Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Technological Report
An Improved High-rate Discharging Performance of “Unbalanced” LiFePO4 Cathodes with Different LiFePO4 Loadings by a Grid-patterned Micrometer Size-holed Electrode Structuring
Takashi TSUDAYuta ISHIHARATatsuya WATANABENobuo ANDOTakao GUNJINaohiko SOMASusumu NAKAMURANarumi HAYASHITakeo OHSAKAFutoshi MATSUMOTO
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ジャーナル オープンアクセス

2019 年 87 巻 6 号 p. 370-378

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The degradation of charging/discharging capacities in the rate-performance test of lithium iron phosphate (LFP) cathodes with different loading amounts of an active material on both sides of a current collector (i.e., “unbalanced” LFP/LFP cathodes) in a laminated cell (typically composed of anode/separator/unbalanced cathodes/separator/anode) was not observed actually at low C-rates (e.g., 0.1 C). However, the rate-performance data obtained at high C-rates (e.g., >5 C) indicated that the imbalance of the loading amounts of an active cathode material on both sides of an Al current collector causes a significant capacity degradation. We have found that it is possible to prevent the capacity degradation observed at high C-rates by holing the unbalanced LFP/LFP cathodes in a micrometer-sized grid-patterned way (the percentages of the holed area are typically several %) using a pico-second pulsed laser: The non-holed unbalanced LFP/LFP cathodes exhibited a considerable capacity degradation at C-rates which are, for example, larger than 5 C, while the holed ones showed no degradation in capacity even at high C-rates (e.g., 5–20 C). Forming micrometer-sized grid-patterned holes in the LFP/LFP cathodes leads to an improved capacity and high-rate performance of their charging/discharging processes.

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© 2019 The Electrochemical Society of Japan
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