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引用次数: 0
摘要
钠(Na)树枝状突起的生长带来了短路和容量损失等挑战,其潜在机制尚不清楚。虽然 Na 树突生长的实验已有报道,但能帮助分析其形态演变机制的模拟却很少。针对这一难题,我们建立了一个相场模型,以探索电流密度、各向异性强度和 Na 离子消耗对 Na 树枝状晶形态演变的影响。研究发现,较高的电流密度会促进更多树枝状突起和侧枝的生长。各向异性强度影响树突的水平和垂直生长速度,水平生长超过或等于垂直生长,从而降低短路风险。Na-离子消耗量的增加会导致树突结构出现明显的横向分支、扭结和孔隙。这些结果为缓解不稳定枝晶的形成提供了有价值的见解,对开发具有高稳定性和安全性的钠基电池具有重要意义。
Phase field simulation of dendrites morphology evolution in sodium metal batteries
Sodium (Na) dendrite growth poses challenges such as short circuits and capacity loss, and the underlying mechanisms are unclear. Although the experiments of Na dendrite growth were reported, there are very few simulations that can assist in analyzing its morphology evolution mechanism. In addressing this challenge, we develop a phase-field model to explore the influence of current density, anisotropic strength, and Na-ion consumption on the evolution of Na dendrite morphology. It is found that higher current density promotes more dendrite growth and lateral branches. Anisotropy strength influences dendrite growth rates horizontally and vertically, with horizontal growth exceeding or equaling vertical growth, reducing short-circuit risks. Increased Na-ion consumption results in significant lateral branches, kinks, and pores in dendrite structures. These results offer valuable insights into mitigating the formation of erratic dendrites, holding significant implications for the advancement of Na-based batteries with high stability and safety.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems