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Title: Low‐Defect and Low‐Porosity Hard Carbon with High Coulombic Efficiency and High Capacity for Practical Sodium Ion Battery Anode

Journal Article · · Advanced Energy Materials
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  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China
  2. College of Chemistry and Molecular Science Hubei Key Laboratory of Electrochemical Power Sources Wuhan University Wuhan 430072 China
  3. Pacific Northwest National Laboratory Richland WA 99352 USA
+ Show Author Affiliations

Abstract Hard carbon is regarded as the most promising anode material for commercialization of Na ion batteries because of its high capacity and low cost. At present, the practical utilization of hard carbon anodes is largely limited by the low initial Coulombic efficiency (ICE). Na ions have been found to adopt an adsorption–insertion storage mechanism. In this paper a systematic way to control the defect concentration and porosity of hard carbon with similar overall architectures is shown. This study elucidates that the defects in the graphite layers are directly related to the ICE as they would trap Na ions and create a repulsive electric field for other Na ions so as to shorten the low‐voltage intercalation capacity. The obtained low defect and porosity hard carbon electrode has achieved the highest ICE of 86.1% (94.5% for pure hard carbon material by subtracting that of the conductive carbon black), reversible capacity of 361 mA h g −1 , and excellent cycle stability (93.4% of capacity retention over 100 cycles). This result sheds light on feasible design principles for high performance Na storage hard carbon: suitable carbon layer distance and defect free graphitic layers.

Sponsoring Organization:
USDOE
Grant/Contract Number:
KC020105‐FWP12152
OSTI ID:
1429526
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 8 Journal Issue: 20; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 337 works
Citation information provided by
Web of Science

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