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Method for preparing biochar/carbon nano-tubes for cathode materials for sodium ion batteries

A sodium ion battery and carbon nanotube technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of long reaction cycle, difficult control, and high energy consumption in the reaction process, and achieve short reaction time and high heating efficiency. Uniformity and simple preparation method

Active Publication Date: 2016-10-26
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

The above-mentioned high-temperature carbonization method needs to be activated in the air, or the process of immersion activation is required. There are disadvantages such as high energy consumption in the reaction process, difficult control, and long reaction cycle. Therefore, a simple, easy-to-control, and rapid synthesis of biomass carbon is sought. It is of great significance to the research and development of high-performance sodium-ion battery anode materials

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  • Method for preparing biochar/carbon nano-tubes for cathode materials for sodium ion batteries
  • Method for preparing biochar/carbon nano-tubes for cathode materials for sodium ion batteries
  • Method for preparing biochar/carbon nano-tubes for cathode materials for sodium ion batteries

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preparation example Construction

[0028] A preparation method of biological carbon / carbon nanotubes for negative electrode materials of sodium ion batteries, comprising the following steps:

[0029] 1) Wash the pomelo peel to remove surface impurities, and cut it into uniform block A with a diameter of 4-6mm;

[0030] 2) Freeze-drying uniform block A at a temperature of -9°C to -5°C for 12 to 36 hours to obtain block B;

[0031] 3) Add the concentration of 1~5mol·L to block B -1 After adjusting the pH to 1-3 with concentrated sulfuric acid, add carbon nanotubes with a diameter of 50-100 nm and ultrasonically treat them for 12-24 hours, and then put them into the homogeneous equipment and raise the temperature from room temperature to 150 °C at a rate of 6-15 °C / min. ℃~200℃ and keep warm for 12~24h, then naturally cool to room temperature, the temperature is measured by platinum resistance, and the reaction product C is obtained, wherein the mass ratio of block B to carbon nanotube is 5:1~9:1;

[0032] 4) Aft...

Embodiment 1

[0036] (1) Wash the pomelo peel to remove surface impurities, and cut it into pieces A with a diameter of 4 mm;

[0037] (2) Freeze-dry the uniform block A at a temperature of -9°C for 12 hours to obtain block B;

[0038] (3) Add 2mol·L to block B -1 Concentrated sulfuric acid, adjust the pH to 1, and add carbon nanotubes with a diameter of 50nm according to the mass ratio of B: carbon nanotubes of 5:1, ultrasonic for 12h, and then perform a homogeneous reaction, with a heating rate of 6°C / min. The temperature was raised from room temperature to 150°C and kept for 12 hours, and then naturally cooled to room temperature to obtain reaction product C;

[0039] (4) After the reaction product C was filtered and dried by suction, it was moved into a tubular atmosphere furnace for carbonization with nitrogen gas. The carbonization temperature was raised to 50°C in 10 minutes, and then to 500°C in 75 minutes. ;

[0040] (5) The carbonized product D was first soaked in deionized wat...

Embodiment 2

[0042] (1) Wash the pomelo peel to remove surface impurities, and cut it into pieces A with a diameter of 6 mm;

[0043] (2) Freeze-dry the uniform block A at a temperature of -8°C for 18 hours to obtain block B;

[0044] (3) Add 3mol·L to block B -1 concentrated sulfuric acid, adjust the pH to 2, and add carbon nanotubes with a diameter of 60nm according to the mass ratio of B: carbon nanotubes of 6:1, ultrasonication for 16h, followed by a homogeneous reaction, with a heating rate of 8°C / min. The room temperature was raised to 160°C and kept for 16 hours, and then naturally cooled to room temperature to obtain the reaction product C;

[0045] (4) After the reaction product C was filtered and dried by suction, it was moved into a tubular atmosphere furnace for carbonization with nitrogen gas. The carbonization temperature was raised to 50°C in 10 minutes, and then to 600°C in 75 minutes. It was kept for 2 hours, and then naturally cooled to room temperature to obtain the car...

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Abstract

The invention discloses a method for preparing biochar / carbon nano-tubes for cathode materials for sodium ion batteries. The method includes (1), washing pomelo peel, clearing impurities on the surfaces of the pomelo peel and cutting the pomelo peel to obtain uniform pieces A; (2), carrying out freeze drying on the uniform pieces A to obtain pieces B; (3), adding concentrated sulfuric acid into the pieces B, then adding carbon nano-tubes into the pieces B, carrying out ultrasonic treatment on the pieces B, then arranging the pieces B in homogenous-phase equipment and carrying out homogenous-phase reaction to obtain reaction products C; (4), carrying out suction filtration on the reaction products C, drying the reaction products C, then shifting the reaction products C into a tube atmosphere furnace and carbonizing the reaction products C to obtain carbonization products D; (5), respectively carrying out soaking, washing and suction filtration on the carbonization products D by the aid of deionized water and absolute ethyl alcohol and then drying the carbonization products D to obtain the cathode materials for the sodium ion batteries. The cathode materials are of three-dimensional nano-tube structures. The method has the advantages that the biochar / carbon nano-tubes prepared by the aid of the method are homogenous in composition and high in purity and are of the three-dimensional nano-tube structures, sodium ion diffusion paths can be effectively shortened by the three-dimensional nano-tube structures, and accordingly the capacity and the cyclic stability of the sodium ion batteries can be improved.

Description

technical field [0001] The invention belongs to the field of preparation of negative electrode materials of sodium ion batteries, and in particular relates to a method for preparing biological carbon / carbon nanotubes for negative electrode materials of sodium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in the portable electronics market due to their high energy density, long cycle life, and no memory effect. However, as industries such as vehicles and large-scale power systems rely more heavily on lithium-ion batteries, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries, which will further push up the prices of lithium-related materials and increase the battery capacity. cost, which ultimately hinders the development of the new energy industry. Therefore, it is critical to develop other related energy storage technologies that are inexpensive alternatives to lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 黄剑锋李瑞梓王瑞谊李文斌许占位曹丽云李嘉胤何元元
Owner SHAANXI UNIV OF SCI & TECH
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