Method for uniformly and controllably coating conducting carbon layer at surface of LiFePO4 granule surface
A conductive carbon and particle surface technology, applied in the direction of circuits, coatings, electrical components, etc., can solve the problems of inability to achieve uniform coating, large capacity loss, etc., and achieve the effect of increased conductivity and uniform thickness
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[0025] Example 1.
[0026] Put LiFePO 4 The powder is placed in the constant temperature zone of the chemical vapor deposition furnace, and then evacuated for 1 hour (the vacuum degree reaches about 10Pa). After the air in the furnace is exhausted, nitrogen is introduced. After the temperature is increased to 720°C, acetylene gas is introduced for chemical vaporization. Deposition. In the furnace gas, the volume percentage of acetylene gas is 20%, and the deposition time is 2 hours. The deposited carbon sample is cooled to room temperature with the furnace and taken out. X-ray diffraction analysis was performed on the sample of deposited carbon, and the sample before deposition ( Figure 1a )Compare found LiFePO 4 The structure of has not changed after carbon deposition ( Figure 1b ). Transmission electron microscopy observation results show that the thickness of the deposited carbon layer is very uniform ( Figure 2a ), the thickness of the carbon layer is about 20 nanometers ( ...
Example Embodiment
[0027] Example 2.
[0028] The difference from Example 1 lies in:
[0029] Put LiFePO 4 The powder is placed in the constant temperature zone of the chemical vapor deposition furnace, and then evacuated for 1 hour (the vacuum degree reaches about 10Pa). After the air in the furnace is exhausted, nitrogen is introduced. After the temperature is raised to 700°C, acetylene gas is introduced for chemical vaporization. Deposition. In the furnace gas, the volume percentage of acetylene gas is 5%, and the deposition time is 2 hours. Transmission electron microscope observation results show that the thickness of the deposited carbon layer is about 5 nanometers, and the thickness is very uniform ( Figure 4 ). The apparent conductivity of the deposited carbon sample is 1.04Ω -1 ·M -1 .
Example Embodiment
[0030] Example 3.
[0031] The difference from Example 1 lies in:
[0032] Put LiFePO 4 The powder is placed in the constant temperature zone of the chemical vapor deposition furnace, and then purged with argon for 2 hours. After the temperature is raised to 700°C, acetylene gas is introduced for chemical vapor deposition. In the furnace gas, the volume percentage of acetylene gas is 20%, and the deposition time is 0.5 hours. Transmission electron microscope observation results show that the thickness of the deposited carbon layer is about 8 nanometers, and the thickness is very uniform ( Figure 5 ). The apparent conductivity of the deposited carbon sample is 1.29×10 -1 Ω -1 ·M -1 .
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