One Step Annealing Treatment for Performance Improvement of Silicon Anode Based on Polyimide Binder

Li-ion batteries have many industrial applications. We report a one step annealing treatment of the silicon anode for Li-ion battery to improve the electrochemical performance and stability. We have used a polyimide (PI) with high mechanical strength and excellent thermal stability as a polymeric binder to get better performance. The physical properties of the PI binder improved the surface morphology, lithiation and delithiation process. The Si anode shows a high initial charge reversible capacity of 1195.6 mAh g-1 and charge capacity retention of 93.6% for 30 cycles. Based on image, cyclic voltammetry, electrochemical impedance spectroscopy and SEM image, we conclude that the annealed anode has much better charge reversible capacity in comparison to the non-annealed anode. These improvements are attributed to the compact surface morphology of the silicon electrode reconstructed by the PI binder and annealing treatment. The annealing temperature plays an important role to improve the performance of Si anode.