Effects of current collectors on power performance of Li 4Ti 5O 12 anode for Li-ion battery
Journal
Journal of Power Sources
Journal Volume
197
Pages
301-304
Date Issued
2012
Abstract
The effects of current collector on the charge/discharge capacity and cycle stability of Li 4Ti 5O 12 (LTO) electrode under high C-rates (up to 20 C) have been investigated by applying five types of current collectors, including a Al foil, an anodization-etched Al (E-Al), the same etched Al with a conformal C coating (C-E-Al), a Cu foil (Cu) and the same Cu foil with a C coating (C-Cu). The C coatings on both metal current collectors are deposited by a chemical vapor deposition process using CH 4 at 600 ¢XC. The capacities of the LTO electrodes above 1 C rate are in the order of Al < E-Al < Cu ? C-E-Al < C-Cu, exhibiting remarkable enhancement in rate performance by the C-coating for both metals. Surface analyses indicate that the enhancement can be attributed to the combination of two factors, including removal of the native oxide layer and modification of surface hydrophobicity, which improves adhesion of active layer, on the current collector surface. Both contribute to the reduction of the resistance at the current-collector/active layer interface. All electrodes show good cycle stability. ? 2011 Elsevier B.V. All rights reserved.
Subjects
Aluminum
Carbon coating
Copper
Current collector
Lithium titanate anode
Lithium-ion battery
SDGs
Other Subjects
Active Layer; Al foil; Carbon coating; Charge/discharge; Chemical vapor deposition process; Cu foil; Current collector; Cycle stability; Layer interfaces; Li-ion batteries; Lithium titanate anode; Lithium-ion battery; Native oxide layer; Power performance; Rate performance; Surface hydrophobicity; Aluminum; Aluminum coatings; Aluminum foil; Chemical vapor deposition; Coatings; Electric current collectors; Electrodes; Lithium; Metal cladding; Secondary batteries; Power quality
Type
journal article