Preparation method and application of nano TiO2(B)/carbon composite fibers for lithium ion battery cathode
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A lithium-ion battery, carbon composite technology, applied in the fields of electrochemistry and material chemistry, to achieve the effects of low production cost, simple process and mature technology
Inactive Publication Date: 2013-12-18
EAST CHINA UNIV OF SCI & TECH
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Embodiment 1
[0018] Embodiment 1 prepares TiO 2 (B) / C composite fiber Ⅰ
[0019] Under the condition of magnetic stirring, dissolve 0.8g tetrabutyl titanate and 0.4g PVP in the mixed solution of 6mL ethanol, 2mL acetic acid and 1mL N,N-dimethylformamide, mix and stir evenly. Take 10mL of the solution with a syringe, the front of the spinneret is a copper mesh collection device, the voltage is 10kV, and the flow rate is 1.0mL / h. After spinning, the TBT / PVP precursor fiber was obtained, the fiber membrane was carefully removed, and vacuum dried at 60°C. Then, under the protection of nitrogen, the temperature was raised to 300° C. for calcination at a rate of 2° C. / min, and the temperature was kept for 120 minutes.
[0020] 0.35 g of the calcined sample was dissolved in 10M NaOH solution to obtain a suspension. React in a closed 50mL hydrothermal kettle at 200°C for 24 hours. After stopping the reaction, wash the precipitated product with 0.1M hydrochloric acid and deionized water until th...
Embodiment 2
[0022] Embodiment 2 prepares TiO 2 (B) / C composite fiber Ⅱ
[0023] Under the condition of magnetic stirring, 0.8g of tetrabutyl titanate and 0.4g of PVP were dissolved in a mixed solution of 5mL of ethanol, 2mL of acetic acid and 1mL of N,N-dimethylformamide. Mix and stir well. Take 10mL of the solution with a syringe, the front of the spinneret is a copper mesh collection device, the voltage is 11kV, and the flow rate is 1.0mL / h. After spinning, the TBT / PVP precursor fiber was obtained, the fiber membrane was carefully removed, and vacuum dried at 60°C. Then, under the protection of nitrogen, the temperature was raised to 500° C. for calcination at a rate of 2° C. / min, and the temperature was kept for 120 minutes.
[0024] Dissolve 0.4g of the calcined sample in 10M NaOH solution to obtain a suspension, react in a closed 50mL hydrothermal kettle at 180°C for 24 hours, stop the reaction, and wash the precipitated product with 0.1M hydrochloric acid and deionized Wash with...
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Abstract
The invention relates to a preparation method and application of nano TiO2(B)/carbon composite fibers for a lithium ion battery cathode. The preparation method comprises the following steps: firstly, synthesizing tetrabutyl titanate/polyvinylpyrrolidone precursor fibers through electrostatic spinning; then, drying the precursor fibers, and carbonizing the precursor fibers at the temperature of 300-500 DEG C under the protection of nitrogen or argon; finally, carrying out hydro-thermal treatment on the carbonized product to obtain the nano TiO2(B)/carbon composite fibers. The preparation method disclosed by the invention is simple and convenient, the composition of titanium dioxide and carbon source is realized in one step, and the introduction of carbon source is not required in subsequent experiment, thus the purity of a product is ensured, the raw material is saved, and the production cost is low. The obtained nano TiO2(B)/carbon composite fibers for the lithium ion battery cathode material have good cycle performance, and can keep high capacity especially at quick charging and discharging rates, thus the cycle efficiency is high, the capacity is reduced slowly, the conductivity is improved because of the introduction of carbon, and the resistance is reduced.
Description
technical field [0001] The invention discloses a nano-TiO used for lithium-ion battery negative electrode 2 The preparation method and application of (B) / carbon composite fiber belong to the fields of electrochemistry and material chemistry. Background technique [0002] Titanium dioxide has become a research hotspot in the field of materials due to its broad application prospects in photocatalysis, photolysis of water, sensors, dye-sensitized solar cells, and lithium-ion batteries. Common titanium dioxide mainly includes four crystal phases: anatase phase, rutile phase, brookite phase and TiO 2 (B) phase. Among all crystal phases, TiO 2 (B)-type titanium dioxide belongs to the monoclinic system, with the loosest structure, large interlayer spacing and low density, which is conducive to the intercalation and removal of lithium ions, so it has potential superior performance in the application of lithium-ion batteries . [0003] To a large extent, TiO 2 (B) The size, mor...
Claims
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