Preparation method of integrally formed solid-state battery

Abstract

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to a preparation method of an integrally formed solid-state battery. The method comprises thefollowing steps: respectively dissolving a modified or unmodified electrode active substance, a conductive agent, a binder, a polymer, a lithium salt and an inorganic electrolyte in an organic solventto obtain electrode slurry; coating a current collector with the electrode slurry, drying, and rolling to obtain an electrode plate; mixing a lithium salt, a polymer, an inorganic filler, a polymericmonomer and an initiator in proportion, and dissolving the mixture in an organic solvent to form electrolyte precursor slurry; coating the electrolyte precursor slurry on the surface of the electrodeplate, and carrying out thermal initiation or photo initiation or heating drying to prepare an electrode and electrolyte integrated structure; and obtaining the solid-state battery cell in a hot pressing manner. According to the invention, the problems of poor physical contact between key material layers and large interface impedance caused by separated multi-layer stacking preparation are effectively avoided.

Description

Technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolytes, and specifically relates to a method for preparing an integrated solid-state battery. Background technique [0002] Solid-state batteries use solid electrolytes to replace the electrolytes and separators in traditional lithium-ion batteries, eliminating safety problems such as leakage, flammability and explosion caused by organic liquids. At the same time, they have better compatibility with high-specific energy electrodes, and are expected to fundamentally solve the problem. The existing secondary battery system has safety and energy density bottleneck issues. At the same time, solid-state batteries have more stable performance under extreme conditions (over-temperature, vibration, pressure, etc.), broadening their application scope and becoming a potential replacement for lithium-ion batteries. product. [0003] However, solid-state batteries also face some problems th...

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Problems solved by technology

[0003] However, solid-state batteries also face some urgent problems, which limit their large-scale application.

The most important thing is that the capacity of large-capacity solid-state batteries is severely attenuated during the cycle, and the long-term cycle stability is poor; for the application of fast-charge solid-state batteries, the power density needs to be improved; dendrite growth causes safety problems such as short circuits and thermal runaway, which are related to Solid-state electrolytes, electrode ion transport kinetics, solid / solid interface physical and chemical contact issues are closely related

[0004] Most of the existing solid-state batteries are based on the traditional lithium-ion battery preparation technology. The pre-prepared key material layers are wound or stacked, and the interface physical contact is difficult to be guaranteed, which exacerbates the problems of large interface impedance and poor interface compatibility, which seriously affects The performance of the battery is not good, and the preparation process is complicated, and the product consistency is poor

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