Pyrolysis preparation method of two-dimensional nano-sheet-layer lithium ion battery negative electrode material

A lithium-ion battery and carbon nanosheet technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process, unsuitability for mass production, and high cost of synthetic materials, and achieves low preparation cost and no capacity. Attenuation, high degree of graphitization effect

Inactive Publication Date: 2013-07-31
TIANJIN UNIV
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Problems solved by technology

[0005] It can be seen from the above synthesis process that in the current preparation methods for synthesizing two-dimensional carbon nanosheet materials, the requirements for the selection of reactants or templates are relatively high during synthesis, and some synthesis methods have complicated preparation processes and difficult control of the process, resulting in The cost of synthetic materials is relatively high, and it is not suitable for mass production

Method used

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  • Pyrolysis preparation method of two-dimensional nano-sheet-layer lithium ion battery negative electrode material
  • Pyrolysis preparation method of two-dimensional nano-sheet-layer lithium ion battery negative electrode material
  • Pyrolysis preparation method of two-dimensional nano-sheet-layer lithium ion battery negative electrode material

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Embodiment 1

[0024] Weigh 5 g of glucose, 3.366 g of ferric nitrate and 48.213 g of sodium chloride and add them into 175 mL of deionized water to prepare a mixed solution. Put the mixed solution into a Φ80 petri dish and place it in a vacuum drying oven with the open mouth, and dry it in vacuum at 80°C. After the water is completely evaporated, a uniform solid mixture is obtained. The solid mixture was pulverized and passed through a 100-mesh sieve to obtain a precursor powder. Take 4 g of precursor powder and spread evenly on the bottom of the corundum ark, place the ark in the constant temperature zone of the tube furnace, and flow Ar gas at a flow rate of 200 mL / min for 40 min to remove the air in the tube, and then start heating. The temperature was raised to 300 °C for 1 h at a heating rate of 5 °C / min, and then heated to 700 °C for 2 h at a heating rate of 5 °C / min. After the heat preservation is over, the sample is cooled to room temperature with the furnace, taken out, and ground...

Embodiment 2

[0027]Weigh 5 g of glucose, 3.366 g of ferric nitrate and 48.213 g of sodium chloride and add them into 175 mL of deionized water to prepare a mixed solution. Put the mixed solution into a Φ80 petri dish and place it in a vacuum drying oven with the open mouth, and dry it in vacuum at 80°C. After the water is completely evaporated, a uniform solid mixture is obtained. The solid mixture was pulverized and passed through a 100-mesh sieve to obtain a precursor powder. Take 10 g of precursor powder and spread evenly on the bottom of the corundum ark, place the ark in the constant temperature zone of the tube furnace, and flow Ar gas at a flow rate of 200 mL / min for 40 min to remove the air in the tube, and then start heating. The temperature was raised to 300 °C for 1 h at a heating rate of 5 °C / min, and then heated to 700 °C for 2 h at a heating rate of 5 °C / min. After the heat preservation is over, the sample is cooled to room temperature with the furnace, taken out, and ground...

Embodiment 3

[0029] Weigh 5 g of glucose, 3.366 g of ferric nitrate and 48.213 g of sodium chloride and add them into 175 mL of deionized water to prepare a mixed solution. Put the mixed solution into a Φ80 petri dish and place it in a vacuum drying oven with the open mouth, and dry it in vacuum at 80°C. After the water is completely evaporated, a uniform solid mixture is obtained. The solid mixture was pulverized and passed through a 100-mesh sieve to obtain a precursor powder. Take 4 g of precursor powder and spread evenly on the bottom of the corundum ark, place the ark in the constant temperature zone of the tube furnace, and flow Ar gas at a flow rate of 200 mL / min for 40 min to remove the air in the tube, and then start heating. The temperature was raised to 300 °C for 1 h at a heating rate of 5 °C / min, and then heated to 800 °C for 2 h at a heating rate of 5 °C / min. After the heat preservation is over, the sample is cooled to room temperature with the furnace, taken out, and ground...

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Abstract

The invention discloses a pyrolysis preparation method of a two-dimensional nano-sheet-layer lithium ion battery negative electrode material. The method comprises the steps that: a mixed solution comprising glucose, ferric nitrate and sodium chloride is prepared by using deionized water; the solution is dried and grinded into powder; the powder is added into a tubular furnace and is heated, and is cooled with the furnace; the powder is fetched and finely grinded, such that gray-black powder is obtained; the gray-black powder is dispersed into deionized water, such that a suspension liquid is obtained; pump-filtration and washing are carried out, such that black powder is obtained; the black powder is dispersed in hydrochloric acid; and water-bath heating, refluxing, pump-filtration, and washing are carried out, such that the two-dimensional nano-sheet-layer lithium ion battery negative electrode material is obtained. According to the method, the raw materials are cheap and are easy to obtain; a preparation cost is low; a process is simple and feasible; and continuous large-scale production can be carried out. The obtained material has high graphitization degree, large specific surface area, and substantial mesoporous characteristics. As the lithium ion battery negative electrode material, the material has good circulation performance, good rate performance, good stability, and wide application prospect.

Description

technical field [0001] The invention relates to a pyrolysis preparation method of a two-dimensional carbon nano sheet lithium ion battery negative electrode material, which belongs to the preparation technology of lithium ion secondary battery electrode materials. Background technique [0002] As a secondary battery, lithium-ion battery has the characteristics of high energy density, high discharge voltage, wide working range, no memory effect, and no environmental pollution. It has been widely used in portable electronic devices such as mobile phones and notebook computers. Electric vehicles, aerospace and other fields also show good application prospects. An important task in the development of new lithium-ion batteries is to find electrode materials with excellent performance, so that the batteries have high discharge voltage, high capacity and longer life. As a new type of material, carbon nanomaterials have attracted extensive attention as anode materials for lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCY02E60/12Y02E60/10
Inventor 何春年陈龙赵乃勤师春生刘恩佐李家俊
Owner TIANJIN UNIV
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