In Situ EQCM Study Examining Irreversible Changes the Sulfur鈥揅arbon Cathode in Lithium鈥揝ulfur Batteries

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• 作者：Heng-Liang Wu ; Laura A. Huff ; Jennifer L. Esbenshade ; Andrew A. Gewirth
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：7
• 期：37
• 页码：20820-20828
• 全文大小：484K
• ISSN：1944-8252

文摘

In situ EQCM experiments were used to investigate the stability and roughness changes occurring in a sulfur鈥揷arbon cathode utilized for a Li鈥揝 battery during the charge鈥揹ischarge process. Results show that the sulfur鈥揷arbon cathode gains mass during the first discharge plateau (鈭?.4 V) due to the formation of the long chain polysulfides during the discharge (lithiation) process. However, further discharge to below 2.4 V yields an increase in the crystal resistance (R_c) suggesting the sulfur鈥揷arbon cathode becomes rougher. During the charge (delithiation) process, the roughness of the sulfur鈥揷arbon cathode decreases. Time dependent measurements show that the electrode surface becomes rougher with the deeper discharge, with the change occurring following a step to 1.5 V. The sulfur鈥揷arbon cathode exhibits stable R_c and frequency behavior initially, but then becomes rougher in subsequent following cycles.