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

A battery negative electrode and active material technology, applied in the direction of active material electrodes, battery electrodes, negative electrodes, etc., can solve the problems of large metal expansion coefficient, small diffusion coefficient, slow kinetics, etc., and achieve low cost, stable crystal structure, and relatively low cost. The effect of high capacity

Active Publication Date: 2019-04-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 1. Potassium ion battery negative electrode active material

[0094] A negative electrode active material for a potassium ion battery comprises a niobium pentoxide composite material; the niobium pentoxide composite material is a niobium pentoxide composite material containing a cladding layer.

[0095] Wherein, the cladding layer is a carbon material, and the mass fraction of the carbon material is 10wt%. The preparation of niobium pentoxide composite material includes: adding 8mmol niobium pentachloride and 1.47mmol citric acid into 100mL deionized water, stirring rapidly, adding 30g sodium chloride, stirring for 30min, freezing with liquid nitrogen, and then freeze-drying 24h, tube furnace at 700°C, heat preservation in argon atmosphere for 1h, after natural cooling, rinse with deionized water and absolute ethanol repeatedly to remove the template, and vacuum dry at 60°C overnight to obtain niobium pentoxide composite material Nb 2 o 5 @C.

[0096] 2. Potassium io...

Embodiment 2-16

[0102] The difference between Examples 2-16 and Example 1 is that the active material of the negative electrode material is different, as shown in Table 1.

[0103] Table 1 Active material of negative electrode material

[0104]

[0105]

[0106] In Table 1, @C means carbon coating, @TiO 2 Indicates TiO 2 Coated, Nb 2 o 5 @MnO 2 @TiO 2 Indicates that the MnO 2 coating, followed by TiO 2 clad.

Embodiment 19-21

[0108] The difference between Examples 19-21 and Example 1 is that the diaphragm is different, as shown in Table 2.

[0109] Table 2 Diaphragm

[0110]

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M10/054
CPCH01M4/366H01M4/38H01M4/485H01M10/054H01M2004/027Y02E60/10
Inventor 唐永炳李娜张帆
Owner SHENZHEN INST OF ADVANCED TECH
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