Flexible cell based on metallic oxide/graphene composite macroscopic fibers and preparation method

Abstract

The invention relates to a flexible cell based on metallic oxide / graphene composite macroscopic fibers and a preparation method. The preparation method comprises the following steps: after mixing an anionic metal oxide aqueous solution with graphene oxide to obtain a spinning solution, adding the spinning solution in wet spinning equipment to obtain nascent fibers; repeatedly washing the obtained nascent fibers with deionized water, and drying the nascent fibers to obtain metallic oxide and graphene oxide composite fibers; reducing the metallic oxide and graphene oxide composite fibers with hydroiodic acid, and then washing and drying the metallic oxide and graphene oxide composite fibers to obtain the metallic oxide and graphene composite fibers; placing the composite fibers, lithium lines and lithium manganate loaded carbon cloth fibers in a shrinkable tube in parallel; and adding diaphragms and electrolyte so that half cells and total cells can be assembled respectively. The preparation process is simple and controllable, and large-scale production is facilitated. The metallic oxide and graphene composite fibers which are prepared by the preparation method for the first time have unlimited prospects in the field of energy storage of flexible cells.

Description

technical field [0001] The invention relates to a fiber used in flexible battery technology, in particular to a flexible battery based on metal oxide / graphene composite macroscopic fibers and a preparation method. Background technique [0002] With the growing market of portable and wearable electronic devices in recent years, wearable devices including Google glasses and Apple Watches have attracted widespread attention. Flexible batteries have become an important part of the development of wearable devices because they do not have high energy density and long cycle life. Compared with traditional batteries, the advantages of flexible batteries are that they are lighter, highly flexible, and can even be woven into fabrics. [0003] The development of fibrous flexible batteries is currently a promising approach. However, most of the current research is to load the active materials on flexible substrates such as metal wires and carbon fibers through post-processing, but ther...

AI Technical Summary

Problems solved by technology

However, most of the current research is to load the active materials on flexible substrates such as metal wires and carbon fibers through post-processing, but there are two practical problems: (1) The mass of active materials loaded on the substrate is too small, resulting in the preparation of fiber batteries. Satisfying large-capacity storage, the current specific capacity of flexible batteries is mostly given per gram of active material, which is not suitable for characterizing the actual application performance of the battery. The specific capacity that truly reflects the actual application performance of the battery should be in units of centimeters; (2 ) The contact between the active material and the substrate is poor, and it is easy to fall off when it is bent and stressed, resulting in a decrease in storage capacity, which is also not conducive to the application of flexible devices

[0004] At the same time, the metal fibers disclosed in the prior art cannot be used as flexible battery electrode materials due to almost no electrochemical performance; therefore, it is necessary to develop new electrode materials for flexible batteries

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