Carbon nanotube cathode material-for potassium ion secondary battery

Abstract

The invention relates to a negative electrode material for a potassium ion secondary battery, wherein the active material of the negative electrode material is carbon nanotubes. The carbon nanotube negative electrode is completely composed of an active material carbon nanotube without a conductive agent and a binder, and the preparation process of the electrode is simple and easy. The carbon nanotube anode material can be directly applied to the anode of the potassium ion secondary battery. The button-type battery assembled by the carbon nanotube negative electrode material and the electrolytesystem of the invention has excellent electrochemical properties such as high safety, long cycle life, good rate performance, high charge-discharge coulomb efficiency and the like. The above resultsshow that the potassium ion batteries based on carbon nanotube cathode materials are expected to be widely used in the large-scale power storage field which needs electrochemical energy-driven equipment and low-cost smart grid.

Description

technical field [0001] The invention belongs to the technical field of rechargeable battery materials, and in particular relates to a carbon nanotube negative electrode material suitable for potassium ion secondary batteries and its application. Background technique [0002] Potassium is abundant in nature (the abundance of potassium in the earth's crust is ~2.47%, and the content in seawater is ~0.38g / kg), low cost and negative redox potential (K / K + , -2.936V relative to the standard hydrogen electrode potential) and other advantages, potassium ion secondary battery technology is considered to be a promising large-scale electrochemical energy storage technology in the future. Therefore, the development of inexpensive potassium-ion batteries with excellent cycling performance is of great commercial value. [0003] Like lithium / sodium-ion batteries, the negative electrode preparation process of conventional potassium-ion batteries generally goes through the following steps:...

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Problems solved by technology

From another perspective, it is not difficult to understand that the weight ratio of these two inactive substances also determines the proportion of active substances in the entire electrode, which ultimately affects the performance of the entire electrode.

In addition, for the electrode materials prepared by the coating method, the conductive current collectors are mostly rigid structural materials such as copper foil or aluminum foil. If the electrode materials are bent or folded or processed, the active material will fall off from the surface of the current collector and the collector will also be lost. The mechanical properties of the fluid, so this also greatly limits its application in the field of flexible devices

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