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Metal element doped alkali metal ion battery negative electrode material and preparation method thereof

A technology of alkali metal ions and metal elements, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low doping content of metal elements, inability to fix metal elements firmly, poor uniformity and stability, and achieve Low impedance, excellent reversibility, effects of ensuring uniformity and stability

Pending Publication Date: 2022-02-25
NORTH CHINA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN110921655B-Pd single-atom-doped graphene-nitrogen-doped amorphous carbon composite material and its preparation method, the document directly carbonizes the carbonized bacterial cellulose composite polydopamine to realize the doping of nitrogen element, polydopamine in the whole The system is only used as the source of nitrogen element, and then doped with metal elements. This kind of doping is only a kind of physical mixing, which cannot firmly fix the metal elements. The doping content of metal elements is low, and the uniformity and stability are poor.

Method used

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  • Metal element doped alkali metal ion battery negative electrode material and preparation method thereof
  • Metal element doped alkali metal ion battery negative electrode material and preparation method thereof
  • Metal element doped alkali metal ion battery negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] The preparation method of the alkali metal ion battery negative electrode material doped with metal elements comprises the following steps:

[0038] (1) Add bacterial cellulose (BC) flakes to Tris-HCl buffer solution, then add dopamine (DA), stir and react to obtain BC / PDA composite material

[0039] 1) Wash the bacterial cellulose membrane repeatedly with deionized water, soak it in 0.1mol / L NaOH solution, and heat it to 90°C in a constant temperature water bath for 90 minutes in a water bath to remove the bacteria and other impurities remaining in the bacterial cellulose membrane, take it out and cool it Repeatedly wash with deionized water until the bacterial cellulose is neutral, i.e. PH=7, to obtain a purified bacterial cellulose membrane, cut the purified bacterial cellulose membrane into 2cm×4cm bacterial cellulose sheets, and soak in deionized reserve in water;

[0040] 2) Add bacterial cellulose flakes to Tris-HCl buffer solution with a pH of 8.5, then add dop...

Embodiment 2

[0056] This example is basically the same as Example 1, except that in step (2), 6 pieces of BC / PDA composite materials are placed in 0.08mol / L copper nitrate solution for soaking reaction to obtain BC / PDA / Cu composite Material.

[0057] The carbonized BC / PDA / Cu composite material is prepared into a potassium ion battery, and the cycle number-capacity / efficiency test is performed, such as Figure 11 As shown, in the first charge and discharge process after being placed for 8-10 hours, the discharge specific capacity is as high as 500mAh / g, and the efficiency of the battery will increase with the increase of the cycle number, even exceeding 100%. In the battery capacity-voltage test, the fast sweep 500mA / g and the slow sweep 50mA / g can maintain 80-90% of the capacity well, indicating that the sintered carbonized BC / Cu composite material is used as the negative electrode material of the potassium ion battery Has good capacitance retention.

Embodiment 3

[0059] This example is basically the same as Example 1, except that in step (2), 6 pieces of BC / PDA composite materials are placed in 0.05mol / L ferric nitrate solution for soaking reaction to obtain BC / PDA / Fe composite Material.

[0060] Carry out XRD test to the BC / PDA / Cu composite material after carbonization, the X-ray diffraction pattern is as follows Figure 12 shown, from Figure 12 It can be seen that the crystallization peak of elemental Fe appears at the position of 44.66°, and the crystallization peak of ferric oxide (Fe 3 o 4 ) crystallization peak. It shows that in the carbonized BC / PDA / Cu composite material, Fe is composed of iron and Fe 3 o 4 Existing in the same way, the characteristic crystallization peak of BC becomes weaker, which may be the reduced elemental iron and Fe 3 o 4 Attaches to the surface of composite fibers.

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Abstract

The invention discloses a metal element doped alkali metal ion battery negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: adding bacterial cellulose sheets into a Tris-HCl buffer solution, and then adding dopamine for reaction to obtain a bacterial cellulose / polydopamine composite material; placing the bacterial cellulose / polydopamine composite material in a metal salt solution for soaking reaction to obtain a bacterial cellulose / polydopamine / metal element composite material; and sintering and carbonizing the bacterial cellulose / polydopamine / metal element composite material to obtain the carbonized bacterial cellulose / polydopamine / metal element composite material. The BC / PDA / metal element composite material is prepared by utilizing stable hydrogen bonds formed by polydopamine and rich hydroxyl groups on bacterial cellulose and the reducibility of polydopamine, and the carbonized BC / PDA / metal element composite material has the potential of serving as a high-efficiency and high-capacity energy storage material as a negative electrode material.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for energy storage batteries, in particular to a metal element-doped alkali metal ion battery negative electrode material and a preparation method thereof. Background technique [0002] Rechargeable batteries are an ideal way to store energy such as non-polluting use, variety of shapes and sizes, enormous capacity and long cycle life. The representative of rechargeable secondary energy technology that is common in our life now is lithium-ion battery. The development of lithium-ion batteries has expanded to all aspects of our lives, whether it is mobile phones, computers, charging treasures, or automobiles, airplanes, ships, rockets, lithium-ion batteries can be seen. Lithium-ion batteries may continue to be used in electronic devices and electric vehicles in the future, which will intensify the consumption of lithium reserves in the earth's crust. Therefore, it is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M10/054
CPCH01M4/362H01M4/38H01M4/606H01M4/602H01M10/054H01M2004/027Y02E60/10
Inventor 岳丽娜杨天芮唐利刚高明刘志伟
Owner NORTH CHINA INST OF SCI & TECH
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