An improved pre-lithiation of graphite anodes using through-holed cathode and anode electrodes in a laminated lithium ion battery. (20th November 2019)

• Record Type: Journal Article
• Authors: Watanabe, Tatsuya; Tsuda, Takashi; Ando, Nobuo; Nakamura, Susumu; Hayashi, Narumi; Soma, Naohiko; Gunji, Takao; Ohsaka, Takeo; Matsumoto, Futoshi
• Is Part Of: Electrochimica acta. Volume 324(2019)
• Publication Date: 2019-11-20
• Subjects: Li ion battery -- Through-holed structured electrodes -- Pre-lithiation -- Pico-second pulsed laser; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.134848
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In order to actually compensate "an irreversible capacity ( i.e., an active lithium loss) ˮ usually observed at the 1st charging/discharging cycle of lithium ion batteries (LIBs), e.g., caused by a solid-electrolyte interphase (SEI) formation, a so-called pre-lithiation was applied to the graphite anodes of the laminated cell composed of three graphite anodes and three LFP (lithium iron phosphate) cathodes which were through-holed with the hole diameter of 20, 100 or 200 μm like the squares of a "Go-board". The pre-lithiation was carried out (keeping an appropriate pre-lithiation charge amount) firstly by directly contacting the anodes with Li metal, which was previously introduced in the cell, to intercalate Li + ions to them and then conducting the capacity balancing among the Li + -intercalated anodes by contacting them for a various period of time. It was found that in the cell composed of the through-holed anodes and cathodes with a given hole diameter the irreversible capacity can be significantly reduced by appropriately choosing the pre-lithiation charge amount and the capacity balancing time. Typically, in the anodes (the hole diameter: 20 μm) with the total capacity of 35 mAh, when the pre-lithiation charge amount was 3 mAh and the capacity balancing time was 12 h, no irreversible capacity could be observed actually, i.e., the 1st charge capacity was close to 100% and the expected stable charge/discharge capacities were obtained with the capacity retention of almost 100% in the continuous charge/discharge cycle. The results obtained demonstrate that the pre-lithiation of LIBs can be significantly improved using through-holed anodes and cathodes. Graphical abstract: Image 1