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Preparation method of high-performance Si/C negative electrode material

A negative electrode material and high-performance technology, which is applied in the field of preparation of high-performance Si/C negative electrode materials, can solve the problems of waste of high-quality C resources, complicated preparation methods, and high cost, and achieve excellent electrochemical performance, simplified preparation process, and low cost Effect

Pending Publication Date: 2020-03-31
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the current method of preparing Si / C anode materials from rice husks not only wastes high-quality C resources in rice husks and emits a large amount of greenhouse gases, but also has complex preparation methods, low efficiency, and high cost.

Method used

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  • Preparation method of high-performance Si/C negative electrode material
  • Preparation method of high-performance Si/C negative electrode material
  • Preparation method of high-performance Si/C negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of high-performance Si / C negative electrode material, comprising the following steps:

[0039] (1) removing impurities, cleaning and drying the rice husks obtained from the rice factory to obtain clean rice husk raw materials;

[0040] (2) Take 100g of clean rice husk and place it in the constant temperature zone of the horizontal tube furnace. 2 atmosphere (N 2 The flow rate of 100mL / min) was raised to 850°C at 5°C / min, and the N 2 Atmosphere switched to CO 2 Atmosphere (CO 2 The flow rate of 200mL / min), heat treatment at constant temperature for 2h, and then in N 2 Natural cooling in the atmosphere to below 100°C;

[0041] (3) Weigh NaCl2.86g, AlCl 3 10.94g, grind and mix the two in a dry environment, then weigh 3.6g of the heat-treated product of rice husk and 1.0g of aluminum powder (100-200 mesh), add them to a wear-resistant steel tank, add wear-resistant steel Ball 230g, seal the lid of the ball mill tank, open the inlet valve and outl...

Embodiment 2

[0047] A preparation method of high-performance Si / C negative electrode material, comprising the following steps:

[0048] (1) removing impurities, cleaning and drying the obtained rice husk;

[0049] (2) Take 100g of clean rice husk and place it in the constant temperature zone of the horizontal tube furnace. 2 atmosphere (N 2 The flow rate of 150mL / min) is raised to 950°C at 10°C / min, and the N 2 Atmosphere switched to CO 2 Atmosphere (CO 2 The flow rate of 600mL / min), heat treatment at constant temperature for 3h, and then in N 2 Natural cooling in the atmosphere to below 100°C;

[0050] (3) Weigh NaCl4.51g, AlCl 3 15.09g, grind and mix the two in a dry environment, then weigh 4.20g of the heat-treated product of rice husk and 2.33g of magnesium powder (100-200 mesh), add them to a wear-resistant steel tank, add wear-resistant steel Ball 340g, seal the lid of the ball mill tank, open the inlet valve and outlet valve on the tank lid, flush the raw materials in the tan...

Embodiment 3

[0055] A preparation method of high-performance Si / C negative electrode material, comprising the following steps:

[0056] (1) removing impurities, cleaning and drying the rice husk raw material;

[0057] (2) Take 100g of clean rice husk and place it in the constant temperature zone of the horizontal tube furnace. 2 atmosphere (N 2 The flow rate of 150mL / min) is raised to 900°C at 10°C / min, and the N 2 Atmosphere switched to CO 2 Atmosphere (CO 2 The flow rate is 400mL / min), heat treatment at constant temperature for 2h, and then in N 2 Natural cooling in the atmosphere to below 100°C;

[0058] (3) Weigh NaCl4.93g, AlCl 3 15.20g, grind and mix the two in a dry environment, then weigh 4.5g of the heat-treated product of rice husk and 1.25g of aluminum powder (100-200 mesh), add them to a wear-resistant steel tank, add wear-resistant steel Ball 365g, seal the lid of the ball mill tank, open the inlet valve and outlet valve on the tank lid, flush the raw materials in the t...

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Abstract

The invention provides a preparation method of a high-performance Si / C negative electrode material. The invention relates to the technical field of composite material preparation, in particular to a method for preparing a composite material, which mainly comprises the following steps: carrying out heat treatment on clean rice husks in a CO2 atmosphere, mixing the heat-treated product with a properamount of NaCl, AlCl3, Al or Mg powder, putting the mixture into a heat-insulating ball-milling tank, and carrying out ball-milling at 160-200 DEG C for 15-20 hours; and soaking the ball-milled product with HCl acid and HF acid, carrying out centrifugal washing separation, and carrying out vacuum drying to obtain the Si / C negative electrode material. Si and C resources of the rice husks are fullyutilized, and the prepared Si / C negative electrode material is high in specific capacity, good in rate capability and excellent in cycle performance; meanwhile, the preparation process is simple, high in efficiency, free of complex equipment, low in cost, environmentally friendly and capable of being directly used for industrial production.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of a high-performance Si / C negative electrode material. Background technique [0002] As a lithium-ion battery negative electrode material, the specific capacity of Si material (theoretical capacity 3500mAh / g) is much greater than that of commercial graphite negative electrode material (theoretical capacity 372mAh / g), and Si is abundant in the earth's crust and cheap, so it is widely used It is considered that Si material is the most promising anode material for lithium-ion batteries. However, the volume expansion of Si anode material is serious during the discharge process, and the volume expansion of Si is as high as 300% in the state of fully intercalating lithium. Severe volume expansion leads to fragmentation of Si particles, resulting in the separation of Si particles from the conductive agent or current collector, and the contin...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCH01M4/628H01M4/625H01M4/386H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 方道来王珊珊张公平胡太顺赵一成檀杰郑翠红
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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