期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 1, 页码 391-397出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12542
关键词
hard carbon; high-temperature carbonization; biomass material; sodium ion battery; long cycling
资金
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0001160]
Hard carbon is currently considered the most promising anode candidate for room-temperature sodium ion batteries because of its relatiyely high capacity, low cost, and good scalability. In this work, switchgrass as a biomass example was carbonized under an ultrahigh temperature, 2050 degrees C, induced by Joule heating to create hard carbon anodes for sodium ion batteries. Switchgrass derived carbon materials intrinsically inherit its three-dimensional porous hierarchical architecture, with an average interlayer spacing-of 0.376 nm. The larger interlayer spacing than that of graphite allows for the significant Na ion storage performance. Compared to the sample carbonized under 1000 degrees C, switchgrass derived carbon at 2050 degrees C induced an improved initial Coulombic efficiency. Additionally, excellent rate capability and superior cycling performance are demonstrated for the switchgrass derived carbon due to the unique high temperature treatment.
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