Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 13, Pages 4361-4365Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900005
Keywords
carbon anode; high safety; Na-ion batteries; rate capability; slope-dominated
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Funding
- National Key Technologies R&D Program, China [2016YFB0901500]
- National Natural Science Foundation of China [51725206, 51421002]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070500]
- Beijing Municipal Science and Technology Commission [Z181100004718008]
- Beijing Natural Science Fund-Haidian Original Innovation Joint Fund [L182056]
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The comprehensive performance of carbon anodes for Na-ion batteries (NIBs) is largely restricted by their inferior rate capability and safety issues. Herein, a slope-dominated carbon anode is achieved at a low temperature of 800 degrees C, which delivers a high reversible capacity of 263mAhg(-1) at 0.15C with an impressive initial Coulombic efficiency (ICE) of 80%. When paired with the NaNi1/3Fe1/3Mn1/3O2 cathode, the reversible capacity at 6C is still 75% of that at 0.15C, and 73% of the capacity is retained after 1000 cycles at 3C. The enhanced Na storage performance could be attributed to the unique microstructure with randomly oriented short carbon layers and the relatively higher defect concentration. Given its robustness, such a low-temperature carbonization strategy could also be applicable to other precursors and provide a new opportunity to design slope-dominated carbon anodes for high safety, low-cost NIBs with excellent ICE and superior rate capability.
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