Abstract
There is a great interest in the utilization of silicon-based anodes for lithium-ion batteries. However, its poor cycling stability, which is caused by a dramatic volume change during lithium-ion intercalation, and intrinsic low electric conductivity hamper its industrial applications. A facile strategy is reported here to fabricate graphene oxide-immobilized NH2-terminated silicon nanoparticles (NPs) negative electrode (Si@NH2/GO) directed by hydrogen bonding and cross-linked interactions to enhance the capacity retention of the anode. The NH2-modified Si NPs first form strong hydrogen bonds and covalent bonds with GO. The Si@NH2/GO composite further forms hydrogen bonds and covalent bonds with sodium alginate, which acts as a binder, to yield a stable composite negative electrode. These two chemical cross-linked/hydrogen bonding interactions - one between NH2- modified Si NPs and GO, and another between the GO and sodium alginate - along with highly mechanically flexible graphene oxide, produced a robust network in the negative electrode system to stabilize the electrode during discharge and charge cycles. The as-prepared Si@NH2/GO electrode exhibits an outstanding capacity retention capability and good rate performance, delivering a reversible capacity of 1000 mAh g-1after 400 cycles at a current of 420 mA g-1with almost 100% capacity retention. The results indicated the importance of system-level strategy for fabricating stable electrodes with improved electrochemical performance.
Original language | English |
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Pages (from-to) | 11277-11285 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 6 |
Issue number | 14 |
DOIs | |
Publication status | Published - 23 Jul 2014 |
Externally published | Yes |
Keywords
- cross-linking
- cycling stability
- graphene oxide
- Li-ion batteries
- Si-based anode
ASJC Scopus subject areas
- Materials Science(all)