MXene based self-assembled cathode and antifouling separator for high-rate and dendrite-inhibited Li–S battery
| Autor: | Mohammed N. Hedhili, Lain-Jong Li, Dong Guo, Husam N. Alshareef, Yangxing Li, Hang Su, Fangwang Ming, Mengliu Li, Zhiping Lai, Wandi Wahyudi, Yingqiang Wu, Guan Sheng |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment chemistry.chemical_element Ionic bonding Lithium–sulfur battery 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur Cathode 0104 chemical sciences law.invention Biofouling chemistry.chemical_compound chemistry Chemical engineering law General Materials Science Electrical and Electronic Engineering 0210 nano-technology Porosity Polysulfide Separator (electricity) |
| Zdroj: | Nano Energy. 61:478-485 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2019.05.011 |
| Popis: | We demonstrate a novel strategy to enhance sulfur loading and rate performance for Li–S battery by synchronously coupling a nanostructured cathode with an antifouling separator via a facile electrostatic self-assembly approach. The assembly of two dimensional (2D) MXene and positively charged 1D CNT-Polyethyleneimine was observed to controllably address the key issues of sluggish ionic transport, and produce an integrate cathode with dynamic crosslinking network. Moreover, an antifouling separator is proposed by this strategy for the first time, which features well-organized inter-lamellar porosity, dual polarity and high conductivity. The antifouling separator is found to play a pivotal role in: 1) low-order polysulfide activation, 2) high rate cyclability, and 3) Li dendrites inhibition. Our integrated design realizes a long-term capacity of 980 mAh g−1 at 5 mA cm−2 over 500 cycles (sulfur loading: 2.6 mg cm−2). Furthermore, a flexible self-assembled cathode with high loading (5.8 mg cm−2) and superb mechanical strength (13 MPa), demonstrates an appealing areal capacity of 7.1 mAh cm−2 and rate performance at nearly 10 mA cm−2. |
| Databáze: | OpenAIRE |
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