在聚丙烯隔膜上修饰二氧化硅纳米颗粒用于锂硫电池。
Decoration of Silica Nanoparticles on Polypropylene Separator for Lithium-Sulfur Batteries.
机构信息
Key Laboratory of Energy Materials Chemistry, Ministry of Education; Key Laboratory of Advanced Functional Materials, Autonomous Region; Institute of Applied Chemistry, Xinjiang University , Urumqi, 830046 Xinjiang, People's Republic of China.
Tianjin EV Energies Co., Ltd. , Tianjin, 300380 Tianjin, People's Republic of China.
出版信息
ACS Appl Mater Interfaces. 2017 Mar 1;9(8):7499-7504. doi: 10.1021/acsami.7b00065. Epub 2017 Feb 20.
A SiO nanoparticle decorated polypropylene (PP) separator (PP-SiO) has been prepared by simply immersing the PP separator in the hydrolysis solution of tetraethyl orthosilicate (TEOS) with the assistance of Tween-80. After decoration, the thermal stability and the electrolyte wettability of the PP-SiO separator are obviously improved. When the PP-SiO separator is used for lithium-sulfur (Li-S) batteries, the cyclic stability and rate capability of the batteries are greatly enhanced. The capacity retention ratio of the Li-S battery configured with the PP-SiO separator is 64% after 200 cycles at 0.2 C, which is much higher than that configured with the PP separator (45%). Moreover, the rate capacity of the Li-S batteries using the PP-SiO separator reaches 956.3, 691.5, 621, and 567.6 mAh g at the current density of 0.2, 0.5, 1, and 2 C, respectively. The reason could be ascribed to that the polar silica coating not only alleviates the shuttle effect but also facilitates Li-ion migration.
一种 SiO 纳米粒子修饰的聚丙烯（PP）隔膜（PP-SiO）是通过简单地将 PP 隔膜浸入正硅酸乙酯（TEOS）的水解溶液中，并在 Tween-80 的辅助下制备的。修饰后，PP-SiO 隔膜的热稳定性和电解液润湿性明显提高。当将 PP-SiO 隔膜用于锂硫（Li-S）电池时，电池的循环稳定性和倍率性能得到了极大的提高。在 0.2 C 的电流密度下循环 200 次后，配置有 PP-SiO 隔膜的 Li-S 电池的容量保持率为 64%，远高于配置有 PP 隔膜的电池（45%）。此外，使用 PP-SiO 隔膜的 Li-S 电池的倍率容量分别为在 0.2、0.5、1 和 2 C 的电流密度下达到 956.3、691.5、621 和 567.6 mAh g。原因可能是极性二氧化硅涂层不仅减轻了穿梭效应，而且有利于锂离子迁移。
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