Improving the Cycle Performance of Porous Schiff-Base Polymer Electrode Materials in Lithium-Ion Batteries by Prelithiation

Organic polymers have been investigated as anode materials of lithium-ion batteries owing to their tunable structure and high capacity. However, the formation of a solid electrolyte interface (SEI) layer in the first circle results in an excessive loss of lithium, leading to poor cycling performance. In this paper, the porous Schiff base polymer (SNW) is prelithiated, and the active lithium is added to the anode material by a redox reaction, which can compensate for the lithium loss caused by SEI film formation. After modification, the specific surface area of the product (SNW@LiH) is reduced and the reversibility is increased, thus improving the cycle performance. For the pristine SNW, the specific capacity decays to 266 mA h g –1 after 1000 cycles at a current density of 1 A g –1; while prelithiated SNW reaches a capacity of 588 mA h g –1 after 1000 cycles. The kinetics and reversibility of the polymer are also analyzed to elucidate the effect of prelithiation treatment on the electrode material, providing for a way to improve the cycling performance and reversibility of the reaction in lithium-ion batteries.