Al2O3-coated porous separator for enhanced electrochemical performance of lithium sulfur batteries
2014; Elsevier BV; Volume: 129; Linguagem: Inglês
10.1016/j.electacta.2014.02.077
ISSN1873-3859
AutoresZhiyong Zhang, Yanqing Lai, Zhian Zhang, Kai Zhang, Jie Li,
Tópico(s)Advanced battery technologies research
ResumoIn this paper, Al2O3-coated separator with developed porous channels is prepared to improve the electrochemical performance of lithium sulfur batteries. It is demonstrated that the Al2O3-coating layer is quite effective in reducing shuttle effect and enhancing the stability of the sulfur electrode. The initial discharge capacity of the cell with Al2O3-coated separator can reach 967 mAh g−1 at the rate of 0.2 C. After 50th charge/discharge cycle, this cell can also deliver a reversible capacity of as high as 593.4 mAh g−1. Significantly, the charge-transfer resistance of the electrode tends to be reducing after using Al2O3-coated separator. The improved cell performance is attributed to the porous architecture of the Al2O3-coating layer, which serves as an ion-conducting skeleton for trapping and depositing dissolved sulfur-containing active materials, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).
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