Towards high-performance Li-ion batteries via optimized three-dimensional micro-lattice electrode architectures
Towards high-performance Li-ion batteries via optimized three-dimensional micro-lattice electrode architectures
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DOI：
10.1016/j.jpowsour.2020.228593
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发表时间：
2020-11
影响因子：
9.2
通讯作者：
Yaqi Zhu;Jie Li;M. S. Saleh;Hiep Pham;T. Plateau;R. Panat;Jonghyun Park
中科院分区：
文献类型：
--
作者：
Yaqi Zhu;Jie Li;M. S. Saleh;Hiep Pham;T. Plateau;R. Panat;Jonghyun Park
优化的三维（3D）电极架构有望提高电池性能，这是通过传统的层压结构无法实现的目标。本文报道了3D电极增强电池性能的机制。电池内部的电子/离子的扩散/迁移通过3D电化学模型进行了全面分析，随后通过气溶胶喷射打印制成的3D微晶格电极的实验进行了验证。绘制了锂浓度和电位分布图，以将电池性能与不同形状、厚度、堆积密度和孔隙率相关联。研究表明，决定电池性能的主要因素是电解质中的离子扩散和3D电极骨架中的电子传输。此外，插层的可用体积和更容易的电子/离子路径之间的竞争的出现被示出，这决定了它们的面积/比容量。为了完全获得3D结构提供的能量和功率性能的益处，形成电极结构的构件的长度尺度需要以嵌入扩散长度的量级（其为数十微米）进行优化。该研究揭示了优化3D电极设计的非常有用的指导方针以及实现它们以实现上级电池性能的可能制造路线。
Optimized three-dimensional (3D) electrode architectures hold the promise of improving battery performance, a goal that cannot be obtained via conventional laminated structures. This paper reports on the mechanisms by which 3D electrodes enhance battery performance. The diffusion/migration of electrons/ions inside the battery was comprehensively analyzed via a 3D electrochemical model and subsequently validated by experiments on 3D micro-lattice electrodes made by Aerosol Jet printing. Lithium concentration and potential distribution were mapped to correlate battery performance with different shapes, thicknesses, packing density, and porosities. The study revealed that the main factors determining battery performance are ion diffusion in the electrolyte and electron transport in the 3D electrode skeleton. Further, the emergence of a competition between available volume for intercalation and an easier electronic/ionic path was shown, which determined their areal/specific capacities. In order to fully reap the benefits offered by 3D structures for both energy and power performance, the length scale of members forming electrode structures needs to be optimized at a scale of the order of the intercalation diffusion length, which is tens of micrometers. This study reveals highly useful guidelines for optimized 3D electrode designs and the possible manufacturing routes to realize them in order to achieve superior battery performance.