Nanocarbon material composite biomass hard carbon electrode material and preparation method and application thereof

A technology of electrode materials and nano-carbon materials, applied in the field of electrochemical energy storage, can solve the problems of large irreversible capacity of biomass hard carbon, reduction of material active sites, low discharge voltage, etc., and achieve fast electron migration, storage or adsorption The effect of large amount of ions or electrons and high specific capacity

Active Publication Date: 2021-06-29
昆山昆鹏利杰高分子材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of pyrolysis to prepare biomass carbon materials, carbon atoms are prone to agglomeration, and the active sites of the material are reduced.
At present, biomass hard carbon has disadvantages such as large irreversible capacity, low initial efficiency and low discharge voltage, which greatly limit its application in energy storage.

Method used

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  • Nanocarbon material composite biomass hard carbon electrode material and preparation method and application thereof

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preparation example Construction

[0024] The preparation method of a kind of nano-carbon material composite biomass hard carbon electrode material of the present invention, comprises the following steps:

[0025] a. Clean the biomass raw materials such as coconut shells, straws, bamboo stalks, and tobacco stalks, and dry them at 60-120°C. After drying, perform preliminary crushing to obtain 16-60 mesh particles A;

[0026] b. Put particle A into potassium hydroxide, sodium hydroxide or ammonia solution with a concentration of 1-5mol / L, heat and stir at 90-120°C for 1-12h, then rinse with deionized water, filter or centrifuge Until the mixed liquid is neutral, then carry out solid-liquid separation, dry the solid matter at 60-120°C after separation, and perform the second crushing to obtain 100-400 mesh powder B;

[0027] c. Put powder B into hydrochloric acid or nitric acid solution with a concentration of 1-5mol / L, heat and stir at 90-120°C for 1-12h, then rinse with deionized water, filter or centrifuge unti...

Embodiment 1

[0037] This embodiment provides a nano-carbon material composite biomass hard carbon electrode material, the preparation method is as follows:

[0038] a, clean the coconut shell, and after vacuum drying at 60°C, crush with a crusher to obtain 30 mesh particles A;

[0039] b. Put particle A into an aqueous solution of potassium hydroxide with a concentration of 1 mol / L, heat and stir at 100°C for 6 hours, then repeatedly wash and centrifuge with deionized water until the mixed solution is neutral, and then perform solid-liquid separation. Vacuum-dry the solid matter at 60°C, and crush it for the second time with a crusher to obtain 100 mesh powder B;

[0040] c. Put the powder B into the nitric acid solution with a concentration of 1mol / L, heat and stir at 100°C for 6h, then repeatedly wash and centrifuge with deionized water until the mixed solution is neutral, and then separate the solid and liquid at 60°C Dry the solid substance under vacuum to obtain powder C;

[0041] D...

Embodiment 2

[0047] This embodiment provides a nano-carbon material composite biomass hard carbon electrode material, the preparation method is as follows:

[0048] a. Clean the stalks, dry them with a blast at 100°C, and then use a crusher to perform preliminary crushing to obtain 50-mesh particulate matter A;

[0049] b. Put particle A into an aqueous sodium hydroxide solution with a concentration of 2 mol / L, heat and mechanically stir at 90°C for 2 hours, then repeatedly rinse with deionized water and filter with suction until the mixed solution is neutral, and then perform solid-liquid separation. Blast-dried solid matter at 100°C, and crushed for the second time with a crusher to obtain 150-mesh powder B;

[0050] c. Put the powder B into the hydrochloric acid solution with a concentration of 2mol / L, heat and mechanically stir at 90°C for 2 hours, then repeatedly rinse with deionized water and filter with suction until the mixed solution is neutral, and then perform solid-liquid separ...

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Abstract

The invention discloses a preparation method of a nanocarbon material composite biomass hard carbon electrode material. The preparation method comprises the following steps: with biomass as a raw material, primarily crushing, cleaning and drying the biomass; performing heating treatment with an alkali solution, performing secondary crushing after cleaning and drying, performing heating treatment with an acid solution, removing redundant inorganic salt impurity components, and performing cleaning and drying; adding a uniformly dispersed acid solution of graphene oxide and carbon nanotubes, conducting uniform stirring and mixing, performing treating by using a microwave hydrothermal method, carrying out drying, and performing crushing for the third time to obtain a composite biomass hard carbon precursor; and carrying out low-temperature pre-carbonization and high-temperature treatment on the composite biomass hard carbon precursor under the protection of an inert atmosphere to obtain the composite biomass hard carbon material. According to the nanocarbon material composite biomass hard carbon material, the crosslinking degree of a carbon structure is adjusted by controlling a pyrolysis speed, so the distribution, the number, the size and the like of holes are adjusted; and by adding the graphene and the carbon nanotubes, the specific surface area, the electrical conductivity and the thermal conductivity of the material are improved, and structural stability is enhanced.

Description

Technical field: [0001] The invention relates to the field of electrochemical energy storage, in particular to a nano-carbon material composite biomass hard carbon electrode material and a preparation method and application thereof. Background technique: [0002] Electrochemical energy storage devices play an important role in the storage and utilization of clean energy, and are widely used in the automotive industry, aerospace, power grids, military equipment, mobile communications, and microelectronics. Carbon materials have the characteristics of abundant raw materials, low price, simple synthesis, stable chemical properties, low working potential and wide working temperature range, and are suitable as electrode materials for electrochemical energy storage devices. [0003] The biomass structure is loose and the primary pore structure is developed, and the carbon material obtained after carbonization can inherit part of its pore structure. Biomass carbon materials have t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/36H01M4/583H01M4/62H01M10/0525
CPCC01B32/05H01M4/362H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 赵丹丹征圣全王然
Owner 昆山昆鹏利杰高分子材料技术有限公司
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