Biomass hard carbon negative electrode material for sodium ion battery as well as preparation method and application of biomass hard carbon negative electrode material

A technology of sodium ion battery and negative electrode material, which is applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problem that biomass hard carbon negative electrode materials are difficult to achieve large-scale application production, unable to form intercalation compounds, and cumbersome preparation process. And other issues

Active Publication Date: 2021-09-10
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Claims
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Problems solved by technology

[0002] Lithium-ion batteries have a mature industrial scale, but sodium-ion batteries are still in the initial stage of research and development, and have not yet been used in large-scale industrialization
The anode materials prepared by the same process will show completely different results when applied to lithium-ion batteries and sodium-ion batteries respectively. For example, carbon-based materials typically represented by graphite can be used as anode materials for lithium-ion batteries. It has achieved relatively good performance, but when it is applied to the negative electrode material of sodium ion battery, it cannot form a stable intercalation compound at all, so that graphite cannot be used as the negative electrode material of sodium ion battery
[0003] In the prior art, there are hard carbon negative electrode materials for sodium ion batteries prepared from biological waste (such as corn cobs, pumpkin vines, straw stalks, etc.) Sieve and calcined again to obtain a hard carbon negative electrode material suitable for sodium-ion batteries, but the preparation process is cumbersome, the preparation time is long and other shortcomings, which leads to high production costs and high difficulty in industrialization
In the prior art, wood chips are used as raw materials to cross-link wood chips with ethers, and then perform high-temperature carbonization again to obtain negative electrode materials for sodium-ion batteries. The preparation process is too cumbersome, and the first Coulombic efficiency is low (less than 85%) , low economic benefits of industrialization
In summary, the existing anode materials for sodium-ion batteries have the disadvantages of complex preparation process, high production cost, and low initial Coulombic efficiency, which makes it difficult to realize large-scale application and production of biomass hard carbon anode materials in industry

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  • Biomass hard carbon negative electrode material for sodium ion battery as well as preparation method and application of biomass hard carbon negative electrode material
  • Biomass hard carbon negative electrode material for sodium ion battery as well as preparation method and application of biomass hard carbon negative electrode material
  • Biomass hard carbon negative electrode material for sodium ion battery as well as preparation method and application of biomass hard carbon negative electrode material

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preparation example Construction

[0045] A preparation method of biomass hard carbon negative electrode material for sodium ion battery, comprising the following steps:

[0046]S1. Using one or more of wood, bamboo or camellia husk as biomass raw materials, immerse the biomass raw materials in sulfuric acid solution, stir at room temperature, remove the ash in the biomass raw materials and introduce oxygen atoms to the biomass The easily oxidized functional groups in the material raw materials are oxidized and modified to obtain a suspension;

[0047] S2, dispersing the suspension obtained in step S1 in water, filtering and drying to obtain a precursor;

[0048] S3, heating the precursor obtained in step S2 to 400-600° C. under the protection of an inert gas for pre-carbonization treatment, and ball milling after cooling to obtain pre-carbon powder;

[0049] S4. Heating the pre-carbon powder obtained in step S3 to 1100-1600° C. under the protection of an inert gas for high-temperature carbonization treatment,...

Embodiment 1

[0074] The sodium ion battery of the present embodiment uses the biomass hard carbon negative electrode material, scanning electron microscope picture is as follows figure 1 Morphology shown is irregular block. When the charge and discharge current is 30mA / g, the first discharge specific capacity reaches 397.6mAh / g, the charge specific capacity is 350.2mAh / g, and the first coulombic efficiency is 88%.

[0075] A kind of preparation method of the sodium ion battery of the present embodiment uses biomass hard carbon negative electrode material, comprises the following steps:

[0076] (1) Grinding the dried pine wood into powder, weighing 10g of pine wood powder as biomass raw material, adding it to 60mL of sulfuric acid with a molar concentration of 6mol / L, and stirring at room temperature for 6h to remove ash and introduce oxygen atoms , after the end of the reaction, a brown suspension was obtained.

[0077] (2) Ultrasonic disperse the resulting brown suspension in water for...

Embodiment 2

[0084] The biomass hard carbon negative electrode material for sodium ion batteries of this embodiment, when the charge and discharge current is 30mA / g, the first discharge specific capacity reaches 373.5mAh / g, the charge specific capacity is 310.4mAh / g, and the first coulombic efficiency is 83.1%. .

[0085] A kind of preparation method of the sodium ion battery of the present embodiment uses biomass hard carbon negative electrode material, comprises the following steps:

[0086] (1) Grinding the dried pine wood into powder, weighing 10g of pine wood powder as biomass raw material, adding it to 60mL of sulfuric acid with a molar concentration of 6mol / L, and stirring at room temperature for 6h to remove ash and introduce oxygen atoms , after the end of the reaction, a brown suspension was obtained.

[0087] (2) Ultrasonic disperse the resulting brown suspension in water for 30 minutes, filter and dry to obtain the precursor, then put it into a tube furnace with argon gas for ...

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Abstract

The invention discloses a preparation method of a biomass hard carbon negative electrode material for a sodium ion battery. The method comprises the following steps: taking one or more of wood, bamboo or camellia oleifera shells as a biomass raw material, immersing the biomass raw material in a sulfuric acid solution, and stirring at room temperature to obtain a suspension; dispersing the suspension in water, filtering and drying to obtain a precursor; heating the precursor under the protection of inert gas, carrying out pre-carbonization treatment, cooling, and carrying out ball milling to obtain pre-carbon powder; and heating the pre-carbon powder under the protection of inert gas, carrying out high-temperature carbonization treatment, and cooling to obtain the biomass hard carbon negative electrode material for the sodium-ion battery. The technical process is simple, and the prepared biomass hard carbon negative electrode material for the sodium ion battery is high in first coulombic efficiency.

Description

technical field [0001] The invention relates to the field of sodium-ion battery materials, in particular to a biomass hard carbon negative electrode material for sodium-ion batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have a mature industrial scale, but sodium-ion batteries are still in the initial research and development stage, and have not yet been used in large-scale industrialization. The anode materials prepared by the same process will show completely different results when applied to lithium-ion batteries and sodium-ion batteries respectively. For example, carbon-based materials typically represented by graphite can be used as anode materials for lithium-ion batteries. It has achieved relatively good performance, but when it is applied to the negative electrode material of sodium ion battery, it cannot form a stable intercalation compound at all, so that graphite cannot be used as the negative electro...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M10/054
CPCH01M4/587H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 张翔邓文涛黄沁媛胡进波李贤军
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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