Hierarchically porous nitrogen-doped graphene frameworks (N-GFs) are fabricated through the ice-templating of GO with polyethylenimine and the thermal treatment of the resultant hybrids. As cathode materials in lithium ion batteries (LIBs), the obtained N-GFs exhibit an outstanding specific capacity of 379 mA h g−1 at 0.5 A g−1 for 2500 cycles. Even at an ultrahigh current density of 5 A g−1, the N-GFs maintain a capacity of 94 mA h g−1, superior to that of most reported LIB cathode materials. The experimental results and quantum mechanics calculations suggest that pyridinic-like N and pyridinic N-oxide in graphene are responsible for the excellent cathodic performance of the bipolar N-GFs by providing fast surface faradaic reactions with both p- and n-doped states.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:30349 |
| Date | 17 July 2017 |
| Creators | Huang, Yanshan, Wu, Dongqing, Dianat, Arezoo, Bobeth, Manferd, Huang, Tao, Mai, Yiyong, Zhang, Fan, Cuniberti, Gianaurelio, Feng, Xinliang |
| Publisher | Royal Society of Chemistry |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 10.1039/C6TA09161J |
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