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Du, Peng,Lu, Jun,Lau, Kah Chun,Luo, Xiangyi,Bareñ,o, Javier,Zhang, Xiaoyi,Ren, Yang,Zhang, Zhengcheng,Curtiss, Larry A.,Sun, Yang-Kook,Amine, Khalil The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.15
<P>The stability of lithium salts, especially in the presence of reduced oxygen species, O<SUB>2</SUB> and H<SUB>2</SUB>O (even in a small amount), plays an important role in the cyclability and capacity of Li–O<SUB>2</SUB> cells. This combined experimental and computational study provides evidence that the stability of the electrolyte used in Li–O<SUB>2</SUB> cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF<SUB>6</SUB>–1NM3 electrolyte, the decomposition of LiPF<SUB>6</SUB> occurs in the cell as evidenced by <I>in situ</I> XRD, FT-IR and XPS analysis, which triggers the decomposition of 1NM3 solvent due to formation of HF from the decomposition of LiPF<SUB>6</SUB>. These reactions lead to degradation of the electrolyte and cause poor cyclability of the cell. The same reactions are not observed when LiTFSI and LiCF<SUB>3</SUB>SO<SUB>3</SUB> are used as the lithium salts in 1NM3 solvent, or LiPF<SUB>6</SUB> is used in TEGDME solvent.</P> <P>Graphic Abstract</P><P>We provided evidence that the stability of the electrolyte used in Li–O<SUB>2</SUB> cells strongly depends on the compatibility of lithium salts with solvent. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp50500f'> </P>
Lei, Yu,Lu, Jun,Luo, Xiangyi,Wu, Tianpin,Du, Peng,Zhang, Xiaoyi,Ren, Yang,Wen, Jianguo,Miller, Dean J.,Miller, Jeffrey T.,Sun, Yang-Kook,Elam, Jeffrey W.,Amine, Khalil American Chemical Society 2013 Nano letters Vol.13 No.9
<P>In this study, atomic layer deposition (ALD) was used to deposit nanostructured palladium on porous carbon as the cathode material for Li–O<SUB>2</SUB> cells. Scanning transmission electron microscopy showed discrete crystalline nanoparticles decorating the surface of the porous carbon support, where the size could be controlled in the range of 2–8 nm and depended on the number of Pd ALD cycles performed. X-ray absorption spectroscopy at the Pd K-edge revealed that the carbon supported Pd existed in a mixed phase of metallic palladium and palladium oxide. The conformality of ALD allowed us to uniformly disperse the Pd catalyst onto the carbon support while preserving the initial porous structure. As a result, the charging and discharging performance of the oxygen cathode in a Li–O<SUB>2</SUB> cell was improved. Our results suggest that ALD is a promising technique for tailoring the surface composition and structure of nanoporous supports in energy storage devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2013/nalefd.2013.13.issue-9/nl401833p/production/images/medium/nl-2013-01833p_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl401833p'>ACS Electronic Supporting Info</A></P>