首页|MOF drived MnO/N–C/CNT composite and its modified separator for advanced Li–S battery
MOF drived MnO/N–C/CNT composite and its modified separator for advanced Li–S battery
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NSTL
Elsevier
? 2021The shuttle effect of lithium polysulfides (LPSs) is the main issue which prohibits the practical use of Li–S batteries (LSBs). Therefore, a MnO decorated Nitrogen doped carbon/CNT (MnO/N–C/CNT) composite is synthesized and used as the barrier and accelerator for LPSs. The bi-metal Zn/Mn-MOF is firstly grown on carbon nanotubes (CNT) by a facile chemical reaction of Zn(NO3)2/Mn(NO3) and dimethylimidazole, then the precursor is calcined in nitrogen ambient at 910 °C to fabricate MnO/N–C/CNT composite. After coating on the polypropylene separator, the MnO/N–C/CNT layer can greatly alliviate the shuttle effect by its dual function. The N–C/CNT network can provide good conductivity and physical barrier, while the polar MnO can enhance the chemical adsorption and conversion rate for LPSs. As a result, when the sulfur areal loading is 3.5mg/cm2, an impressive specific capacity of 950 mAh/g at 0.5C is obtained by use of MnO/N–C/CNT modified separator, and it can cycle steadily for over 500 cycles at an average decay rate of 0.022%/cycle. Furthermore, the battery also displays a cycle stability for over 200 cycles even under the sulfur areal loading of 5.5mg/cm2, which demonstrate its application potential.
NSTL
Elsevier
