High Active Material Loading in All-Solid-State Battery Electrode via Particle Size Optimization
High Active Material Loading in All-Solid-State Battery Electrode via Particle Size Optimization
复制标题
基于粒径优化的全固态电池电极高活性材料加载
DOI：
10.1002/aenm.201902881
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发表时间：
2019-12-03
影响因子：
27.8
通讯作者：
Ceder, Gerbrand
中科院分区：
文献类型：
--
作者：
Shi, Tan;Tu, Qingsong;Ceder, Gerbrand
全固态电池复合电极中活性物质含量低是目前全固态电池能量密度低的主要原因之一。在这项工作中，通过建模和实验证明，在高阴极负载的情况下，固态复合材料中阴极材料的利用率高度依赖于阴极与固态导体的粒度比。通过实验数据证实的建模表明，通过增加阴极与导体颗粒尺寸的比率，可以实现更高的阴极负载，从而增加能量密度。这些结果与离子渗流是冷压固态阴极材料中的限制因素一致，并为如何提高固态电池复合阴极的能量密度提供了具体指导。通过减小固体电解质颗粒尺寸和增加阴极活性材料颗粒尺寸，能够在实验上实现具有高阴极利用率的超过50体积%的阴极活性材料负载，这表明通过简单的混合和压制方法可实现商业上相关的能量密集的阴极复合材料。
Low active material loading in the composite electrode of all-solid-state batteries (SSBs) is one of the main reasons for the low energy density in current SSBs. In this work, it is demonstrated with both modeling and experiments that in the regime of high cathode loading, the utilization of cathode material in the solid-state composite is highly dependent on the particle size ratio of the cathode to the solid-state conductor. The modeling, confirmed by experimental data, shows that higher cathode loading and therefore an increased energy density can be achieved by increasing the ratio of the cathode to conductor particle size. These results are consistent with ionic percolation being the limiting factor in cold-pressed solid-state cathode materials and provide specific guidelines on how to improve the energy density of composite cathodes for solid-state batteries. By reducing solid electrolyte particle size and increasing the cathode active material particle size, over 50 vol% cathode active material loading with high cathode utilization is able to be experimentally achieved, demonstrating that a commercially-relevant, energy-dense cathode composite is achievable through simple mixing and pressing method.