Details

Autor(en) / Beteiligte

• Chen, Lin
• Liu, Yuzi
• Ashuri, Maziar
• Liu, Caihong
• Shaw, Leon L.

Titel

Li2S encapsulated by nitrogen-doped carbon for lithium sulfur batteries

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2014-11, Vol.2 (42)

Ort / Verlag

United States: Royal Society of Chemistry

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Using high-energy ball milling of the Li2S plus carbon black mixture followed by carbonization of pyrrole, we have established a facile approach to synthesize Li2S-plus-C composite particles of average size 400 nm, encapsulated by a nitrogen-doped carbon shell. Such an engineered core–shell structure exhibits an ultrahigh initial discharge specific capacity (1029 mAh/g), reaching 88% of the theoretical capacity (1,166 mAh/g of Li2S) and thus offering the highest utilization of Li2S in the cathode among all of the reported works for the encapsulated Li2S cathodes. This Li2S/C composite core with a nitrogen-doped carbon shell can still retain 652 mAh/g after prolonged 100 cycles. These superior properties are attributed to the nitrogen-doped carbon shell that can improve the conductivity to enhance the utilization of Li2S in the cathode. As a result, fine particle sizes and the presence of carbon black within the Li2S core may also play a role in high utilization of Li2S in the cathode.