Fractal titanium oxide under inverse 10-ns laser deposition in air and water

Pan, An; Wang, Wenjun; Mei, Xuesong; Lin, Qijing; Cui, Jianlei; Wang, Kedian; Zhai, Zhen

doi:10.1007/s00339-017-0892-7

Cited by 27 publications

(4 citation statements)

References 33 publications

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“…Meanwhile, the porous structure is beneficial to reduce the mass of the unit volume. It can improve the capacity of the unit area when coated with the active material of high specific capacity and enable the battery to serve at a high rate for a long cycle. − However, the complexity of the synthesis process and the high cost of raw material/equipment limits the preparation and industrial application of the 3D structural current collector. Moreover, investigations on the synergistic effect of the columnar crystal and through-hole structure for the electrochemical performance of LIBs assembled by the Cu foil with a through-hole array and columnar crystal on the surface (CC/THCu) current collector have rarely been conducted.…”

Section: Introductionmentioning

confidence: 99%

Lightweight Through-Hole Copper Foil as a Current Collector for Lithium-Ion Batteries

Fei

Dong

Gong

et al. 2021

ACS Appl. Mater. Interfaces

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In the past few decades, much effort has been dedicated to improve electrochemical performance of lithium-ion batteries (LIBs) through material design. Less attention, however, has been paid to structure engineering of battery components, which is an effective way for improving the electrochemical performance of LIBs. In this work, a lightweight Cu current collector with a through-hole array and columnar crystal on the surface (CC/THCu) was designed and fabricated using a nanosecond ultraviolet laser and electrodeposition processing to enhance specific capacity and cycle stability of LIBs. The synergistic effect of the columnar crystal and through-hole structure for improving electrochemical performances of LIBs assembled with the CC/THCu current collector was investigated. The results show that the complex structure provides spaces for volume expansion and reduces volume variation. When the hole fraction reaches 20%, the weight loss of CC/THCu is 28.41%. The corresponding LIB with the 20% hole fraction CC/THCu shows a high residual capacity rate of 81.2% and enhanced specific capacity (55.9% compared to the LIB with a bare Cu current collector). At a high rate of 1 C, the remaining specific capacity of the LIB with the CC/THCu current collector is better than that with the bare Cu current collector after 200 cycles. The CC/THCu current collector effectively improves the specific capacity and cycle stability of LIBs in contrast to the bare Cu current collector.

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Section: Introductionmentioning

confidence: 99%

Lightweight Through-Hole Copper Foil as a Current Collector for Lithium-Ion Batteries

Fei

Dong

Gong

et al. 2021

ACS Appl. Mater. Interfaces

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“…In comparison, laser processing technology is a flexible, controllable, nonpolluting, and noncontact precision processing method under atmospheric conditions. [13][14][15][16][17][18] Lasers can be used to process complex 3D structures [19][20][21] with high quality and high precision. This has emerged as a new frontier in the development of laser manufacturing technology.…”

Section: Introductionmentioning

confidence: 99%

Processing of a Large‐Scale Microporous Group on Copper Foil Current Collectors for Lithium Batteries Using Femtosecond Laser

Sun

Zhao

et al. 2020

Adv Eng Mater

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Due to the thin thickness (≈8 μm) and soft nature of copper foil current collectors, it is extremely difficult to process large‐scale micro–nano holes on their surface. In this study, trepanning drilling of a copper foil current collector with a 1030 nm femtosecond laser system is investigated with emphasis on developing the processing technology of copper foil current collectors with different entry and exit sizes while maintaining good hole quality. The effects of laser parameters on the processing quality of copper foil current collectors are comprehensively studied. The relationship between geometric morphology and processing parameters as well as the formation mechanism is fully discussed. The smallest hole taper is found at a defocusing amount of −1.8 mm. Consequently, a group of holes with 250 000 micropores is obtained on a (2 cm × 2 cm) current collector, demonstrating the high efficiency and high quality of femtosecond laser‐based processing. Half‐cells with a modified current collector operate with a more stable response than half‐cells with unmodified copper foil at cycle performance and rate performance.

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“…Some nanoparticles deposit back onto the material’s surface to form microscale aggregates. The laser processing parameters affect both the size and morphology of microscale aggregates. , Hence, micro–nano structures can be prepared by precisely controlling the in situ deposition during laser ablation, which can simplify the fabrication process of micro–nano composite structures.…”

Section: Introductionmentioning

confidence: 99%

Broad-Band Ultra-Low-Reflectivity Multiscale Micro–Nano Structures by the Combination of Femtosecond Laser Ablation and In Situ Deposition

Chen

Wang

Tao

et al. 2020

ACS Appl. Mater. Interfaces

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Functional surfaces with broad-band ultralow optical reflection have many potential applications in areas like national defense and energy conversion. For efficient, high-quality manufacturing of material surfaces with antireflection features, a novel machining method for multiscale micro–nano structures is proposed. This method can enable the collaborative manufacturing of both microstructures via laser ablation and micro–nano structures with high porosity via in situ deposition, and it can simplify the fabrication process of multiscale micro–nano structures. As a result, substantially improved antireflection properties of the treated material surface can be realized by optimizing light trapping of the microstructures and enhancing the effective medium effect for the micro–nano structures with high porosity. In ultraviolet–visible–near-infrared regions, average reflectances, as low as 2.21 and 3.33%, are achieved for Si and Cu surfaces, respectively. Furthermore, the antireflection effect of the treated surface can also be extended to the mid-infrared wavelength range, where the average reflectances for the Si and Cu surfaces decrease to 5.28 and 5.18%, respectively. This novel collaborative manufacturing method is both simple and adaptable for different materials, which opens new doors for the preparation of broad-band ultra-low-reflectivity materials.

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Fractal titanium oxide under inverse 10-ns laser deposition in air and water

Cited by 27 publications

References 33 publications

Lightweight Through-Hole Copper Foil as a Current Collector for Lithium-Ion Batteries

Lightweight Through-Hole Copper Foil as a Current Collector for Lithium-Ion Batteries

Processing of a Large‐Scale Microporous Group on Copper Foil Current Collectors for Lithium Batteries Using Femtosecond Laser

Broad-Band Ultra-Low-Reflectivity Multiscale Micro–Nano Structures by the Combination of Femtosecond Laser Ablation and In Situ Deposition

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