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Title: Molten-NaNH 2 Densified Graphene with In-Plane Nanopores and N-Doping for Compact Capacitive Energy Storage

Journal Article · · Advanced Energy Materials
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Wuhan Univ. (China). College of Chemistry and Molecular Sciences, Hubei Key Lab. of Electrochemical Power
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division

Capacitive carbons are attractive for energy storage on account of their superior rate and cycling performance over traditional battery materials, but they usually suffer from a far lower volumetric energy density. Starting with expanded graphene, a simple, multifunctional molten sodium amide treatment for the preparation of high-density graphene with high capacitive performance in both aqueous and lithium battery electrolytes is reported. The molten sodium amide can condense the expanded graphene, lead to nitrogen doping and, what is more important, create moderate in-plane nanopores on graphene to serve as ion access shortcuts in dense graphene stacks. Finally, the resulting high-density graphene electrode can deliver a volumetric capacitance of 522 F cm-3 in a potassium hydroxide electrolyte; and in a lithium-ion battery electrolyte, it exhibits a gravimetric and volumetric energy density of 618 W h kg-1 and 740 W h L-1, respectively, and even outperforms commercial LiFePO4.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1494891
Alternate ID(s):
OSTI ID: 1400632
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 20 Vol. 7; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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