Fabrication of binder-free SnO(2) nanoparticle electrode for lithium secondary batteries by electrophoretic deposition method

• Published in: Electrochimica acta Vol. 76; pp. 383 - 388
• Main Authors: Ui, Koichi, Kawamura, Soshi, Kumagai, Naoaki
• Format: Journal Article
• Language: English
• Published: 01.08.2012
• Subjects: Deposition; Discharge; Electrodes; Electrophoretic deposition; Nanocomposites; Nanomaterials; Nanostructure; Storage batteries
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2012.05.048

We tried fabricating a binder-free co-deposited film electrode consisting of SnO(2) nanoparticles (nano-SnO(2)) and acetylene black (AB) particles by an electrophoretic deposition (EPD) method. By cathodically depositing on a copper foil when employing an acetone bath, the co-deposited film consisting of nano-SnO(2) and AB could be fabricated. SEM/EDX indicated that the roughness of the co-deposited film was approximately 1 mu m and the nano-SnO(2) particles and the AB particles were uniformly deposited. The weight percent of the nano-SnO(2) in the co-deposited film could be controlled in the range from 87.80 to 93.64wt.%. The galvanostatic charge-discharge tests indicated that the discharge capacity and the charge-discharge efficiency of the co-deposited film (nano-SnO(2):AB=93.64:6.36wt.%) at the 1st cycle were 887 mAhg(-1) and 48.8% at 0.1C, respectively; the discharge capacity after the 50th cycle was 504mAhg(-1). It has been considered that the reverse reaction of the conversion reaction would occur during discharging because the discharge capacity at the 1 st cycle was higher than the theoretical capacity of SnO(2) (783 mAh g(-1)). Thus it has been clarified that the binder-free co-deposited film could operate as a negative electrode for lithium secondary batteries.