A kind of hard carbon negative electrode material and its preparation method and application
A negative electrode material, hard carbon technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of difficult industrial production, high cost, complex preparation process, etc., and achieve stable product properties, low cost, and good electrochemical performance. Effect
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Embodiment 1
[0038] The coal tar pitch is pulverized to less than 0.1 mm, and 100 g of benzaldehyde, 50 g of sulfuric acid and 1000 g of the coal tar pitch powder are added to the reaction kettle under stirring, and the temperature is raised to 200 ° C for cross-linking reaction and polymerization for 5 hours to obtain cross-linking polymerization. After the reaction, it was dissolved in 500 g of washing oil at 200 ° C for 2 hours, hot filtered, the filtrate was vacuum-dried (-0.09 ~ -0.1 MPa, 150 ° C) for 2 hours, cooled to room temperature and discharged. 100 mesh sieve, put it into a well-type carbonization furnace, heat it up to 600 ℃ under nitrogen protection for pre-carbonization treatment for 2 hours, cool down to room temperature, and pass the pulverized material through a 100 mesh sieve after crushing, and put it in a pusher kiln under nitrogen protection. After carbonization treatment at 1000°C for 2 hours, a hard carbon negative electrode material was prepared. The first discharg...
Embodiment 2
[0040] The coal tar pitch was pulverized to less than 0.1 mm, 300 g of formaldehyde, 50 g of sulfuric acid and 1000 g of the coal tar pitch powder were added to the reaction kettle under stirring and mixed, and the temperature was raised to 80 ° C for cross-linking reaction and polymerization reaction for 10 hours. Dissolve the filtrate in 2000g toluene at 100℃ for 6 hours, filter it hot, vacuum dry the filtrate (-0.09~-0.1MPa, 150℃) for 2 hours, cool down to room temperature and discharge the material. In the type carbonization furnace, the temperature was raised to 400 °C under nitrogen protection for 5 hours of pre-carbonization treatment, and then cooled to room temperature. hour, the hard carbon anode material was prepared, the first discharge capacity of the half-cell was 296.4mAh / g, and the first discharge efficiency was 76.5%.
Embodiment 3
[0042]Pulverize the petroleum asphalt to less than 0.1 mm, add 200 g of paraformaldehyde, 100 g of p-toluenesulfonic acid and 1000 g of the petroleum asphalt powder alternately into the reaction kettle under stirring, and then heat up to 150 ° C to carry out cross-linking reaction and polymerization reaction 2 hours, dissolve in 1250g xylene at 150°C for 4 hours after the reaction, filter hot, vacuum dry the filtrate (-0.09~-0.1MPa, 150°C) for 2 hours, cool down to room temperature and discharge, pulverize the pulverized product After passing through a 100-mesh sieve, it was put into a well-type carbonization furnace, and the temperature was raised to 500 ° C under nitrogen protection for pre-carbonization for 4 hours, and then cooled to room temperature. After being carbonized at 1600°C for 2 hours, a hard carbon negative electrode material was prepared. The first discharge capacity of the half cell was 285.7mAh / g, and the first discharge efficiency was 78.5%.
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