Study on manufacture and performance of negative electrode material for Electric vehicle battery
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In this paper, Ni-NiO/PCNs anode materials were prepared by in-situ synthesis. The effects of sodium chloride template, annealing temperature and annealing time on the phase composition, microstructure and electrochemical properties of the anode materials were compared and analyzed. The results show that Ni/PCNs, Ni-NiO/C and Ni-NiO/PCNs anode materials mainly contain nickel and amorphous carbon phase, and the latter two anode materials also contain nickel oxide phase. 300C / 4h is the suitable annealing process for Ni-NiO/PCNs anode materials, when the Ni-NiO particles in Ni-NiO/PCNs anode materials are well dispersed and maintain three-dimensional lamellar structure, and the average size is about 27nm. If the annealing time is too long (6h), the nickel particles will peroxidize and agglomerate, while too high temperature (400 ℃) will make the particles mainly agglomerate and the three-dimensional lamellar structure will disappear. When the current density is 1A/g and the discharge capacity of Ni-NiO/PCNs anode material is 235mA h / g after 5000 cycles, the discharge capacity is about 83.93% of the discharge capacity of the first ring. The discharge capacity and capacity retention of Ni-NiO/C and Ni/PCNs anode materials during charge-discharge cycle and after 5000 cycles are significantly lower than those of Ni-NiO/PCNs anode materials. Ni-NiO/PCNs anode materials have relatively better cycle stability, which is mainly related to their unique porous three-dimensional lamellar structure.
Sodium ion battery, anode material, annealing, microstructure, electrochemical performance