Potassium ion battery negative electrode active material, potassium ion battery negative electrode material, potassium ion battery negative electrode, potassium ion battery and application thereof

Abstract

The invention provides a potassium ion battery negative electrode active material, a potassium ion battery negative electrode material, a potassium ion battery negative electrode, a potassium ion battery and an application thereof, belonging to the technical field of potassium ion batteries. The potassium ion battery negative electrode active material provided by the invention comprises a ruthenium pentoxide composite material, wherein the ruthenium pentoxide composite material comprises a ruthenium pentoxide composite material containing a doping ions and / or a coating layer. The ruthenium pentoxide composite material has excellent potassium ion transport channels, can realize rapid insertion and de-intercalation of potassium ions, has stable crystal structure, adopts the reaction mechanism of intercalation and pseudocapacitance dual mechanism, prepares the potassium ion battery with the advantages of long cycle life, high specific capacity and low cost, can solve the problem of priceincrease caused by insufficient lithium resources, avoids the problems of expansion and pulverization of the alloy-type negative electrode of the potassium ion battery, slow dynamics of the intercalated carbon material and the like, and can be widely applied to electric tools, electronic equipment, electric vehicles or energy storage equipment.

Description

technical field [0001] The invention belongs to the technical field of potassium ion batteries, and in particular relates to a negative electrode active material of a potassium ion battery, a negative electrode material of a potassium ion battery, a negative electrode of a potassium ion battery, a potassium ion battery and applications thereof. Background technique [0002] In recent years, people's demand for electric vehicles and portable electronic devices is increasing, and limited lithium resources are being consumed faster and faster. New energy storage systems that can replace lithium-ion batteries have attracted more and more attention. Potassium resources are abundant, evenly distributed, low cost, and K / K + The standard electrode potential is -2.94V, which is the closest to the standard electrode potential of lithium ions, and has a high energy density, which can replace lithium for batteries. [0003] However, the radius of potassium ions is large, much larger th...

AI Technical Summary

Problems solved by technology

Potassium metal is very active. Although potassium flakes are used as the negative electrode, although the capacity is high, it is easy to cause safety hazards; alloy-type metal Sn and Bi negative electrodes have high specific capacity, but the radius of potassium ions is large, and the expansion coefficient of the metal during charging and discharging Larger, the electrode is easily pulverized, resulting in poor cycle performance; potassium ions can intercalate graphite and other layered carbon materials at low pressure, but K + In graphite, the kinetics are slow and the diffusion coefficient is small, resulting in poor rate capability

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