A kind of preparation method of gan nanowire lithium ion battery negative electrode material
A technology of lithium-ion batteries and negative electrode materials, applied in the field of electrochemical power sources, can solve the problems of unsatisfactory cycle performance, poor electrochemical reaction kinetics of GaN, difficult to control the shape and structure, and achieve good cycle stability and reliability. The effect of strong repeatability and simple synthesis process
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Embodiment 1
[0027] Weigh 3mmol of acetylacetone and 10mmol of Ga(NO 3 ) 3 ·xH 2 O was added to the beaker, and an appropriate amount of N,N-dimethylformamide was added. Then 3g of polyvinylpyrrolidone was added to the beaker and stirred for 12h to form a colorless and transparent solution, which was then transferred to a 10mL electrospinning syringe. After spinning at 16 kV for 5 h, the resulting fabric was immediately transferred to a 100 °C oven for 12 h, dried and then sintered in a muffle furnace for 3 h at a heating rate of 5 °C / min and a sintering temperature of 750 °C. ℃, the obtained product is annealed in ammonia gas for 5h, and the temperature is 800 ℃ to obtain GaN nanowires. The prepared samples were analyzed by XRD patterns, such as figure 1 As shown, the resulting diffraction peaks correspond to GaN (PDF#01-073-7289), indicating that GaN was successfully fabricated. The SEM of the prepared samples is as figure 2 As can be seen in the figure, GaN is in the form of nanow...
Embodiment 2
[0030] Weigh 10 mmol Ga(NO 3 ) 3 ·xH 2 O was added to the beaker, and an appropriate amount of N,N-dimethylformamide was added, and then 3 g of polyvinylpyrrolidone was added to the beaker, and a homogeneous solution could not be obtained after stirring for 12 hours. The prepared samples are as Figure 4 As shown, it was a large amount of gel, and electrospinning was not possible.
Embodiment 3
[0032] Weigh 3mmol of acetylacetone and 10mmol of Ga(NO 3 ) 3 ·xH 2 O was added to the beaker, and an appropriate amount of N,N-dimethylformamide was added. Then 3g of polyvinylpyrrolidone was added to the beaker and stirred for 12h to form a colorless and transparent solution, which was then transferred to a 10mL electrospinning syringe. Spinning at 16 kV for 5 h. After spinning, the resulting fabric was immediately transferred to a 100 °C oven for 12 h. After drying, it was sintered in a muffle furnace for 3 h at a heating rate of 5 °C / min and a sintering temperature of 750 °C. ℃, the obtained product was annealed in ammonia gas for 5h, and the temperature was 700 ℃ to obtain GaN nanowires.
[0033] The material obtained in Example 3 is basically the same as that in Example 1, and a battery is made according to the method of Example 1. like Figure 5 As shown, the first charge and discharge specific capacities are 140.8 and 436.6mAh g, respectively -1 , there is an obvi...
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