A Graphene-like Oxygenated Carbon Nitride Material for Improved Cycle-Life Lithium/Sulfur Batteries
Top Cited Papers
- 9 July 2015
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 15 (8), 5137-5142
- https://doi.org/10.1021/acs.nanolett.5b01919
Abstract
Novel sulfur (S) anchoring materials and the corresponding mechanisms for suppressing capacity fading are urgently needed to advance the performance of Li/S batteries. Here, we designed and synthesized a graphene-like oxygenated carbon nitride (OCN) host material that contains tens of micrometer scaled two-dimensional (2D) rippled sheets, micromesopores, and oxygen heteroatoms. N content can reach as high as 20.49 wt %. A sustainable approach of one-step self-supporting solid-state pyrolysis (OSSP) was developed for the low-cost and large-scale production of OCN. The urea in solid sources not only provides self-supporting atmospheres but also produces graphitic carbon nitride (g-C3N4) working as 2D layered templates. The S/OCN cathode can deliver a high specific capacity of 1407.6 mA h g(-1) at C/20 rate with 84% S utilization and retain improved reversible capacity during long-term cycles at high current density. The increasing micropores, graphitic N, ether, and carboxylic O at the large sized OCN sheet favor S utilization and trapping for polysulfides.Keywords
Funding Information
- Inner Mongolia Autonomous Region (NJYT-15-B14)
- Key Laboratory of Nanodevices and Applications (13ZS03)
- Tongliao City (SXYB2012027)
- Natural Science Foundation of Inner Mongolia (2013MS0211, 2013MS0216)
- National Natural Science Foundation of China (21303080, 21303129, 21433013, 21461018)
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