Sulfur-Infiltrated Micro- and Mesoporous Silicon Carbide-Derived Carbon Cathode for High-Performance Lithium Sulfur Batteries

Title
Sulfur-Infiltrated Micro- and Mesoporous Silicon Carbide-Derived Carbon Cathode for High-Performance Lithium Sulfur Batteries
Authors
Jung Tae LeeYouyang ZhaoSoren ThiemeHyea KimMartin OschatzLars BorchardtAlexandre Magasinski조원일Stefan KaskelGleb Yushin
Keywords
Li-S battery; carbide-derived carbon; cathode; nanocomposites; SiC driven Carbon; confinement; small pore size; dissolution; polysulfide
Issue Date
2013-09
Publisher
Advanced materials
Citation
VOL 25, NO 33, 4573-4579
Abstract
Lithium ion batteries (LiBs) are commercially successful and widely used in various portable electronic devices as well as automobiles. However, the needs for high energy and power density with longer cycle life cannot be fulfi lled by the current state-of-art LiBs. It is inevitable to explore alternative electrode materials with higher gravimetric and volumetric capacities.[1,2] Sulfur (S) is considered to be one of the most probable candidates for the next generation cathodes due to its high theoretical gravimetric capacity of 1672 mA h g−1 , low cost and its abundance in nature.[3,4–10] Although this capacity is an order of magnitude higher than that of existing commercial electrode materials, S cathodes still have several challenges to be overcome for commercialization. The key problems include dissolution of polysulfi des (the reaction intermediates during discharge such as Li2S8 or Li2S4) and precipitation of electrically insulating Li2S2 and/or Li2S onto the surface of both electrodes. [6,11] Both phenomena restrict the cell performance by lowering the active mass and increasing cell resistance during prolonged operation. The dissolution and re-precipitation of polysulfi des (shuttle mechanism) additionally results in overcharge and low Coulombic effi ciency.[5,6]
URI
http://pubs.kist.re.kr/handle/201004/46090
ISSN
09359648
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