Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 17, Pages 8039-8046Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00010g
Keywords
-
Funding
- National Natural Science Foundation of China [51671003]
- National Key Research and Development Program of China [2016YFB0100201]
- Open Project Foundation of State Key Laboratory of Chemical Resource Engineering
- Young Thousand Talents Program
- Peking University
Ask authors/readers for more resources
Silicon (Si) is a promising anode candidate for lithium-ion batteries (LIBs) owing to its unprecedented theoretical capacity of 4200 mA h g(-1) and earth-abundant supply (26.2 wt%). Nevertheless, the huge volume expansion and unstable solid-electrolyte interface (SEI) of Si in multiple cycles make it very hard to simultaneously achieve high-energy and long-term cycle life for applications in large-scale renewable energy storage. Herein, we demonstrate a new class of Si/SiOx@void@nitrogen-doped carbon double-shelled hollow superstructure (Si/SiOx-DSHS) electrodes that are capable of accommodating huge volume changes without pulverization during cycling. Benefiting from the unique double-shelled hollow superstructure, Si/SiOx-DSHSs can facilitate the formation of a highly stable SEI layer and provide superior kinetics toward Li+-ion storage. The diffusion-controlled process and the capacitance-type reaction can work together to endow Si/SiOx-DSHSs with remarkable electrochemical characteristics, especially at high current density. These important characteristics make Si/SiOx-DSHSs deliver a large reversible capacity (1290 mA h g(-1) at 0.1C), high first-cycle coulombic efficiency (71.7%), superior rate capability (360 mA h g(-1) at 10C), and excellent cycling behavior up to 1000 cycles with a small capacity decay of 10.2%. The Si/SiOx-DSHSs are among the best Si-based anode materials for LIBs reported to date.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available