Novel fast Li-ion conductors for solid-state electrolytes from first-principles
PSI Center for Scientific Computing, Theory and Data, Paul Scherrer Institute（保罗谢勒研究所科学计算、理论与数据中心）；Theory of Condensed Matter, Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室凝聚态理论组）
We present a high-throughput computational screening for fast lithium-ion conductors to identify promising materials for application in all solid-state electrolytes. Starting from more than 30,000 Li-containing experimental structures sourced from Crystallography Open Database, Inorganic Crystal Structure Database and Materials Platform for Data Science, we perform highly automated calculations to identify electronic insulators. On these ~1000 structures, we use molecular dynamics simulations to estimate Li-ion diffusivities using the pinball model, which describes the potential energy landscape of diffusing lithium with accuracy similar to density functional theory while being 200-500 times faster. Then we study the ~60 most promising and previously unknown fast conductors with full first-principles molecular dynamics simulations at several temperatures to estimate their activation barriers. The results are discussed in detail for the 9 fastest conductors, including $Li_7NbO_6$ which shows a remarkable ionic conductivity of ~5 mS/cm at room temperature. We further present the entire screening protocol, including the workflows where the accuracy of the pinball model is improved self-consistently, necessary to automatically running the required calculations and analysing their results.
A Perspective on Training Machine Learning Force Fields for Solid-State Electrolyte Materials
School of Materials Science and Engineering, Zhejiang University（浙江大学材料科学与工程学院）；Department of Materials Science and Engineering, Westlake University（西湖大学材料科学与工程系）
Potential jumps at transport bottlenecks cause instability of nominally ionic solid electrolytes in electrochemical cells
电化学装置如固体氧化物燃料电池（SOFC）、固体氧化物电解槽电池（SOEC）和锂离子电池（LIB）的正常操作有时会由于意外形成内相而失败。这些相包括SOEC的氧化锆电解质内的晶界处的氧气泡、全固态LIB的（石榴石型）Li 7 La 3 Zr 2 O 12电解质内的孤立的Li金属岛以及Na-S电池的Na-β-氧化铝和NASICON电解质内的类似Na金属岛。值得注意的是，虽然这些设备可以在两种极性下工作，但故障的倾向取决于极性。在这里，我们解释这些和其他现象在名义上的离子固体电解质和混合导电电极在简单的热力学和动力学方面：意想不到的内部相是由一个大的潜在的跳跃，需要推动一个恒定的离子或电子流通过其内部传输瓶颈。内相形成的明确规则，包括其极性依赖性制定，以帮助预测和减轻它，这将导致微观结构不稳定，效率恶化和击穿。
A Fibrous Solid Electrolyte for Lithium-ion Batteries
在这项工作中提出的新方法使用氧化物细丝/纤维代替致密的薄膜电解质，从而允许：（i）直接制造而不使用昂贵的薄膜生产技术，（ii）现有锂离子电池生产线的微小变化，以及（iii）更好的机械稳定性和电化学性能。采用静电纺丝技术制备了Li 7 La 3 Zr 2 O 12（LLZO）纤维作为电解质。利用X射线衍射（XRD）和扫描电镜（SEM）对产物的物相和形貌进行了表征。结果表明，所制备的电解液在电池安全性和性能方面是电动汽车用全固态电池的良好替代品。
Effect of lithium bis(oxalato)borate on the Structural, microstructural and electrochemical properties of blend solid polymer electrolyte
采用溶液浇铸法制备了以PEO、PVP为主体的锂离子复合聚合物电解质LiBOB，考察了LiBOB对聚合物电解质的形貌、结构和电化学性能的影响。XRD和FESEM分析表明，盐的加入提高了非晶含量。FTIR光谱证明了络合物的形成。优化体系的离子电导率比无盐体系高两个数量级，即~0.5x10-5 S cm-1（@RT），当O/Li=16时，提高到~0.65 mS cm-1（@100 oC），电导率随温度的变化符合Arrhenius性质。高的离子（~0.99）证明了络合电解质的离子性质。DSC分析表明，结晶度的抑制和玻璃熔融温度向低温移动意味着非晶含量的增加。最后，提出了一个相互作用机制，探索离子传输机制。本电解质体系可作为固态电池的潜在候选者
A Comparative Study of Molecular Dynamics Approaches for Simulating Ionic Conductivity in Solid Lithium Electrolytes
Université de Montréal（蒙特利尔大学）；Mila – Quebec AI Institute（米拉-魁北克人工智能研究所）；National Research Council Canada（加拿大国家研究委员会）；Institut Courtois, Université de Montréal（蒙特利尔大学库尔图瓦研究所）
Synergetic Enhancement on Bulk and Grain Boundary Ionic Conduction of Mg Doped High-Entropy NASICON-Type Solid Electrolyte for Solid-State Na+ Batteries by Spray Flame Synthesis
Particle Morphology and Lithium Segregation to Surfaces of the Li$_7$La$_3$Zr$_2$O$_{12}$ Solid Electrolyte
用于固态锂离子电池的固体电解质激发了对下一代能量存储应用的极大兴趣。Li $_7$ La $_3$ Zr $_2$ O $_{12}$石榴石型固体电解质由于其高离子电导率而受到相当大的关注。然而，基于Li $_7$ La $_3$ Zr $_2$ O $_{12}$的固态器件的成功应用仍然存在若干挑战，例如枝晶形成和在许多Li嵌入/提取循环中保持界面处的物理接触。在这里，我们应用第一性原理密度泛函理论提供的见解，在各种物理和化学条件下的Li $_7$ La $_3$ Zr $_2$ O $_{12}$粒子形态。我们的研究结果表明，锂偏析的表面，建议富锂晶界在典型的合成和烧结条件。我们的研究结果的基础上，我们提出了切实可行的策略，以遏制Li $_7$ La $_3$ Zr $_2$ O $_{12}$接口的Li偏析。这种方法可以扩展到其他锂离子导体的实际储能装置的设计。
Machine Learning Prediction Models for Solid Electrolytes based on Lattice Dynamics Properties
Kyungpook National University（庆北国立大学）；Sungkyunkwan University（成均馆大学）；Harvard University（哈佛大学）；Korea Research Institute of Chemical Technology（韩国化学技术研究院）
Strain-Dependent Ionic Transport in Li3YCl6 Solid Electrolytes
William A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston（休斯顿大学威廉·A·布鲁克夏尔化学与生物分子工程系）；Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China（电子科技大学前沿科学与工程学院）
Li$_{14}$Mn$_{2}$S$_{9}$ and Li$_{10}$Si$_{2}$S$_{9}$ as a pair of all-electrochem-active electrode and solid-state electrolyte with chemical compatibility and low interface resistance
Synergistic Interface Stability and High Room-Temperature Ionic Conductivity for Wide-Temperature All-Solid-State Batteries Based on Li6+xSixSb1-xS5I Electrolytes
Raman Spectroscopy Insights into the Reorientational Dynamics of Polyanions in Solid Electrolytes
Key Laboratory of Organic Compound Pollution Control Engineering (MOE), School of Environmental and Chemical Engineering, Shanghai University（上海大学环境化学工程学院有机化合物污染控制工程重点实验室（教育部））；University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University（密歇根-上海交通大学联合学院，上海交通大学）；Department of Chemistry, School of Science, Shanghai University（上海大学理学院化学系）
$Ab$ $initio$ Study of Substitutional Defects in Li$_{3}$OCl Solid Electrolyte for Li-ion Batteries
University of Missouri Research Reactor, University of Missouri（密苏里大学研究反应堆，密苏里大学）；Department of Physics and Astronomy, University of Missouri（密苏里大学物理与天文学系）；Materials Science and Engineering Institute, University of Missouri（密苏里大学材料科学与工程研究所）；Department of Chemical and Biomedical Engineering, University of Missouri（密苏里大学化学与生物医学工程系）
