Processing of a Large-Scale Microporous Group on Copper Foil Current Collectors for Lithium Batteries Using Femtosecond Laser
Processing of a Large-Scale Microporous Group on Copper Foil Current Collectors for Lithium Batteries Using Femtosecond Laser
复制标题
使用飞秒激光在锂电池铜箔集流体上加工大型微孔团
DOI：
10.1002/adem.202000710
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发表时间：
2020-09-03
影响因子：
3.6
通讯作者：
Mei, Xuesong
中科院分区：
文献类型：
--
作者：
Li, Quansheng;Sun, Xiaofei;Mei, Xuesong
由于铜箔集流体的厚度薄（约8 μ m）和柔软性，在其表面加工大规模的微纳米孔是极其困难的。在这项研究中，铜箔集流体与1030 nm的飞秒激光系统的套料钻孔的研究重点是开发具有不同的入口和出口尺寸的铜箔集流体的加工技术，同时保持良好的孔质量。综合研究了激光参数对铜箔集流体加工质量的影响。讨论了几何形貌与工艺参数的关系及形成机理。在离焦量为-1.8 mm时发现最小的孔锥度。因此，在（2 cm x 2 cm）集流体上获得了具有250 000个微孔的孔组，证明了基于飞秒激光的加工的高效率和高质量。在循环性能和倍率性能方面，具有改性集流体的半电池比具有未改性铜箔的半电池以更稳定的响应运行。
Due to the thin thickness (approximate to 8 mu m) 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 x 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.