all-solid-state batteries cannot achieve self-sustaining voltage, and achieve the effect of self-sustaining pressure
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preparation example Construction
[0032] According to the preparation method of the all-solid-state battery of the present invention, in the first aspect, polycarbonate is contained in the positive electrode sheet and the solid electrolyte film layer, and in the process of heating and pressing, polycarbonate will decompose, due to polycarbonate The decomposition of alkenyl ester will form holes in the positive electrode material layer of the positive electrode sheet; the polyalkenyl carbonate in the solid electrolyte membrane layer will also decompose, and after its decomposition, the inorganic particles present in the solid electrolyte membrane layer will fill Into the pores formed by the positive electrode material layer, thereby forming a dense interlaced, squeezed and infiltrated positive electrode material layer and the interface of the solid electrolyte membrane layer.
[0033] In the second aspect, both the solid electrolyte film layer and the negative electrode sheet contain polyalkenyl carbonate. In th...
Embodiment approach
[0038] According to one embodiment of the preparation method of the present invention, the positive electrode sheet is obtained by coating the positive electrode slurry on the positive electrode current collector and removing the solvent; wherein,
[0039] The positive electrode slurry includes a positive electrode material and a solvent, and the positive electrode material includes 1-5% of polyalkenyl carbonate in mass percentage accounting for the total mass of the positive electrode material.
[0040] According to the preparation method of the present invention, wherein the positive electrode slurry contains polyalkylene carbonate, on the one hand, it is a polymer and has the properties of a binder, so when the positive electrode slurry is coated on the positive electrode current collector, it can be used The slurry firmly adheres to the surface of the current collector, thus contributing to the realization of the self-sustaining pressure of the all-solid-state battery to a ...
Embodiment 1
[0078] (1) Preparation of positive electrode sheet
[0079] The positive electrode sheet is obtained by coating the positive electrode slurry on the positive electrode current collector and drying the solvent; wherein the positive electrode slurry includes the positive electrode material and the solvent, and the positive electrode material includes 3% of the total mass of the positive electrode material. Propylene carbonate (molecular weight 357000). Wherein, the positive electrode material includes positive electrode active material, solid electrolyte, polypropylene carbonate, and acetylene black, and the mass ratio of the four is 80:15:3:2. The positive electrode active material is LiNbO 3 Coated LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , The solvent is anisole. The prepared slurry was scraped-coated on the aluminum foil of the positive electrode current collector with a thickness of 200 μm, and dried in a vacuum oven at a temperature of 60° C. for 1 hour to obtain a positive electr...
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