Improvement of high-rate discharging performance of LiFePO4 cathodes by forming micrometer-sized through-holed electrode structures with a pico-second pulsed laser

Tsuda, Takashi; Ando, Nobuo; Nakamura, Susumu; Ishihara, Yuuta; Hayashi, Narumi; Soma, Naohiko; Gunji, Takao; Tanabe, T.; Ohsaka, Takeo; Matsumoto, Futoshi

doi:10.1016/j.electacta.2018.11.014

Cited by 35 publications

(26 citation statements)

References 28 publications

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“…17) is much smaller (20). This larger discharging capacity retention of the holed cathodes can be considered to reflect the fact that a facilitated transfer of Li + ions in the discharging process can occur through both the surface and the sidewalls (produced by forming the holes) of the LFP layer (or LFP/current collector layers), as found recently for the LFP/LFP cathode with the same LFP thickness on both side of a current collector [25][26][27] and the LFP/activated carbon (AC) cathode (in which the thicknesses of LFP and AC layers are different). 28 Table 1.…”

Section: Cathodementioning

confidence: 58%

“…1) in which LFP layers were coated on both sides of an Al current collector foil were prepared using the same electrode materials and conditions as those reported in our previous papers. [25][26][27] The preparation is described in detail in the electric supporting information (SI). In order to prepare the LFP/LFP cathodes with different LFP loading amounts on both sides of the Al foil, the gap of a doctor-blade coater was suitably adjusted to prepare the LFP layers with different loading amounts, typically ca.…”

Section: Methodsmentioning

confidence: 99%

“…0.7-1.0, 1.9-2.1, 3.6-4 and 5.6-6 mg cm ¹2 (Table 1). Holing and characterization of these LFP/LFP cathodes was conducted using a picosecond pulsed laser as described previously [25][26][27][28] (see 1.2 and 1.3 in the SI). Table 1 lists 23 LFP/LFP cathodes examined in this study and hereafter the individual cathodes will be denoted as No.…”

Section: Methodsmentioning

confidence: 99%

“…[14][15][16][17][18][19][20][21][22][23][24] Recently, we have found that the formation of micrometer-sized holes on the cathodes, i.e., through-holed and non-through-holed cathodes provides a remarkable improvement in the high-rate charging/discharging performance due to the increased paths available in Li + ion transfer from/to the active materials (LFP and graphite layers). [25][26][27] In this study, we aim at clarifying the effect of a grid-patterned micrometer-sized cathode holing on the high-rate discharging performance of the LFP/LFP cathodes which are composed of LFP layer/Al current collector/LFP layer and have different LFP loading amounts (i.e., different capacities) on both sides of an Al current collector and thus will be called "unbalanced" LFP/LFP cathodes. The discharging rate-performance of three kinds of the unbalanced LFP/LFP cathodes, i.e., through-holed, nonthrough-holed and non-holed unbalanced cathodes ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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An Improved High-rate Discharging Performance of “Unbalanced” LiFePO4 Cathodes with Different LiFePO4 Loadings by a Grid-patterned Micrometer Size-holed Electrode Structuring

et al. 2019

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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 Crates (e.g., 0.1 C). However, the rate-performance data obtained at high Crates (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 Crates 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 Crates which are, for example, larger than 5 C, while the holed ones showed no degradation in capacity even at high Crates (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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Section: Cathodementioning

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Improved High-rate Discharging Performance of “Unbalanced” LiFePO4 Cathodes with Different LiFePO4 Loadings by a Grid-patterned Micrometer Size-holed Electrode Structuring

et al. 2019

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“…Lasers can be applied for sintering various materials including metals, ceramics, and polymers [94][95][96]. In recent years, laser processing has been employed in the fabrication of electrodes [97], supercapacitors [98,99], even full batteries [100]. Successful micromanufacturing includes laser-drilling of microholes in LiFePO 4 cathode for Li-ion batteries [101] and laser carbonization anode (graphene) for an interdigital film battery [102].…”

Section: Laser Processingmentioning

confidence: 99%

Recent Progress of Metal–Air Batteries—A Mini Review

et al. 2019

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With the ever-increasing demand for power sources of high energy density and stability for emergent electrical vehicles and portable electronic devices, rechargeable batteries (such as lithium-ion batteries, fuel batteries, and metal–air batteries) have attracted extensive interests. Among the emerging battery technologies, metal–air batteries (MABs) are under intense research and development focus due to their high theoretical energy density and high level of safety. Although significant progress has been achieved in improving battery performance in the past decade, there are still numerous technical challenges to overcome for commercialization. Herein, this mini-review summarizes major issues vital to MABs, including progress on packaging and crucial manufacturing technologies for cathode, anode, and electrolyte. Future trends and prospects of advanced MABs by additive manufacturing and nanoengineering are also discussed.

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Oriented Structures for High Safety, Rate Capability, and Energy Density Lithium Metal Batteries

Wang,

Tieu,

et al. 2024

Advanced Science

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Lithium metal batteries (LMBs) have emerged in recent years as highly promising candidates for high‐density energy storage systems. Despite their immense potential, mutual constraints arise when optimizing energy density, rate capability, and operational safety, which greatly hinder the commercialization of LMBs. The utilization of oriented structures in LMBs appears as a promising strategy to address three key performance barriers: 1) low efficiency of active material utilization at high surface loading, 2) easy formation of Li dendrites and damage to interfaces under high‐rate cycling, and 3) low ionic conductivity of solid‐state electrolytes in high safety LMBs. This review aims to holistically introduce the concept of oriented structures, provide criteria for quantifying the degree of orientation, and elucidate their systematic effects on the properties of materials and devices. Furthermore, a detailed categorization of oriented structures is proposed to offer more precise guidance for the design of LMBs. This review also provides a comprehensive summary of preparation techniques for oriented structures and delves into the mechanisms by which these can enhance the energy density, rate capability, and safety of LMBs. Finally, potential applications of oriented structures in LMBs and the crucial challenges that need to be addressed in this field are explored.

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Improvement of high-rate discharging performance of LiFePO4 cathodes by forming micrometer-sized through-holed electrode structures with a pico-second pulsed laser

Cited by 35 publications

References 28 publications

An Improved High-rate Discharging Performance of “Unbalanced” LiFePO<sub>4</sub> Cathodes with Different LiFePO<sub>4</sub> Loadings by a Grid-patterned Micrometer Size-holed Electrode Structuring

An Improved High-rate Discharging Performance of “Unbalanced” LiFePO<sub>4</sub> Cathodes with Different LiFePO<sub>4</sub> Loadings by a Grid-patterned Micrometer Size-holed Electrode Structuring

Recent Progress of Metal–Air Batteries—A Mini Review

Oriented Structures for High Safety, Rate Capability, and Energy Density Lithium Metal Batteries

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