SJTU group develops fumed alumina gel-like electrolyte to spice up efficiency of Li-S batteries

Researchers at Shanghai Jiao Tong College have developed a gel-like electrolyte induced by fumed alumina for dendrite-free Li deposition, decrease over-potential and higher cycle stability in lithium-sulfur batteries. An open-access paper on their work is revealed within the RSC journal Chemical Communications.

The Li-S@pPAN cells with the proposed electrolyte exhibit excellent cycle stability and fee efficiency with capability retentions of 95.1% after 300 cycles and 76.5% at 10C towards 1C respectively.

As well as, the gel-like electrolyte endows the cell with a possible benefit as to questions of safety reminiscent of liquid leakage and short-circuit induced by lithium dendrites.

In contrast with the state-of-the-art Li-ion batteries, lithium- sulfur (Li-S) battery possesses remarkably greater theoretical particular capability of 1675 mAh g-1 and particular power density of 2600 Wh kg-1, considered probably the most promising candidate for the subsequent era of lithium batteries. Nonetheless, there have been a number of essential technical points hindering its sensible software. The expansion of the Li dendrites not solely decays the efficiency of batteries but in addition results in potential security hazard. Alternatively, because the strong electrolyte interphase (SEI) shaped by the slight response with natural electrolyte is much less steady, the breakage and regeneration of the SEI are sometimes inevitable throughout biking, additional ensuing within the low Coulombic effectivity and speedy capability fading. Therefore, it's essential to handle these points previous to its large-scale commercialization.

… As we all know, alumina has been utilized as filler in polymer electrolytes to extend general conductivity and reduce the crystallization like silica filler. What's extra, fumed alumina, like different ceramic fillers, is ready to scavenge impurities reminiscent of O2 and H2O. Herein, fumed alumina nanoparticles are chosen for the primary time to arrange a gel-like carbonate electrolyte (LiPF6/EC-DMC) utilized in Li-S@pPAN cells. The considerably improved electrochemical efficiency is achieved and the operate mechanism is revealed.

—Lei et al.

Sources

  • Bin Lei, Jun Yang, Zhixin Xu, Shasha Su, Dong Wang, Jinhua Jiang and Jing Feng (2018) “Fumed alumina induced gel-like electrolyte for nice efficiency enchancment of lithium-sulfur battery” Chem. Commun. doi: 10.1039/C8CC07741J