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A carbon-based negative electrode material with high ramp capacity and a preparation method and use thereof

A negative electrode material, carbon-based technology, applied in the field of materials, can solve the problems of unfavorable full battery performance, low efficiency of carbon-based negative electrode materials in the first week, etc., and achieve the effect of low carbonization temperature

Active Publication Date: 2019-01-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first-week efficiency of the carbon-based negative electrode materials obtained by pyrolysis of these organic precursors is particularly low, generally lower than 50%, which is not conducive to the performance of the full battery.
Pyrolyzing carbon source precursors at relatively lower temperatures and obtaining carbon-based anode materials with high capacity, high efficiency and high rate, there is no report in this regard

Method used

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  • A carbon-based negative electrode material with high ramp capacity and a preparation method and use thereof
  • A carbon-based negative electrode material with high ramp capacity and a preparation method and use thereof
  • A carbon-based negative electrode material with high ramp capacity and a preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Put 1 g of pitch into a 20 mL graphite crucible, put it into a tube furnace, and carbonize at 950 °C for 2 hours under an Ar atmosphere to obtain the final carbon-based negative electrode material. Its XRD and SEM are as follows Figure 1-Figure 2 shown. There is no obvious diffraction peak in XRD, indicating that the obtained carbon-based negative electrode material is an amorphous carbon-based negative electrode material. The obtained carbon-based negative electrode material is made into a pole piece, with metallic sodium as the counter electrode, and with 1mol / L NaPF 6 EC / DMC (1:1) is the electrolyte, assembled into a button battery, and its charge and discharge curve is measured at 0.1C, such as image 3 Shown, test result shows: electrochemical curve basically only comprises slope section (referring to comparative example 2 Figure 21 , in comparative example 2, its electrochemical curve includes platform section and slope section simultaneously, in the embodime...

Embodiment 2

[0065] Put 1g of anthracite in a 20mL graphite crucible, put it in a muffle furnace, and heat it at 350°C for 12 hours. The material taken out was treated under Ar atmosphere at 650°C for 24 hours to obtain the final carbon-based negative electrode material. Its Raman spectrum is as Figure 4 As shown, the ID / IG value calculated by Raman spectrum is 2.57, which shows that the prepared carbon-based negative electrode material has a high degree of disorder and small graphitized sheets. The obtained carbon-based negative electrode material is made into a pole piece, with metal sodium as the counter electrode, and 1mol / L NaPF 6 EC / DMC (1:1) is the electrolyte, assembled into a button battery, measured its charge and discharge curve at 0.1C, the charge capacity in the first week is 219.1mAh / g, almost all of the capacity comes from the slope section, and the Coulombic efficiency in the first week Up to 79%.

Embodiment 3

[0067] After crushing 2g of corn stalks, disperse them in 50mL of water, place them in a 100mL beaker, put them in an oven and heat them to 180°C for 24 hours. Then the washed and dried powder was placed in a tube furnace under N 2 Under the atmosphere, treat at 700°C for 10 hours to obtain the final carbon-based negative electrode material. The obtained carbon-based negative electrode material is made into a pole piece, with metal sodium as the counter electrode, and 1mol / L NaPF 6 EC / DMC (1:1) is the electrolyte, assembled into a button battery, and its charge and discharge curve is measured at 0.1C, such as Figure 5 As shown, the test results show that the capacity is as high as 230.5mAh / g, almost all of which comes from the slope section, and the Coulombic efficiency is as high as 75.9% in the first week.

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Abstract

An embodiment of the invention relates to a carbon-based negative electrode material with high ramp capacity and a preparation method and use thereof. The method comprises: placing a carbon source precursor in a crucible, placing the precursor in a heating device, and heating the precursor in an inert atmosphere at 0.2 DEG C / min to 30 DEG C / min to 400 DEG C to 1000 DEG C; wherein the carbon sourceprecursor comprises any one or a combination of at least two of fossil fuel, biomass, resin, and organic chemical; the carbon source precursor is subjected to heat treatment at low temperature at 400DEG C to 1000 DEG C for 0.5 to 48 hours, carbonizing that precursor of the carbon source to obtain a carbon-based negative electrode material; The specific surface area of carbon-based cathode material obtained by low temperature heat treatment is less than 10m2 / g. The carbon-based negative electrode material is assembled into the sodium ion battery, and then is charged and discharged between 0 to 2.5 V, and the voltage curve with high ramp capacity is obtained. The ramp capacity is above 180 mAh / g and the first-cycle Coulomb efficiency is above 75%. By coating the surface, the specific surface area can be further reduced, and the first-cycle efficiency and reversible specific capacity can be improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a carbon-based negative electrode material with high slope capacity, a preparation method and application thereof. Background technique [0002] Energy is the basis for the survival of human society, and with the development of human society, people's demand for energy is increasing. Human beings' current energy mainly comes from fossil fuels such as oil, coal and natural gas, but these energy reserves are limited, it is difficult to maintain sustainable development of human beings, and it will bring serious problems of greenhouse effect and environmental pollution. In recent years, clean energy represented by solar energy, wind energy, and tidal energy has attracted widespread attention, but the output of these energy sources has temporal discontinuity and spatial distribution inhomogeneity. Therefore, the research and development of efficient and cheap large-scale energy sto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/05H01M10/054
CPCH01M4/583H01M10/05H01M10/054Y02E60/10C01B32/05C01P2006/12C01P2006/40C01P2002/74C01P2004/03C01P2004/04H01M4/133H01M4/1393H01M4/587C01P2002/01C01P2002/82H01M10/0525H01M2004/021
Inventor 胡勇胜戚钰若陆雅翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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