Improvement of high-rate charging/discharging performance of a lithium ion battery composed of laminated LiFePO4 cathodes/ graphite anodes having porous electrode structures fabricated with a pico-second pulsed laser. (20th November 2018)

• Record Type: Journal Article
• Authors: Tsuda, Takashi; Ando, Nobuo; Matsubara, Kazuki; Tanabe, Toyokazu; Itagaki, Kaoru; Soma, Naohiko; Nakamura, Susumu; Hayashi, Narumi; Gunji, Takao; Ohsaka, Takeo; Matsumoto, Futoshi
• Is Part Of: Electrochimica acta. Volume 291(2018)
• Page Start: 267
• Page End: 277
• Publication Date: 2018-11-20
• Subjects: Porous electrode -- Li ion battery -- Pico-second pulsed laser -- High-rate charging/discharging performance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.08.149
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: To improve the high-rate charging/discharging performance of a cell of laminated lithium iron phosphate (LiFePO4 ) cathodes/graphite anodes, micrometer-sized through-holes were formed on the electrode surfaces with a pico-second pulsed laser. The through-holes having 20 μm diameter were uniformly arranged with a hole opening rate of 1% as the ratio of the holed and un-holed areas on the cathode and anode surface. Compared with the cells fabricated from non-porous electrodes and electrodes prepared with the conventional porous current collectors, the present cell composed of the porous anode and cathode electrodes showed a large discharge capacity retention even at a high current density. The formation of through-holes on the electrodes provides a remarkable improvement in the high-rate charging/discharging performance as a result of the increased paths available in Li + ion transfer from/to the active materials (LiFePO4 and graphite layers). Graphical abstract: