基于离子凝胶电解质的高稳定锌离子电池.

Zn-ion batteries have attracted much attention due to their high safety and low cost, however, the growth of Zn dendrites hinders the stability of the battery performance. Here, a strategy is proposed to prepare ionogel electrolytes by incorporating ionic liquids into PVDF-HFP substrate. The cations of the ionic liquids can adsorb onto the Zn tips to form a shielding layer for uniform deposition of Zn2+. In this work, EMIM (OTf), BMIM (OTf), and HMIM (OTf), that belong to imidazolium ionic liquids, were selected to investigate the inhibitory effect of their cation with different side chain length on the growth of Zn dendrite. It was demonstrated that the ionogel electrolyte, prepared from BMIM (OTf) with moderate side chain length, not only suppressed the growth of Zn dendrites effectively and had high ionic conductivity of 1.87 mS/cm, but also had a stable cycle life of 2500 h. The Coulombic efficiency reached 99.30% after 500 cycles and the capacity retention of the full battery was 83.9% after 200 cycles. This work demonstrates the potential application of ionogel electrolytes in the field of high-performance Zn-ion batteries. [ABSTRACT FROM AUTHOR]