Porous hard carbon material as well as preparation method and application thereof

A technology of hard carbon and biomass materials, which is applied in the preparation/purification of carbon, active material electrodes, structural parts, etc., and can solve the problems of insufficient power batteries, insufficient rate performance, and insufficient capacity of secondary batteries.

Pending Publication Date: 2021-12-03
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interlayer spacing of graphite is not sufficient for Na with larger radii + It is free to intercalate between its layers, so it is very challenging for researchers to find suitable anode materials
[0003] Moreover, the capacity of the secondary battery using graphite material as the negative electrode material is insufficient, which cannot meet the needs of power batteries, the stability of the layered structure needs to be improved, and the rate performance is not good enough.

Method used

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  • Porous hard carbon material as well as preparation method and application thereof
  • Porous hard carbon material as well as preparation method and application thereof
  • Porous hard carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] This embodiment provides a kind of porous hard carbon material, and its structural schematic diagram is shown in figure 1 Shown, SEM picture see figure 2 , it can be seen that the porous hard carbon material is a honeycomb porous material with an irregular block-like macroscopic appearance, and the porous hard carbon material has a three-level porous structure of nano-macropores, mesopores and micropores.

[0075] Wherein, the particle size of the porous hard carbon material is 1-50 μm, the diameter of the nano-macropore structure is 50-200 nm, the diameter of the mesoporous structure is 2-30 nm, and the diameter of the micro-pore structure is ≤2 nm.

Embodiment 2

[0077] This example provides a porous hard carbon material, which is prepared by the following steps: dissolve 100g of starch in sufficient hot water, then add 10g of magnesium carbonate, stir evenly, and dry in a blast drying oven at 100°C to obtain a solid Precursor;

[0078] Put the solid precursor in a tube furnace, pass through nitrogen protection, then raise the temperature at 5°C / min to 1500°C for 5h, carry out preliminary hole making, and then cool naturally;

[0079] Mechanically crush the carbonized material after natural cooling into powder, add a sufficient amount of dilute sulfuric acid and stir for 2 hours, carry out pickling for secondary pore formation, then wash and filter until it is neutral, and dry to obtain a porous hard carbon material, which is recorded as PHC- 1.

[0080] The SEM image of the porous hard carbon material is shown in figure 2 As shown, a rich porous structure can be observed from the SEM image, and pore structures with different pore s...

Embodiment 3

[0082] This example provides a porous hard carbon material, which is prepared by the following steps: dissolve 100 g of polyacrylonitrile in a sufficient amount of DMF solvent, add 1 g of calcium carbonate, stir evenly, and then dry it in a blast drying oven at 150 ° C. obtain a solid precursor;

[0083] The solid precursor is placed in a tube furnace, protected by argon, and then heated to 1300°C at a constant temperature of 3°C / min for 3h for preliminary pore formation, and then naturally cooled;

[0084] Mechanically crush the carbonized material after natural cooling into powder, add a sufficient amount of dilute hydrochloric acid and stir for 2 hours, carry out pickling for secondary pore formation, then wash and filter until it is neutral, and dry to obtain a porous hard carbon material, which is designated as PHC-2 .

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Abstract

The invention belongs to the technical field of battery materials, and particularly discloses a porous hard carbon material as well as a preparation method and application thereof. The porous hard carbon material provided by the invention is a honeycomb-shaped porous material, and the interior of the porous hard carbon material has a three-stage porous structure of nano macropores, nano mesopores and nano micropores. The preparation method comprises the following steps: mixing a carbon source with a template agent to prepare a solid precursor; carrying out high-temperature heat treatment on the solid precursor in an inert gas atmosphere, and carrying out preliminary pore forming; and crushing the material subjected to heat treatment into powder, and carrying out acid pickling for secondary pore forming to obtain the porous hard carbon material. The hard carbon material prepared by the invention has a large interlayer spacing and a rich three-level nano porous structure, and provides more channels for transmission of lithium ions or sodium ions; and meanwhile, more active sites and lithium storage or sodium storage spaces are provided for ion intercalation and deintercalation, and a secondary battery made of the hard carbon material has high capacity and stable cycle performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to negative electrode materials for secondary batteries, in particular to a porous hard carbon material, a preparation method and application thereof. Background technique [0002] At present, the anode material of lithium-ion battery (LIB) in commercial application is mainly graphite material, and graphite relies on lithium ions to intercalate / extract from its long-range ordered carbon layer to store electricity. With the gradual maturity of lithium-ion battery technology and the explosive growth of demand, the consumption of lithium materials has been increasing, resulting in a sharp rise in lithium prices, and it is particularly important to find cost-effective alternative solutions for lithium-ion batteries. Na + have with Li + Due to similar physicochemical properties, abundant reserves and low cost, sodium-ion batteries (SIBs) have received extensive attention. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/583
CPCC01B32/05H01M4/583H01M2004/027Y02E60/10
Inventor 裴现一男赵中可孔令涌万远鑫陈心怡谭旗清赖佳宇张莉任望保
Owner SHENZHEN DYNANONIC
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