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3041 results about "Thermal shrinkage" patented technology

Inorganic/organic composite membrane, preparation method of inorganic/organic composite membrane and lithium ion secondary battery containing membrane

The invention discloses an inorganic/organic composite membrane which comprises a porous substrate and a porous insulating layer, wherein the porous insulating layer is attached to the porous substrate, and at least one surface of the porous substrate is coated with the porous insulating layer; the porous insulating layer comprises inorganic particles and a binding agent, wherein the inorganic particles are composed of n particles with different average particle diameters, n is large than or equal to 2, and the average particle diameters from the first type of inorganic particles to the nth type of inorganic particles are changed in a gradient manner. The invention further discloses a preparation method of the inorganic/organic composite membrane. The preparation method comprises the following steps: firstly, dissolving the binding agent into a solvent to form a polymer solution, then adding the inorganic particles, mixing to prepare the porous insulating layer, and then coating at least one surface of the porous substrate with the porous insulating layer. The invention further discloses a lithium ion secondary battery containing the membrane. The inorganic/organic composite membrane disclosed by the invention has the advantages of high stacking density, low thermal shrinkage rate, high puncture strength, simple preparation process and proper cost, and the lithium ion secondary battery containing the membrane has the advantages of good conservation rate of circulating volume and excellent safety performance and electrochemical performance.
Owner:东莞市魔方新能源科技有限公司

Composite membrane for lithium ion secondary battery, manufacturing method of composite membrane and electrochemical device containing membrane

The invention discloses a composite membrane for a lithium ion secondary battery. The composite membrane comprises a porous membrane and a plurality of porous insulating layers, wherein at least one surface of the porous membrane is covered by the porous insulating layers, the hole diameters of the porous insulating layers are distributed from small to large in a gradient manner from the porous membrane to the direction of a pole piece, and the porous insulating layers contain inorganic particles and binding agents. The invention further discloses a preparation method of the composite membrane. The preparation method comprises the following steps: firstly, mixing and dispersing the inorganic particles, the binding agents and a hole forming agent in a solvent to obtain slurry, coating the surface of the porous membrane with the slurry, and drying to obtain the composite membrane. The invention further discloses an electrochemical device containing the composite membrane. According to the composite membrane, the preparation method of the composite membrane and the electrochemical device which are disclosed by the invention, the composite membrane has the advantages of good thermostability, low thermal shrinkage, excellent safety performance and good electrochemical performance, the preparation method of the composite membrane has the advantages of simplicity in operation and convenience, and the electrochemical device has excellent safety performance and good electrochemical performance.
Owner:东莞市魔方新能源科技有限公司
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