Preparation method of carbon nanosheet negative electrode material and application of carbon nanosheet negative electrode material in sodium-ion batteries

A nanosheet and porous carbon technology, applied in the application of porous carbon nanosheet materials in sodium ion batteries, carbon materials, porous carbon nanosheet materials and their preparation fields, to achieve strong contact, long cycle life, and abundant active sites point effect

Active Publication Date: 2018-03-23
SHENZHEN RES INST CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the existing negative electrode materials of sodium ion batteries, the first purpose of the present invention is to propose a porous carbon nanosheet material with abundant reactive sites and large specific surface area

Method used

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  • Preparation method of carbon nanosheet negative electrode material and application of carbon nanosheet negative electrode material in sodium-ion batteries

Examples

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Effect test

Embodiment 1

[0032] Add 1 g of dopamine to a lithium chloride solution with a concentration of 10 g / L, adjust the pH of the solution to 8.5, and keep the temperature at 20° C. for 48 hours to obtain a polydopamine-lithium chloride gel; The precursor was obtained after carbonization and water washing in a quartz tube furnace, the carbonization temperature was 700°C, and the carbonization time was 5h. The obtained precursor was placed in an argon plasma furnace with a power of 90W and a pressure of 40Pa, and was etched for 200s to obtain a porous carbon nanosheet material. The thickness of carbon nanosheets is concentrated at about 70nm, and the specific surface area of ​​the obtained porous carbon nanosheets is 1870m 2 / g.

[0033] The carbon nanosheet material prepared in this example is used as the working electrode, sodium is used as the counter electrode, and the button battery is assembled into a button battery. At a current density of 50mA / g, the cycle performance is tested; The rat...

Embodiment 2

[0035] Add 1 g of dopamine to a lithium chloride solution with a concentration of 100 g / L, adjust the pH of the solution to 8.5, and keep the temperature at 30° C. for 40 hours to obtain a polydopamine-lithium chloride gel; The precursor was obtained after carbonization and water washing in a quartz tube furnace, the carbonization temperature was 600°C, and the carbonization time was 2h. The obtained precursor was placed in an argon plasma furnace with a power of 90W and a pressure of 40Pa, and was etched for 400s to obtain a porous carbon nanosheet material. The thickness of the carbon nanosheets is concentrated at about 20nm, and the specific surface area of ​​the obtained porous small-sized carbon nanosheets is 2070m 2 / g.

[0036]The carbon nanosheet material prepared in this example is used as the working electrode, sodium is used as the counter electrode, and the button battery is assembled into a button battery. At a current density of 50mA / g, the cycle performance is ...

Embodiment 3

[0038] Add 1 g of dopamine to a lithium chloride solution with a concentration of 1 g / L, adjust the pH of the solution to 8.5, and keep the temperature at 80°C for 20 hours to obtain a polydopamine-lithium chloride gel; The precursor was obtained after carbonization and water washing in a quartz tube furnace, the carbonization temperature was 500°C, and the carbonization time was 4h. The obtained precursor was placed in an argon plasma furnace with a power of 90W and a pressure of 40Pa, and was etched for 50s to obtain a porous carbon nanosheet material. The thickness of carbon nanosheets is concentrated at about 70nm, and the specific surface area of ​​the obtained porous carbon nanosheets is 670m 2 / g.

[0039] The carbon nanosheet material prepared in this example is used as the working electrode, sodium is used as the counter electrode, and the button battery is assembled into a button battery. At a current density of 50mA / g, the cycle performance is tested; The rate per...

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Abstract

The invention discloses a porous carbon nanosheet material, a preparation method thereof and application of the porous carbon nanosheet material serving as the negative electrode material of sodium-ion batteries. The preparation method includes: placing dopamine into a lithium chloride solution to perform polymerization reaction to obtain polydopamine-lithium chloride gel; subjecting the polydopamine-lithium chloride gel to high-temperature carbonization treatment to obtain a porous carbon nanosheet precursor; subjecting the porous carbon nanosheet precursor to argon plasma etching to obtain the porous carbon nanosheet material. The preparation method has the advantages that the method is simple, easy in raw material obtaining, good in repeatability and capable of achieving industrial production; the prepared porous carbon nanosheet material is large in specific surface area, rich in reaction active sites, moderate in interlayer spacing and the like; the porous carbon nanosheet material shows good battery performance hen being applied to the sodium-ion batteries.

Description

technical field [0001] The invention relates to a carbon material, in particular to a porous carbon nanosheet material and a preparation method thereof, and the application of the porous carbon nanosheet material in sodium ion batteries, belonging to the field of sodium ion batteries. Background technique [0002] Sodium-ion batteries have become a research hotspot in the new generation of secondary battery systems due to their rich sodium reserves and the advantages of existing battery achievements. Compared with lithium-ion batteries, sodium-ion batteries still have problems such as low specific capacity, which seriously limits the development of sodium-ion batteries. The radius of sodium ions is about 55% larger than that of lithium ions. The intercalation and diffusion of sodium ions in materials with the same structure are often relatively difficult. At the same time, the structural changes of the materials after intercalation will be greater. Cycle performance and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133
CPCH01M4/133H01M4/583Y02E60/10
Inventor 张治安陈玉祥李劼赖延清肖志伟尹盟胡德豪
Owner SHENZHEN RES INST CENT SOUTH UNIV
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