Amphiphilic Surface Modification of Hollow Carbon Nanofibers for Improved Cycle Life of Lithium Sulfur Batteries
- 14 February 2013
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 13 (3), 1265-1270
- https://doi.org/10.1021/nl304795g
Abstract
Tremendous effort has been put into developing viable lithium sulfur batteries, due to their high specific energy and relatively low cost. Despite recent progress in addressing the various problems of sulfur cathodes, lithium sulfur batteries still exhibit significant capacity decay over cycling. Herein, we identify a new capacity fading mechanism of the sulfur cathodes, relating to LixS detachment from the carbon surface during the discharge process. This observation is confirmed by ex-situ transmission electron microscopy study and first-principles calculations. We demonstrate that this capacity fading mechanism can be overcome by introducing amphiphilic polymers to modify the carbon surface, rendering strong interactions between the nonpolar carbon and the polar LixS clusters. The modified sulfur cathode show excellent cycling performance with specific capacity close to 1180 mAh/g at C/5 current rate. Capacity retention of 80% is achieved over 300 cycles at C/2.Keywords
This publication has 31 references indexed in Scilit:
- Nanostructured sulfur cathodesChemical Society Reviews, 2013
- An Advanced Lithium‐Sulfur BatteryAdvanced Functional Materials, 2012
- Spherical Ordered Mesoporous Carbon Nanoparticles with High Porosity for Lithium–Sulfur BatteriesAngewandte Chemie-International Edition, 2012
- Li–O2 and Li–S batteries with high energy storageNature Materials, 2011
- Porous Hollow Carbon@Sulfur Composites for High‐Power Lithium–Sulfur BatteriesAngewandte Chemie, 2011
- Advances in Li–S batteriesJournal of Materials Chemistry, 2010
- New Nanostructured Li2S/Silicon Rechargeable Battery with High Specific EnergyNano Letters, 2010
- A highly ordered nanostructured carbon–sulphur cathode for lithium–sulphur batteriesNature Materials, 2009
- Polysulfide Shuttle Study in the Li/S Battery SystemJournal of the Electrochemical Society, 2004
- Issues and challenges facing rechargeable lithium batteriesNature, 2001