Anode materials are an essential part of lithium-ion batteries (LIBs), which determine the performance and safety of LIBs. Currently, graphite, as the anode material of commercial LIBs, is limited by its low theoretical capacity of 372 mA·h·g^?1, thus hindering further development toward high-capacity and large-scale applications. Alkaline earth metal iron-based oxides are considered a promising candidate to replace graphite because of their low preparation cost, good thermal stability, superior stability, and high electrochemical performance. Nonetheless, many issues and challenges remain to be addressed. Herein, we systematically summarize the research progress of alkaline earth metal iron-based oxides as LIB anodes. Meanwhile, the material and structural properties, synthesis methods, electrochemical reaction mechanisms, and improvement strategies are introduced. Finally, existing challenges and future research directions are discussed to accelerate their practical application in commercial LIBs.

Finally, the limitations of laser processing at present are summarized, and the application and development of laser micromachining technology in the field of medical equipment in the future are prospected. Although laser microprocessing technology can micro-process a new generation of implantable medical devices with extremely fine structure, making the commercial use of the next generation of implantable medical devices feasible, the development of laser micro-processing technology in the biomedical field is not mature enough, the production efficiency is low, and the work stability needs to be improved. For the laser micromachining process, a complete set of theories has not yet been formed to explain the physical nature of the interaction between the laser and material under the extreme conditions of ultra-fast, ultra-short, and ultra-strong, nor can the impact of laser micromachining on the material structure and physical and chemical properties be well evaluated. The next work still needs a lot of basic and regular research. At the same time, according to the characteristics of laser micromachining and the properties of the processed materials, it is also necessary to develop simulation analysis software to simulate the micromachining process and optimize the parameters of the laser micromachining process.

This erratum corrects typos that appeared in Photon. Res.8, 127 (2020)PRHEIZ2327-912510.1364/PRJ.8.000127 in the text, a figure showing the experimental setup, and a table listing the absorption and emission cross section values used in simulations.