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Palygorskite-like material, negative electrode active material and method for preparing same, electrochemical cell negative electrode material, and electrochemical cell

A negative electrode active material and battery negative electrode technology, applied in the direction of battery electrodes, electrochemical generators, secondary batteries, etc., can solve the problems that it is difficult to take into account the reduction of battery manufacturing costs and the complexity of magnesia thermal reduction reaction, and achieve the effect of reducing manufacturing costs

Inactive Publication Date: 2019-11-26
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Palygorskite-like material, negative electrode active material and method for preparing same, electrochemical cell negative electrode material, and electrochemical cell
  • Palygorskite-like material, negative electrode active material and method for preparing same, electrochemical cell negative electrode material, and electrochemical cell
  • Palygorskite-like material, negative electrode active material and method for preparing same, electrochemical cell negative electrode material, and electrochemical cell

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preparation example Construction

[0046] The embodiment of the present invention also provides a preparation method of negative electrode active material, comprising:

[0047] S1, providing purified palygorskite; and

[0048] S2, heating the palygorskite to remove at least part of the H 2 O forms the water present in the palygorskite, but maintains the layered structure of the palygorskite, resulting in a palygorskite-like structure.

[0049] Palygorskite minerals that exist in nature are often accompanied by montmorillonite, mica, quartz, sepiolite and a small amount of carbonate impurities. In step S1, the purified palygorskite is obtained by purifying palygorskite 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, ...

Embodiment 1

[0069] The palygorskite mineral is purified by natural drying-crushing-airflow drying-grinding-wind classification to obtain high-grade palygorskite powder. The thermogravimetric curve of the palygorskite powder from room temperature to 800 °C is as follows: image 3 shown.

[0070] The palygorskite powder was heat-treated under vacuum at 200 °C for 2 hours (the heating rate was 5 °C min -1 ), to obtain a palygorskite-like structure negative electrode active material powder. Depend on image 3 According to thermogravimetric analysis, the chemical formula of the material heated at 200°C is (Mg, Al, Fe) 5 [Si 4 o 10 ] 2 (HO) 2 (OH 2 ) 0.8 .

Embodiment 2

[0072] The purification of palygorskite mineral is the same as in Example 1.

[0073] The palygorskite powder was heat treated under vacuum at 500 °C for 10 hours (the heating rate was 10 °C min -1 ), obtain the negative electrode active material powder of palygorskite structure, analyze the chemical formula that obtains material with the same method as embodiment 1 is (Al, Mg, Fe) 5 [Si 4 o 10 ] 2 (OH) 2-x (x≈1.46, x is a vacancy).

[0074] The method and conditions of using the negative electrode active material powder to prepare the negative electrode and assembling the battery are the same as those in Example 1.

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Abstract

The present invention provides a negative electrode active material having a palygorskite-like structure in which the molar ratio of water existing in the form of H2O to [Si4O10]4- is less than 4. Thepresent invention also provides an electrochemical cell negative electrode material, including the negative electrode active material, a conductive agent, and a binder. The invention also provides anelectrochemical cell including a positive electrode, a negative electrode, and an electrolyte, wherein the negative electrode includes the electrochemical cell negative electrode material. The invention also provides a method for preparing the negative electrode active material, including providing purified palygorskite and heating the palygorskite in order to remove at least part of the water present in the palygorskite in the form of H2O but maintain the layered structure of palygorskite to obtain the palygorskite-like structure. The invention also provides a palygorskite-like material.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a palygorskite-like material based on layered silicate, a 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/054
CPCH01M4/5825H01M10/0525H01M10/054Y02E60/10
Inventor 唐子龙张俊英王诗童赵黎江张中太
Owner TSINGHUA UNIV