利用简单精确的几何优化方案量身定制三维电池设计

Kaito Miyamoto*, 
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引用次数: 0

摘要

在快速发展的物联网(IoT)社会中,对高面值能量密度的微型电池的需求激增。三维(3D)电池作为一种有望提高磁场能量密度的策略备受关注。三维电池的特点是通过改变正负电极的空间布局,使电极厚度与离子传输距离脱钩,从而超越了传统的平行板配置。这样就可以在不增加内阻的情况下容纳更多的活性材料。然而,确定最佳三维几何形状是一项复杂的任务,因为它取决于可印刷材料、制造设备的分辨率以及电池的使用情况,这就构成了一个多目标优化问题。为了克服这一难题,我们提出了一种确定最佳三维微型电池几何形状的新方法。我们的创新方法涉及三维电池优化系统,该系统集成了自动几何生成器和快速准确的性能模拟器。这种方法首次发现了与材料和放电电流相关的最佳几何形状。我们成功地将这一优化方案应用于两个标准电极对(LiFePO4/Li4Ti5O12 和 LiNi0.5Mn0.3Co0.2O2/石墨),显示出能量密度的显著提高(比目前最先进的几何形状高 30%-40%),尤其是在高电流条件下。这些发现强调了为各种物联网应用量身定制电池的重要性,并展示了我们的方法在实现此类设计方面的潜力。
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Tailor-Made Design of Three-Dimensional Batteries Using a Simple, Accurate Geometry Optimization Scheme

In the rapidly evolving Internet of Things (IoT) society, the demand for microbatteries with high areal energy density is surging. As a promising strategy to enhance areal energy density, three-dimensional (3D) batteries have attracted attention. The feature of 3D batteries is the decoupling of the electrode thickness from the ion-transport distance through the modification of the spatial arrangement of the positive and negative electrodes beyond the conventional parallel plates configuration. This allows for the accommodation of a larger amount of active materials without increasing internal resistance. However, identifying the optimal 3D geometry is a complex task, as it depends on printable materials, the resolution of the fabrication equipment, as well as battery usage, which constitutes a multiobjective optimization problem. To overcome this challenge, we propose a novel approach to determine the optimal 3D microbattery geometry. Our innovative method involves a 3D battery optimization system, which integrates an automatic geometry generator with a quick and accurate performance simulator. This approach allows, for the first time, the discovery of material- and discharge-current-dependent optimal geometries. We successfully apply this optimization scheme to two standard electrode pairs (LiFePO4/Li4Ti5O12 and LiNi0.5Mn0.3Co0.2O2/graphite), demonstrating a significant increase in energy density (30%–40% greater than the current state-of-the-art geometry), particularly under high current conditions. These findings underscore the importance of tailor-made batteries for diverse IoT applications and showcase the potential of our approach in realizing such designs.

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来源期刊
CiteScore
3.70
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0.00%
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期刊介绍: ACS Physical Chemistry Au is an open access journal which publishes original fundamental and applied research on all aspects of physical chemistry. The journal publishes new and original experimental computational and theoretical research of interest to physical chemists biophysical chemists chemical physicists physicists material scientists and engineers. An essential criterion for acceptance is that the manuscript provides new physical insight or develops new tools and methods of general interest. Some major topical areas include:Molecules Clusters and Aerosols; Biophysics Biomaterials Liquids and Soft Matter; Energy Materials and Catalysis
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