TUNING SILICON NANORODS FOR ANODES OF LI-ION RECHARGEABLE BATTERIES

Journal Article · Tue Nov 23 04:00:00 EST 2010 · Electrochemical Society Transactions

OSTI ID:1006406

Au, M

Silicon is a promising anode material for Li-ion batteries in regarding of high capacity, low cost and safety, but it suffers poor cycling stability due to the pulverization induced by severe volume expansion/shrinkage (297%) during lithium insertion/extraction. In our previous investigation on aluminum nanorods anodes, it is found the selection of substrates in which Al nanorods grown plays the role in prevention of pulverization resulting in the increase of cycling life. Adapting this knowledge, we investigated the Si based nanorods anodes by tuning its composition and element distribution. Our results show that although the Si nanorods demonstrated higher initial anodic capacity of 1500 mAh/g, it diminished after 50 cycles due to morphology change and pulverization. By codepositing Cu, the Si-Cu composite nanorods demonstrated sustainable capacity of 500 mAh/g in 100 cycles attributing to its flexible and less brittle nature.

• Research Organization: SRS
• Sponsoring Organization: DOE
• DOE Contract Number: AC09-08SR22470
• OSTI ID: 1006406
• Report Number(s): SRNL-STI-2010-00747
• Journal Information: Electrochemical Society Transactions, Journal Name: Electrochemical Society Transactions
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALUMINIUM
ANODES
CAPACITY
COMMINUTION
DISTRIBUTION
LITHIUM
MORPHOLOGY
SAFETY
SILICON
STABILITY
SUBSTRATES
TUNING