Infiltrating sulfur in hierarchical architecture MWCNT@meso C core–shell nanocomposites for lithium–sulfur batteries

文献情報

出版日 2013-04-12

DOI 10.1039/C3CP51551F

インパクトファクター 3.676

著者

Yingchao Yu, Weidong Zhou, Hao Chen, Francis J. DiSalvo, Héctor D. Abruña

原文を見る

要旨

We present hierarchical architecture MWCNT (multi-walled carbon nanotubes)@meso C core–shell nanostructures as a carbon matrix for effective trapping of sulfur/polysulfides as a cathode material for Li–S batteries. The unique structure of MWCNT@meso C core–shell nanocomposites was achieved by using a sol–gel coating method followed by nanocasting. By infiltrating sulfur into the matrix, S/MWCNT@meso C core–shell nanocomposites were achieved. This material exhibited an initial discharge capacity of 1248 mA h g−1 although it decayed to about 640 mA h g−1 after 50 cycles. However, this performance is much better than that of S directly deposited on MWCNT (S/MWCNT) which only retained a capacity of 120 mA h g−1 after 50 cycles. Our composite exhibited excellent rate capability even at a discharge current density of 2 A g−1. The improvement in electrochemical performance is attributed to the synergetic effect between MWCNT cores, which provide electronic conduction pathways, and the mesoporous carbon shells with a relatively high surface area, which can trap sulfur/polysulfides and provide Li+ ion pathways.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.