Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 18, Pages 4573-4582Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201704590
Keywords
cathode material; encapsulating structure; Li-S batteries; N-doped carbon; nanoconfined oxidation
Categories
Funding
- National Natural Science Foundation of China [51771076]
- Innovative Research Groups of the National Natural Science Foundation of China [NSFC51621001]
- 1000 plan from Chinese Government
- Training Program of the Major Basic Research Project of the Natural Science Foundation of Guangdong Province [2017B030308001]
- Project of Public Interest Research and Capacity Building of Guangdong Province [2017A010104004]
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The sulfur cathode, as a new generation of lithium-ion battery cathode material, has a high theoretical energy density of about 2500Whkg(-1). However, the low conductivity of sulfur and the shuttle effect, widely presenting in the lithiation/de-lithiation process, seriously hinder its practical application. Here, we report a new nanoconfined oxidation route (first complete oxidation of metal sulfide and subsequently partial oxidation of the generated S from sulfide) for S cathode encapsulated with MnO2 nanosheets and N-doped carbon hollow spheres. This nanoconfined oxidation route can successfully confine the sulfur particles in the interior of the carbon shell, and the rationally introduced nonpolar carbon and polar MnO2 can both reduce the dissolution of polysulfide during the charge-discharge process. The obtained well-defined S-MnO2@C cathode exhibits high specific capacity with excellent cycling performance and superior rate capability.
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