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Potassium ion battery negative electrode active material, negative electrode material, potassium ion battery negative electrode, potassium ion battery, as well as preparation method and application thereof

A battery negative electrode and active material technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of poor rate performance, slow potassium ion transmission rate, and unstable structure of potassium ion batteries, so as to alleviate lithium resource reserves Limited, stable crystal structure, low cost effect

Active Publication Date: 2019-04-23
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the objects of the present invention is to provide a negative electrode active material for a potassium ion battery, which alleviates the problems of slow potassium ion transmission rate, unstable structure, poor rate performance and short cycle life of the current potassium ion battery negative electrode active material.

Method used

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  • Potassium ion battery negative electrode active material, negative electrode material, potassium ion battery negative electrode, potassium ion battery, as well as preparation method and application thereof
  • Potassium ion battery negative electrode active material, negative electrode material, potassium ion battery negative electrode, potassium ion battery, as well as preparation method and application thereof
  • Potassium ion battery negative electrode active material, negative electrode material, potassium ion battery negative electrode, potassium ion battery, as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0071] According to a fourth aspect of the present invention, there is provided a method for preparing the negative electrode of the above-mentioned potassium ion battery, comprising the following steps:

[0072] The above-mentioned negative electrode material of the potassium ion battery, the conductive agent, the binder and the solvent are mixed to form a slurry, which is coated on the surface of the negative electrode current collector to obtain the negative electrode of the potassium ion battery.

[0073] Solvents include, but are not limited to, water or NMP (N-methylpyrrolidone) and the like.

[0074] The negative electrode material is made into a slurry, and after coating, a negative electrode material layer is formed to obtain a negative electrode.

[0075] According to a fifth aspect of the present invention, a potassium ion battery is provided, including a positive electrode, the above negative electrode of the potassium ion battery or the negative electrode prepared...

Embodiment 1

[0092] A kind of preparation method of potassium ion battery negative electrode: with 0.8g Co 0.5 Ni 0.5 O(OH) 0.5 Powder, 0.1g Super P, and 0.1g polyvinylidene fluoride were added to an agate mortar, thoroughly ground, and then an appropriate amount of N-methylpyrrolidone was added to mix into a uniform slurry; then the slurry was evenly coated on the surface of copper foil ( That is, the negative electrode current collector) and vacuum drying, cutting the dried electrode sheet into discs with a diameter of 12 mm, and compacting to obtain the negative electrode;

[0093] Preparation of potassium ion battery: with 1M KPF 6 Soluble in ethylene carbonate (EC) and dimethyl carbonate (DMC) = 1:1 (v / v) as electrolyte, use glass fiber diaphragm, and use potassium sheet as counter electrode to assemble potassium ion battery.

Embodiment 2-13

[0095] The only difference between Examples 2-13 and Example 1 is that the negative electrode active material is different, as shown in Table 1.

[0096] Table 1

[0097]

[0098]

[0099] Note: / C means amorphous carbon composite; / CNT means carbon nanotube composite; / EG means expanded graphite composite; Example 4-10 has a carbon content of 10wt%, and Example 11-13 has a composite metal content of 10wt%.

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Abstract

The invention discloses a potassium ion battery negative electrode active material, a negative electrode material, a potassium ion battery negative electrode, a potassium ion battery, as well as a preparation method and application thereof, and relates to the technical field of potassium ion batteries. The potassium ion battery negative electrode active material comprises a bimetallic oxide or a composite material thereof, and the composition general formula of the bimetallic oxide is MI1-xMIIxO(OH)x, wherein MI represents a divalent metal; MII represents a trivalent metal; and the range of xis 0 < x < 1. According to the invention, the layered bimetallic oxide and the composite material thereof are used as negative electrode active materials. Meanwhile, the bimetal oxide has a rapid potassium ion transmission channel. According to the invention, potassium ions can be embedded and deembedded quickly and an obtained crystal structure is stable. The phase change is avoided in the embedding and removing process of potassium ions, and the reaction mechanism is realized based on the intercalation and conversion reaction. The potassium ion battery adopting the bimetallic oxide or the composite material thereof as the negative electrode active material is high in specific capacity, good in rate capability and long in cycle life.

Description

technical field [0001] The invention relates to the technical field of potassium ion batteries, in particular to a negative electrode active material of a potassium ion battery, a negative electrode material, a negative electrode of a potassium ion battery, a potassium ion battery and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have become an extremely important electrochemical energy storage device due to their high energy density, long cycle life, safety and environmental protection, and have a wide range of applications in the fields of portable electronic products, electric vehicles and large-scale energy storage. Applications. However, limited lithium resources are also being consumed faster and faster, and new energy storage devices that can replace lithium-ion batteries have attracted more and more attention. Potassium is rich in resources, evenly distributed, low in cost, and K / K + The standard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/50H01M4/48H01M4/131H01M4/1391H01M10/054
CPCH01M4/131H01M4/1391H01M4/48H01M4/50H01M4/52H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 唐永炳雷新张帆
Owner SHENZHEN INST OF ADVANCED TECH
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