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Negative electrode active material and preparation method thereof, electrochemical battery negative electrode material and electrochemical battery

A negative electrode active material, electrochemical technology, applied in battery electrodes, electrochemical generators, inorganic chemistry and other directions, can solve the problems of difficulty in taking into account the reduction of battery manufacturing costs and the complexity of magnesium thermal reduction reaction, and achieve the effect of reducing manufacturing costs.

Active Publication Date: 2022-05-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, porous silicon dioxide is prepared into porous silicon through magnesia thermal reduction, and the pores are used as a buffer to suppress the volume change during charging and discharging. However, the magnesia thermal reduction reaction is complicated, and it is difficult to meet the needs of reducing battery manufacturing costs.

Method used

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  • Negative electrode active material and preparation method thereof, electrochemical battery negative electrode material and electrochemical battery
  • Negative electrode active material and preparation method thereof, electrochemical battery negative electrode material and electrochemical battery
  • Negative electrode active material and preparation method thereof, electrochemical battery negative electrode material and electrochemical battery

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preparation example Construction

[0037] The embodiment of the present invention also provides a preparation method of negative electrode active material, comprising:

[0038] S1, providing purified illite; and

[0039] S2, heating the illite to remove the adsorbed water in the illite while maintaining the layered crystal structure of the illite to obtain the negative electrode active material.

[0040] Illite minerals existing in nature are often accompanied by montmorillonite, muscovite and a small amount of carbonate impurities. In step S1, the purified illite is obtained from illite minerals. The purification method is preferably a mechanical method, a physical-chemical method, a chemical method or an electrical method. Specifically, the purification method can be selected according to the physical properties of different types of minerals in the raw material, such as the particle size and shape of the minerals, density, rolling friction and sliding friction angle, wettability, electromagnetic properties,...

Embodiment 1

[0061] Illite minerals are purified by natural drying-crushing-airflow drying-grinding-wind classification to obtain high-grade illite powder. Firstly, the illite powder is subjected to thermogravimetric test, and the thermogravimetric curve from room temperature to 1300°C is as follows: image 3 shown.

[0062] Another illite powder was heat-treated under vacuum at 200°C for 2 hours (the heating rate was 5°C·min -1 ), to obtain illite-like structure negative electrode active material powder. Depend on image 3 The chemical formula of the material heated at 200°C obtained by thermogravimetric analysis is K 0.75 (Al 1.75 Fe 0.25 )[Si 3.5 Al 0.5 o 10 ](OH) 2 .

Embodiment 2

[0064] The purification of illite mineral is the same as in Example 1.

[0065] The illite powder was heat-treated under vacuum at 600°C for 10 hours (the heating rate was 10°C·min -1 ), obtain the negative electrode active material powder of class illite structure, analyze the chemical formula that obtains material with the same method as embodiment 1 is K 0.75 (Al 1.75 Fe 0.25 )[Si 3.5 Al 0.5 o 10 ](OH) 0.88 .

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Abstract

The invention provides a negative electrode active material, which is obtained by heating illite to remove adsorbed water in the illite, and the negative electrode active material has a layered crystal structure. The present invention also provides an electrochemical cell negative electrode material, which includes the negative electrode active material, a conductive agent and a binding agent. The present invention also provides an electrochemical cell, including a positive electrode, a negative electrode and an electrolyte, and the negative electrode includes the negative electrode material of the electrochemical cell. The present invention also provides a method for preparing a negative electrode active material, comprising providing purified illite; and heating the illite to remove the adsorbed water in the illite, but maintaining the layered crystal structure of the illite, The negative electrode active material was obtained.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a layered silicate-based negative electrode active material and a preparation method thereof, an electrochemical battery negative electrode material and an electrochemical battery. Background technique [0002] Today, people's demand for pure electric vehicles and consumer electronics is increasing day by day. The new generation of electrochemical batteries represented by lithium-ion batteries has high energy density, high power density, and Long cycle life is getting more and more attention. In lithium-ion batteries, the negative electrode active material is a substance that undergoes a reversible electrochemical reaction with lithium ions and provides a reversible lithium-deintercalation capacity. [0003] At present, the widely used negative electrode active material is graphite material, and its theoretical capacity is 372mAh g -1 , which has the advantages of good cycle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/00
CPCC01G49/009H01M4/5825H01M10/0525C01P2002/72C01P2006/40Y02E60/10
Inventor 唐子龙张俊英王诗童赵黎江张中太
Owner TSINGHUA UNIV