Seok Jae Young, Kim Sanha, Yang Inyeong, Park Jung Hwan, Lee Jaehak, Kwon Sin, Woo Kyoohee
Department of Printed Electronics, Nano-Convergence Manufacturing Systems Research Division, Korea Institute of Machinery and Materials(KIMM), 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Republic of Korea.
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology(KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Apr 7;13(13):15205-15215. doi: 10.1021/acsami.0c22983. Epub 2021 Mar 26.
Si has attracted considerable interest as a promising anode material for next-generation Li-ion batteries owing to its outstanding specific capacity. However, the commercialization of Si anodes has been consistently limited by severe instabilities originating from their significant volume change (approximately 300%) during the charge-discharge process. Herein, we introduce an ultrafast processing strategy of controlled multi-pulse flash irradiation for stabilizing the Si anode by modifying its physical properties in a spatially stratified manner. We first provide a comprehensive characterization of the interactions between the anode materials and the flash irradiation, such as the condensation and carbonization of binders, sintering, and surface oxidation of the Si particles under various irradiation conditions (e.g., flash intensity and irradiation period). Then, we suggest an effective route for achieving superior physical properties for Si anodes, such as robust mechanical stability, high electrical conductivity, and fast electrolyte absorption, via precise adjustment of the flash irradiation. Finally, we demonstrate flash-irradiated Si anodes that exhibit improved cycling stability and rate capability without requiring costly synthetic functional binders or delicately designed nanomaterials. This work proposes a cost-effective technique for enhancing the performance of battery electrodes by substituting conventional long-term thermal treatment with ultrafast flash irradiation.
由于其出色的比容量，硅作为下一代锂离子电池有前景的负极材料引起了广泛关注。然而，硅负极的商业化一直受到严重不稳定性的限制，这种不稳定性源于其在充放电过程中显著的体积变化（约300%）。在此，我们介绍一种超快处理策略，即通过空间分层方式改变其物理性质来稳定硅负极的受控多脉冲闪光辐照。我们首先全面表征了负极材料与闪光辐照之间的相互作用，例如在各种辐照条件（如闪光强度和辐照时间）下粘结剂的凝聚和碳化、烧结以及硅颗粒的表面氧化。然后，我们通过精确调整闪光辐照，提出了一条实现硅负极优异物理性质的有效途径，如稳健的机械稳定性、高电导率和快速电解质吸收。最后，我们展示了闪光辐照的硅负极，其在不使用昂贵的合成功能粘结剂或精心设计的纳米材料的情况下，表现出改善的循环稳定性和倍率性能。这项工作提出了一种经济有效的技术，通过用超快闪光辐照替代传统的长期热处理来提高电池电极的性能。
