2. Ultra-High Proportion of Grain Boundaries in Zinc Metal Anode Spontaneously Inhibiting Dendrites Growth 

아연 금속 음극에서 초고 비율의 결정립계가 덴드라이트 성장을 자발적으로 억제

https://onlinelibrary.wiley.com/doi/full/10.1002/ange.202406292

Sitian Lian, Zhijun Cai, Prof. Mengyu Yan, Prof. Congli Sun, Nianyao Chai, Bomian Zhang, Kesong Yu, Ming Xu, Dr. Jiexin Zhu, Dr. Xuelei Pan, Dr. Yuhang Dai, Jiazhao Huang, Bo Mai, Ling Qin, Wenchao Shi, Qiqi Xin, Xiangyu Chen, Dr. Kai Fu, Prof. Qinyou An, Dr. Qiang Yu, Prof. Liang Zhou, Dr. Wen Luo, Dr. Kangning Zhao, Prof. Xuewen Wang, Prof. Liqiang Mai 

Aqueous Zn-ion batteries are an attractive electrochemical energy storage solution for their budget and safe properties. However, dendrites and uncontrolled side reactions in anodes detract the cycle life and energy density of the batteries. Grain boundaries in metals are generally considered as the source of the above problems but we present a diverse result. This study introduces an ultra-high proportion of grain boundaries on zinc electrodes through femtosecond laser bombardment to enhance stability of zinc metal/electrolyte interface. The ultra-high proportion of grain boundaries promotes the homogenization of zinc growth potential, to achieve uniform nucleation and growth, thereby suppressing dendrite formation. Additionally, the abundant active sites mitigate the side reactions during the electrochemical process. Consequently, the 15 μm Fs−Zn||MnO2 pouch cell achieves an energy density of 249.4 Wh kg−1 and operates for over 60 cycles at a depth-of-discharge of 23 %. The recognition of the favorable influence exerted by UP-GBs paves a new way for other metal batteries. 

1. Review of the structure and performance of through-holed anodes and cathodes prepared with a picosecond pulsed laser for lithium-ion batteries

피코초 펄스 레이저로 제조된 리튬 이온 전지용 관통형 양극 및 음극의 구조 및 성능 검토

                                                                                                                    https://iopscience.iop.org/article/10.1088/2631-7990/aca1f0/meta                   

Futoshi Matsumoto5,1, Mitsuru Yamada1, Masaya Tsuta2, Susumu Nakamura2, Nobuo Ando3 and Naohiko Soma4 

1 Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, kanagawa-ku, Yokohama 221-8686, Japan 

2 Department of Electrical and Electronic Systems Engineering, National Institute of Technology, Nagaoka College, 888 Nishikatakai, Nagaoka, Niigata 940-8532, Japan 

3 Research Institute for Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan 

4 Wired Co., Ltd, 1628 Hitotsuyashiki Shinden, Sanjo, Niigata 959-1152, Japa 

To move the performance of lithium-ion batteries into the next stage, the modification of the structure of cells is the only choice except for the development of materials exhibiting higher performance. In this review paper, the employment of through-holing structures of anodes and cathodes prepared with a picosecond pulsed laser has been proposed. The laser system and the structure for improving the battery performance were introduced. The performance of laminated cells constructed with through-holed anodes and cathodes was reviewed from the viewpoints of the improvement of high-rate performance and energy density, removal of unbalanced capacities on both sides of the current collector, even greater high-rate performance by hybridizing cathode materials and removal of irreversible capacity. In conclusion, the points that should be examined and the problem for the through-holed structure to be in practical use are summarized.