Research Of Impacts Of Electrochemical Performance Of Lithium-ion Battery Cathode Materials Li_1+xV₃O₈ In Electrospinning Synthetizing Conditions

With advancements in technology, the lithium ion batteries play an important role in every aspect. But nowadays the capacity of lithium ion batteries is low and can’t meet the need of people. Li1+xV3O8 has high capacity, which can improve the performance of lithium ion batteries in a certain extent. In this paper, the optimum conditions of the product have been explored by changing the electrospinning conditions.This article explored the performance of the product which was obtained by integrating the optimal conditions of electrospinning. After experiments, we dissolved 4 mmol LiNO3, 12 mmol NH4VO3 and 16 mmol C6H8O7·H2O in a dissolvent mixed by ethanol and deionized water(the ratio is 1:1) to get a sol, then dissolved 1.2 g PVP to get the spinning solution. We electrospun some Li1+x V3O8 presoma at the voltage of 15 kV, then calcined in air at 450 ℃ for 5 h. We characterized the product with FTIR, SEM, XRD, charge/discharge process. The results show that the Li1+xV3O8 made by electrospinning has 1μm~1.5μm diameter, several hundred nanometers length. Its initial discharge capacity is 283.4 mAh·g-1, and its discharge capacity remains 200 mAh·g-1 after the 100 th cycle.We studied electrospinning rate, electrospinning distance and calcination velocity of heating up’s influence to the product’s capacity by experiment. It shows that at the electrospinning rate of 0.15 mm/min the product has the best capacity. The initial discharge capacity is 283.4 mAh·g-1. Electrospinning rate is smaller, the electrochemical performance of the anode materials prepared is better. The electrochemical properties of the anode materials prepared by different electrospinning distance are similar. The initial discharge capacity is approximately 280 mAh·g-1. After 50 weeks of charging and discharging cycle test, discharge capacity is about 225 mAh·g-1. Electrospinning distance within a certain range has less effect on the electrochemical properties. The initial discharge capacity of the product prepared at the velocity of heating up of 0.5 / min is the largest ℃and the electrochemical performance is good, the increasing of heating rate will reduce the electrochemical properties of the product.