Stabilizing lithium–sulphur cathodes using polysulphide reservoirs
- 24 May 2011
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 2 (1), 325
- https://doi.org/10.1038/ncomms1293
Abstract
The possibility of achieving high-energy, long-life storage batteries has tremendous scientific and technological significance. An example is the Li–S cell, which can offer a 3–5-fold increase in energy density compared with conventional Li-ion cells, at lower cost. Despite significant advances, there are challenges to its wide-scale implementation, which include dissolution of intermediate polysulphide reaction species into the electrolyte. Here we report a new concept to mitigate the problem, which relies on the design principles of drug delivery. Our strategy employs absorption of the intermediate polysulphides by a porous silica embedded within the carbon–sulphur composite that not only absorbs the polysulphides by means of weak binding, but also permits reversible desorption and release. It functions as an internal polysulphide reservoir during the reversible electrochemical process to give rise to long-term stabilization and improved coulombic efficiency. The reservoir mechanism is general and applicable to Li/S cathodes of any nature.This publication has 23 references indexed in Scilit:
- Enhancement of long stability of sulfur cathode by encapsulating sulfur into micropores of carbon spheresEnergy & Environmental Science, 2010
- Cutting Gallium Oxide Nanoribbons into Ultrathin NanoplatesChemistry of Materials, 2009
- Colloidal Silica Templating Synthesis of Carbonaceous Monoliths Assuring Formation of Uniform Spherical Mesopores and Incorporation of Inorganic NanoparticlesChemistry of Materials, 2007
- Effects of Nanosized Adsorbing Material on Electrochemical Properties of Sulfur Cathodes for Li/S Secondary BatteriesJournal of the Electrochemical Society, 2004
- Metal Oxides as Negative Electrode Materials in Li-Ion CellsElectrochemical and Solid-State Letters, 2002
- Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 Angstrom PoresScience, 1998
- Rechargeable lithiumsulfur battery (extended abstract)Journal of Power Sources, 1989
- Effect of Sulfur Impurities on Li / TiS2 CellsJournal of the Electrochemical Society, 1981
- A Lithium/Dissolved Sulfur Battery with an Organic ElectrolyteJournal of the Electrochemical Society, 1979
- Formation of lithium polysulfides in aprotic mediaJournal of Inorganic and Nuclear Chemistry, 1977