Making Li metal batteries (LMBs) with thinner Li is necessary to improve the cell energy density in practice. Li metal powders (LMPs) are beneficial for the facile manufacturing of thin Li, flexible cell design, and the 3D control of Li plating/stripping. However, the inhomogeneous surfaces of commercial LMPs limit their practical use in LMBs. Herein, a 20 µm‐thick, LiNO3 preplanted LMP (LN‐LMP) composite electrode, rationally designed for LMP surface stabilization, is presented. The addition of LiNO3 into the slurry uniformly modified the LMP surface by N‐rich solid‐electrolyte interphase (SEI). Preplanted LiNO3 further acts as a reservoir for the sustainable release into the electrolyte, thereby repairing the SEI upon cycling. The LMBs with LN‐LMP exhibited excellent cycling performances (450 cycles at 87.3% retention) compared to the control cells, and even outperformed the cells with LiNO3‐containing electrolytes. Further verification with high loading of a LiNixMnyCo1–x–yO2 (NMC) cathode demonstrated the feasibility of the practical cells and the versatility of the thin, LN‐LMP anode combined with advanced electrolytes.

The digital twin technique has been broadly utilized to efficiently and effectively predict the performance and problems associated with real objects via a virtual replica. However, the digitalization of twin electrochemical systems has not been achieved thus far, owing to the large amount of required calculations of numerous and complex differential equations in multiple dimensions. Nevertheless, with the help of continuous progress in hardware and software technologies, the fabrication of a digital twin‐driven electrochemical system and its effective utilization have become a possibility. Herein, a digital twin‐driven all‐solid‐state battery with a solid sulfide electrolyte is built based on a voxel‐based microstructure. Its validity is verified using experimental data, such as effective electronic/ionic conductivities and electrochemical performance, for LiNi0.70Co0.15Mn0.15O2 composite electrodes employing Li6PS5Cl. The fundamental performance of the all‐solid‐state battery is scrutinized by analyzing simulated physical and electrochemical behaviors in terms of mass transport and interfacial electrochemical reaction kinetics. The digital twin model herein reveals valuable but experimentally inaccessible time‐ and space‐resolved information including dead particles, specific contact area, and charge distribution in the 3D domain. Thus, this new computational model is bound to rapidly improve the all‐solid‐state battery technology by saving the research resources and providing valuable insights.

The commercialization of Li metal electrodes is a long-standing objective in the battery community. To accomplish this goal, the formation of Li dendrites and mossy Li deposition, which cause poor cycle performance and safety issues, must be resolved. In addition, it is necessary to develop wide and thin Li metal anodes to increase not only the energy density, but also the design freedom of large-scale Li-metal-based batteries. We solved both issues by developing a novel approach involving the application of calendared stabilized Li metal powder (LiMP) electrodes as anodes. In this study, we fabricated a 21.5 cm wide and 40 μm thick compressed LiMP electrode and investigated the correlation between the compression level and electrochemical performance. A high level of compression (40% compression) physically activated the LiMP surface to suppress the dendritic and mossy Li metal formation at high current densities. Furthermore, as a result of the LiMP self-healing because of electrochemical activation, the 40% compressed LiMP electrode exhibited an excellent cycle performance (reaching 90% of the initial discharge capacity after the 360th cycle), which was improved by more than a factor of 2 compared to that of a flat Li metal foil with the same thickness (90% of the initial discharge capacity after the 150th cycle).

PurposeGonadotropin-releasing hormone agonist (GnRHa) is known for improving final adult height in patients with central precocious puberty (CPP). This study aimed to investigate the age of menarche and near adult height in girls with CPP who had been treated with GnRHa.MethodsIn this retrospective study, we reviewed the medical records of 71 Korean girls with CPP who had started menarche or reached over 13 years of bone age after long-term GnRHa treatment. We estimated near adult height using the Bayley-Pinneau method and identified the age of menarche in girls with CPP.ResultsMean chronological and bone age at menarche were 11.9±0.7 and 12.8±0.4 years, respectively. The period between menarche and the end of treatment was 14.0±5.6 months. Posttreatment near adult height was 163.8±4.7 cm, which was significantly greater than pretreatment predicted adult height (158.7±4.1 cm).ConclusionGnRHa treatment in girls with CPP could improve final adult height and made the age of menarche close to that of the general population.

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