A Bioinspired Functionalization of Polypropylene Separator for Lithium-Sulfur Battery
A Bioinspired Functionalization of Polypropylene Separator for Lithium-Sulfur Battery
复制标题
锂硫电池聚丙烯隔膜的仿生功能化
DOI：
10.3390/polym11040728
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发表时间：
2019-04-01
期刊：
影响因子：
5
通讯作者：
Li, Junsheng
中科院分区：
文献类型：
--
作者：
Zhang, Zhijia;Li, Xuequan;Li, Junsheng
锂硫电池由于比容量高而受到广泛关注，但可溶性多硫化物的穿梭效应导致容量下降。针对这个问题，我们开发了一种新型单宁酸和金纳米颗粒功能化隔膜。通过两步溶液工艺将单宁酸和金纳米颗粒改性到商用聚丙烯隔膜上。由于改性层中含有大量的酚羟基和金纳米粒子的强极性，电池循环过程中产生的可溶性多硫化物很好地稳定在正极侧，减缓了穿梭效应带来的容量衰减。此外，该改性有效提高了隔膜的电解质亲和力。由于这些优点，与原始聚丙烯隔膜相比，新型隔膜表现出改进的电池性能。
Lithium-sulfur batteries have received intensive attention, due to their high specific capacity, but the shuttle effect of soluble polysulfide results in a decrease in capacity. In response to this issue, we develop a novel tannic acid and Au nanoparticle functionalized separator. The tannic acid and gold nanoparticles were modified onto commercial polypropylene separator through a two-step solution process. Due to a large number of phenolic hydroxyl groups contained in the modified layer and the strong polarity of the gold nanoparticles, the soluble polysulfide generated during battery cycling is well stabilized on the cathode side, slowing down the capacity fade brought by the shuttle effect. In addition, the modification effectively improves the electrolyte affinity of the separator. As a result of these benefits, the novel separator exhibits improved battery performance compared to the pristine polypropylene separator.