A method for preparing a solid composite electrolyte membrane supported by a synchronous substrate

A technology of composite electrolyte membrane and solid electrolyte, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc. It can solve the problems of uncontrollable electrolyte penetration effect, great difference in film forming mechanical properties, and damage to the safety performance of solid-state batteries. Achieve the effect of improving lithium guiding ability, good processing performance, uniform and controllable thickness

CN112886067BActive Publication Date: 2022-04-26SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-04-26

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Abstract

The invention relates to the field of solid electrolyte membranes, in particular to a method for preparing a synchronous substrate-supported solid composite electrolyte membrane, comprising the following steps: a. Extruding ultra-high molecular weight or high-density polyolefin molten state slurry to form a cast film; b. The solid electrolyte molten slurry is evenly extruded on the surface of the cast sheet film at a temperature T1 to form a solid electrolyte coating to obtain a solid electrolyte coating-cast sheet substrate; c. solid electrolyte coating-cast sheet substrate at temperature Stretching is carried out in T2 to obtain a film; d. The stretched film is subjected to hot-pressing and setting to control thickness, and cooled to obtain a solid composite electrolyte membrane. By controlling the tensile parameters, the impregnation effect of the solid electrolyte on the porous carrier can be adjusted to form a continuous lithium-conducting channel, improve the lithium-conducting ability of the composite electrolyte, and avoid the subsequent separate impregnation steps, which can effectively improve the production efficiency of the composite electrolyte membrane.
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Description

technical field

[0001] The invention relates to the field of solid electrolyte membranes, in particular to a method for preparing a solid composite electrolyte membrane supported by a synchronous substrate. Background technique

[0002] Lithium-ion batteries have attracted increasing attention due to their advantages such as high voltage, high specific energy, long cycle life, no memory effect, good safety performance and less environmental pollution. In recent years, they have been used in portable electronic devices, electric vehicles, energy storage and other applications The field ushered in explosive development. At present, lithium-ion batteries are continuing to progress towards high specific energy and high safety. The application of high-capacity electrode materials has brought about an increase in energy density, but the liquid electrolyte system is still the main factor restricting its safety performance. All-solid-state electrolytes are recognized as an effectiv...

Examples

preparation example Construction

[0018] A preparation method of a solid composite electrolyte membrane supported by a synchronous substrate, comprising the following steps:

[0019] a. Ultra-high molecular weight or high-density polyolefin melt slurry is extruded to form a cast film;

[0020] b. Uniformly extruding the molten solid electrolyte slurry on the surface of the cast film at a temperature T1 to form a solid electrolyte coating to obtain a solid electrolyte coating-cast substrate;

[0021] c. Stretching the solid electrolyte coating-cast sheet substrate at a temperature T2 to obtain a film;

[0022] d. The stretched film is hot-pressed to control its thickness, and then cooled to obtain a solid composite electrolyte membrane.

[0023] The present invention is to extrude and coat the molten solid electrolyte slurry on the polyolefin cast sheet to form a solid electrolyte coating-cast sheet substrate, which is then stretched, hot-pressed, and cooled in a heated state. figure 1 , to obtain a solid com...

Embodiment 1

[0056] The stretching method in this embodiment is stretching-impregnation simultaneous double-stretching, that is, as mentioned above, the process of stretching and reaming of the base material and infiltration and filling of the solid electrolyte material are not independent steps, but are carried out synchronously. The solid-state composite electrolyte membrane is based on the ratio of parts by mass, using 50 parts of polyethylene with a weight average molecular weight of 1.4 million to 1.6 million, 70 parts of polymer electrolyte, 30 parts of inorganic filler, and 5 parts of polymer interface modifier. 15 parts of lithium salt are obtained by melt mixing extrusion, stretching, and hot pressing; among them, the polymer electrolyte has a weight average molecular weight of 400,000, and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) / weight average molecular weight 50,000 polypropylene carbonate (PPC) = 2:1; the inorganic filler is lithium lanthanum zirconium oxide parti...

Embodiment 2

[0058] The stretching method in this embodiment is stretching-dipping synchronous double stretching. The components and proportions of polyolefin substrate and solid electrolyte are the same as in Example 1. The stretching temperature of the simultaneous double stretching was 125° C., the transverse and longitudinal stretch ratio was 1.5, the longitudinal stretch ratio was 8 times, and the transverse stretch ratio was 12 times. The stretching rate was 100 m / min.