Journal article
A General Atomic Surface Modification Strategy for Improving Anchoring and Electrocatalysis Behavior of Ti3C2T2 MXene in Lithium–Sulfur Batteries
ACS nano, v 13(10), pp 11078-11086
22 Oct 2019
PMID: 31469546
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Multiple negative factors, including the poor electronic conductivity of sulfur, dissolution and shuttling of lithium polysulfides (Li2S n ), and sluggish decomposition of solid Li2S, seriously hinder practical applications of lithium–sulfur (Li–S) batteries. To solve these problems, a general strategy was proposed for enhancing the electrochemical performance of Li–S batteries using surface-functionalized Ti3C2 MXenes. Functionalized Ti3C2T2 (T = N, O, F, S, and Cl) showed metallic conductivity, as bare Ti3C2. Among all Ti3C2T2 investigated, Ti3C2S2, Ti3C2O2, and Ti3C2N2 offered moderate adsorption strength, which effectively suppressed Li2S n dissolution and shuttling. This Ti3C2T2 exhibited effective electrocatalytic ability for Li2S decomposition. The Li2S decomposition barrier was significantly decreased from 3.390 eV to ∼0.4 eV using Ti3C2S2 and Ti3C2O2, with fast Li+ diffusivity. Based on these results, O- and S-terminated Ti3C2 were suggested as promising host materials for S cathodes. In addition, appropriate functional group vacancies could further promote anchoring and catalytic abilities of Ti3C2T2 to boost the electrochemical performance of Li–S batteries. Moreover, the advantages of a Ti3C2T2 host material could be well retained even at high S loading, suggesting the potential of surface-modified MXene for confining sulfur in Li–S battery cathodes.
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Details
- Title
- A General Atomic Surface Modification Strategy for Improving Anchoring and Electrocatalysis Behavior of Ti3C2T2 MXene in Lithium–Sulfur Batteries
- Creators
- Dashuai Wang - Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)Fei Li - Key Laboratory for UV Light-Emitting Materials and Technology (Ministry of Education)Ruqian Lian - Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)Jing Xu - Department of Physics, College of ScienceDongxiao Kan - Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)Yanhui Liu - Department of Physics, College of ScienceGang Chen - Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)Yury Gogotsi - Drexel UniversityYingjin Wei - Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)
- Publication Details
- ACS nano, v 13(10), pp 11078-11086
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000492801600020
- Scopus ID
- 2-s2.0-85072695371
- Other Identifier
- 991014878139804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology