高稳定性锌复合负极的合成与电化学性能

Synthesis and electrochemical characterization of high stability composite zinc anode

在金属锌表面采用原位流延的方式制备高稳定性氧化铝-锌复合负极,是一种具有骨架结构和更大比表面积的三维电极。这种结构可以分散锌沉积/溶解时的电流密度,抑制枝晶生长。采用该复合负极组装对称电池稳定循环500h,过电势仅为19 mV。该复合负极与锰酸锂正极组装的全电池具有更好的循环性能和倍率性能,经过200次循环后未发生短路,比容量平稳保持在81 mAh/g,容量保持率为99.85%。

The alumina-zinc composite anode with high stability was prepared by designing zinc metal surface and using in-situ casting, and the proposed alumina-zinc composite negative electrode was a three-dimensional electrode with a framework structure and a larger specific surface area. In the zinc deposition/dissolution process, this structure can not only disperse the current density and achieve a stable electrochemical cycle, but also can play a role in inhibiting dendritic growth. The symmetrical battery assembled by the composite negative electrode cycles stably for 500 h, and the average over-potential is only 19 mV. Moreover, the full cells using the alumina-zinc composite anode and LiMn2O4 electrode has better cycle performance and rate performance;after 200 cycles, short circuit does not occur;the specific capacity remains stable at 81 mAh/g and capacity retention rate is 99.85%.