Challenges, laser processing and electrochemical characteristics on application of ultra-thick electrode for high-energy lithium-ion battery

고에너지 리튬이온 전지용 초두께 전극 적용에 관한 과제, 레이저 가공 및 전기화학적 특성

Junsu Park , Chanyoung Jeon , Wonhee Kim , Sung-Jae Bong , Sungho Jeong , Hyeong-Jin Kim  

Lithium-ion batteries with ultra-thick electrodes are difficult to manufacture due to high internal resistance. This study reports on the effects of laser structuring of ultra-thick electrodes for high-energy batteries. Lithium cobalt oxide anodes (700 μm) and graphite cathodes (650 μm) are prepared with an areal discharge capacity of 25 mAh cm−2. After laser structuring, the surface morphology and chemical properties of the electrodes are investigated, and the internal resistance and diffusion characteristics are analyzed using electrochemical impedance spectroscopy. Laser structuring reduces twisting, decreases electron and ion resistance, and enhances diffusion characteristics. The rate capability and areal discharge capacity of the laser-structured cells increase fivefold compared to unstructured cells under 0.1 C conditions. Therefore, laser structuring presents a viable approach for high-energy batteries.