Solid composite electrolyte membrane, manufacturing method thereof and polymer secondary battery

Abstract

The invention provides a solid composite electrolyte membrane, which is composed of a solid polymer electrolyte layer (1) serving as a main body and gel polymer electrolyte layers (2, 3) arranged on the surfaces of the two sides of the solid polymer electrolyte layer (1) respectively, wherein the solid polymer electrolyte layer (1) and the gel polymer electrolyte layers (2, 3) are prepared from apolymer electrolyte composition containing a polymer, a plastic crystal and an electrolyte salt, and the concentration of the electrolyte salt in the solid polymer electrolyte layer (1) is lower thanthe concentration of the electrolyte salt in the gel polymer electrolyte layers (2, 3). According to the solid-state composite electrolyte membrane, the conductivity of a polymer-electrolyte salt system can be improved by several orders of magnitudes, a battery containing the solid-state composite electrolyte membrane can normally operate at room temperature, the contact between a polymer electrolyte and an electrode can be effectively enhanced, and the interface impedance is reduced.

Description

technical field [0001] The invention relates to a solid polymer electrolyte, in particular to a solid composite electrolyte membrane, a manufacturing method thereof, and a polymer secondary battery containing the solid composite electrolyte membrane. Background technique [0002] Compared with other secondary batteries, lithium-ion secondary batteries have outstanding advantages such as high energy density, long cycle life, no memory effect, and low environmental pollution. They are now used in computers, electronic products, mobile communication equipment, and electric vehicles. field has been widely used. However, with the expansion of application fields, higher requirements are put forward for the energy density and power of lithium-ion secondary batteries, which makes the safety of batteries more and more prominent. [0003] The main reason for the safety problem of lithium-ion secondary batteries is that the electrolyte of commercial lithium-ion secondary batteries con...

AI Technical Summary

Problems solved by technology

[0006] However, in the above several methods, the first method reduces the interfacial impedance as a whole by adding ionic liquids, but such additives may not be compatible with the main body of the solid polymer electrolyte; Although the introduction of flexible groups can improve the interface to a certain extent, it cannot guarantee the bulk conductivity of the solid polymer electrolyte; the third method is complicated to implement and has low productivity

Images