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Supporting data for "Cellulose separators with integrated carbon nanotube interlayers for lithium-sulfur batteries: an investigation into the complex interplay between cell components"

Yu-Chuan Chien; Ruijun Pan; Ming-Tao Lee; Leif Nyholm; Daniel Brandell; Matthew J. Lacey


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    <subfield code="a">Supporting data for "Cellulose separators with integrated carbon nanotube interlayers for lithium-sulfur batteries: an investigation into the complex interplay between cell components"</subfield>
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    <subfield code="a">&lt;p&gt;This is the dataset of electrochemical experiments for our publication &amp;quot;Cellulose separators with integrated carbon nanotube interlayers for lithium-sulfur batteries: an investigation into the complex interplay between cell components&amp;quot;. This archive contains the raw data and scripts written in R used in the analysis and presentation of the results in this manuscript.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Abstract for the manuscript:&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;This work aims to address two major roadblocks in the development of lithium-sulfur (Li-S) batteries: the inefficient deposition of Li on the metallic Li electrode and the parasitic &amp;ldquo;polysulfide redox shuttle&amp;rdquo;. These roadblocks are here approached, respectively, by the combination of a cellulose separator with a cathode-facing conductive porous carbon interlayer, based on their previously reported individual benefits. The cellulose separator increases cycle life by 33%, and the interlayer by a further 25%, in test cells with positive electrodes with practically relevant specifications and a relatively low electrolyte/sulfur (E/S) ratio. Despite the prolonged cycle life, the combination of the interlayer and cellulose separator &lt;em&gt;increases&lt;/em&gt; the polysulfide shuttle current, leading to reduced Coulombic efficiency. Based on XPS analyses, the latter is ascribed to a change in the composition of the solid electrolyte interphase (SEI) on Li. Meanwhile, electrolyte decomposition is found to be slower in cells with cellulose-based separators, which explains their longer cycle life. These counterintuitive observations demonstrate the complicated interactions between the cell components in the Li-S system and how strategies aiming to mitigate one unwanted process may exacerbate another. This study demonstrates the value of a holistic approach to the development of Li-S chemistry.&lt;/p&gt;

&lt;p&gt;Manuscript preprint &lt;a href="http://dx.doi.org/10.26434/chemrxiv.8835728"&gt;available at ChemRxiv&lt;/a&gt; (pending approval as of 9/7/19).&lt;/p&gt;</subfield>
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