Method for preparing integrated quasi-solid zinc ion battery

Abstract

The invention relates to a method for preparing an integrated quasi-solid zinc ion battery and relates to the technical field of batteries. The method is characterized by using a hydrogel as a substrate, and embedding the positive electrode material and the negative electrode material of the zinc ion battery in the hydrogel substrate to realize the integrated structure of the battery, thereby avoiding the problems such as interfaces, compatibility and short circuits caused by the layered assembly of the positive electrode, the diaphragm and the negative electrode of a traditional battery. Themethod uses the hydrogel as the gel electrolyte of the zinc ion battery, embeds the flexible zinc negative electrode prepared by electro-deposition, and then chemically polymerizes a polymer materialin situ on the surface of the gel electrolyte as a positive electrode. The integrated quasi-solid zinc ion battery with a customized shape can effectively reduce the interface impedance inside the battery and promotes the rapid transmission of electrolyte ions inside the electrode. The most important thing is that such design can provide more positive electrode material loading area for the battery, which greatly increases the energy density of the battery. The invention is used in the field of batteries.

Description

technical field [0001] The invention relates to the field of zinc-ion batteries, in particular to a method for preparing an integrated quasi-solid-state zinc-ion battery. Background technique [0002] With the rapid development of wearable and portable electronic devices, researchers are motivated to continue to study flexible energy storage devices. Due to the shortcomings of lithium-ion batteries such as limited lithium source, flammable electrolyte, and high manufacturing cost, various new battery systems with high safety and low cost are being studied in depth to achieve the purpose of replacing lithium-ion batteries. Among them, the aqueous rechargeable zinc-ion battery, as an emerging battery system, is considered to be the most promising next-generation storage battery to replace lithium-ion batteries due to its non-toxic, non-polluting, environmental friendliness, and extremely low manufacturing cost. energy system. Since 2016, research on aqueous rechargeable Zn-i...

AI Technical Summary

Problems solved by technology

This way of assembling the battery will cause interfacial contact internal resistance between the positive electrode and the separator and the negative electrode and the separator, which will affect the electrochemical performance of the battery.

In addition, for wearable energy storage systems that require various deformations, the battery pole piece and separator are assembled in layers, and after repeated bending deformation, the pole piece is prone to move inside the battery, resulting in short circuit phenomenon of the battery.

[0003] Although zinc-ion batteries use high-capacity zinc metal as the negative electrode material, the theoretical capacity of the currently developed positive electrode materials is much lower than that of the zinc negative electrode, resulting in a low capacity of zinc-ion batteries obtained by traditional assembly methods.

Increasing the area loading of the positive electrode material can effectively improve the capacity and energy of the zinc-ion battery, but increasing the thickness of the electrode sheet by the common method of preparing the electrode sheet with paste-coating will cause the cathode material to fall off during the charge and discharge process. Insufficient electrolyte wetting greatly reduces the utilization rate of positive electrode materials

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