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

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Processing of a Large‐Scale Microporous Group on Copper Foil Current Collectors for Lithium Batteries Using Femtosecond Laser
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-08-14 , DOI: 10.1002/adem.202000710
Quansheng Li _{1,

2} , Xiaofei Sun _{1,

2} , Wanqin Zhao _{2,

3,

4} , Xiangguo Hou _{1,

2} , Yihua Zhang _{1,

2} , Fei Zhao _{1,

2} , Xindi Li ₂ , Xuesong Mei _{1,

2}

Affiliation

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.

中文翻译：

飞秒激光处理锂电池铜箔集电器上的大型微孔团

由于铜箔集电器的厚度薄（约8μm）和柔软的特性，因此很难在其表面上处理大型的微纳米孔。在这项研究中，研究了使用1030 nm飞秒激光系统对铜箔集电器进行的深孔钻削，重点在于开发具有不同出入口尺寸的铜箔集电器的加工技术，同时保持良好的孔质量。全面研究了激光参数对铜箔集电器加工质量的影响。充分讨论了几何形态与加工参数之间的关系以及形成机理。发现最小的孔锥度为-1.8毫米的散焦量。所以，在（2 cm×2 cm）集电器上获得了一组具有25万个微孔的孔，证明了飞秒激光加工的高效率和高质量。具有改进型集电器的半电池在循环性能和倍率性能方面的响应要比未改性铜箔的半电池更稳定。

更新日期：2020-08-14

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