Low voltage, high capacity self-supporting potassium ion battery negative electrode and its preparation and application

Abstract

The invention discloses a low-voltage, high-capacity self-supporting potassium ion battery negative electrode material and its preparation and application. The preparation method comprises the following steps: first strong acid: second strong acid = 0.2-3:1 to prepare a mixed strong acid in terms of volume, adding carbon materials to the mixed strong acid and reacting at 50-90° C. for 1-72 hours, and then Washing and drying to obtain the treated carbon material; finally annealing the treated carbon material at 300-1000° C. for 0.5-5 hours. The present invention performs simple acidification treatment on common commercial carbon materials, and introduces oxygen-containing functional groups on the surface, thereby reducing the reaction energy barrier and facilitating the insertion and extraction of potassium ions on the surface of carbon materials, thus improving the specific capacity and rate characteristics, and making the carbon materials themselves The characteristics of the low-voltage platform are fully reflected, which is conducive to improving the voltage window of the device, which is of great significance for the design of potassium-ion batteries with high energy density.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for potassium ion batteries, and in particular relates to a low voltage, high capacity self-supporting negative electrode for potassium ion batteries and its preparation and application. Background technique [0002] With the increasing popularity of high-tech products such as electric vehicles and smartphones, large-scale energy storage technology and portable electronics are booming. However, what follows is that the energy storage part of the above products - the lithium-ion battery is facing tremendous pressure: first, the large-scale production and application of lithium-ion batteries have made the already insufficient lithium resources stretched; It is more expensive than other metal elements, which increases production costs; finally, the price of lithium resources fluctuates greatly, which is not conducive to stabilizing industrial production. Therefore, it is very ur...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the potassium storage characteristics of existing carbon materials. For example, when most carbon materials are used for potassium storage, the charging platform is relatively high, which makes the energy density of the device after matching into a full battery low.

In addition, the loading capacity of most of the existing anode materials for potassium-ion batteries is based on the loading capacity commonly used in the laboratory (-2 ), it is difficult to meet industrial standards for battery production

Finally, the conventional laboratory method for studying the anode materials of potassium ion batteries is to mix carbon materials, conductive agents, and binders in a ratio of 8:1:1 to form a slurry, coat it on the current collector, and then dry it. , these cumbersome methods will lead to the generation of pollutants and waste of resources caused by this method, as well as the decrease of the energy density of the electrode itself

At present, there are no relevant research and reports on low-voltage, high-capacity self-supporting potassium-ion battery anodes

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