Preparation method of rubidium doped polymer solid electrolyte membrane

Abstract

The invention relates to a preparation method of a rubidium doped polymer solid electrolyte membrane, which is characterized in that a rubidium compound and polymer solid electrolyte solution are uniformly mixed and applied to the surface of a polyolefin membrane by dip-coating. The rubidium ions in the polymer solid electrolyte membrane have a larger particle radius than lithium ions, and a large-aperture ion channel is formed in the polymer solid electrolyte membrane. Lithium ions can be quickly de-intercalated. The conductivity and cycle performance of the polymer solid electrolyte membraneare improved. In addition, the matrix polyolefin membrane can provide good mechanical strength for the polymer solid electrolyte membrane, and is more practical.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a rubidium-doped polymer solid-state electrolyte membrane. Background technique [0002] Compared with traditional lithium batteries, the most prominent advantage of solid-state electrolyte batteries is safety. The liquid electrolyte is flammable and explosive, and the growth of lithium dendrites during the charging process can easily pierce the separator, causing a short circuit in the battery and causing a safety hazard. The solid-state electrolyte is non-flammable, non-corrosive, non-volatile, and there is no leakage problem, so all-solid-state batteries have extremely high safety. Polymer solid electrolytes are more popular than inorganic solid electrolytes due to their better compatibility with electrodes and lower interfacial impedance. However, due to the low conductivity and poor mechanical properties of polymer solid electrolytes,...

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Problems solved by technology

The above methods have improved the electrical conductivity to a certain extent, but have not improved the mechanical properties, and the preparation process is complicated, which has high requirements for the manufacturing process.

CN108336398A discloses an organic-inorganic composite solid electrolyte, wherein the inorganic solid electrolyte provides a certain mechanical strength, but the inorganic solid electrolyte is difficult to disperse in the polymer, and it is easy to agglomerate and block the ion channel, resulting in low conductivity

None of the above methods can take into account the electrical conductivity and mechanical strength at the same time. Therefore, we provide a method for preparing a high-conductivity polymer solid electrolyte membrane with a simple preparation process, which improves the mechanical strength while increasing the electrical conductivity.

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