Dynamics of particle network in composite battery cathodes
Dynamics of particle network in composite battery cathodes
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DOI：
10.1126/science.abm8962
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发表时间：
2022-04-29
期刊：
影响因子：
56.9
通讯作者：
Liu, Yijin
中科院分区：
文献类型：
--
作者：
Li, Jizhou;Sharma, Nikhil;Liu, Yijin
改进复合电池电极需要对活性物质和电极配方进行精细控制。电化学活性粒子通过与周围的导电网络相互作用，发挥能量交换库的作用。我们建立了一个网络演化模型来解释这些粒子的电化学活性和机械损伤之间的调节和平衡。通过对LiNi0.8Mn0.1Co0.1O2基阴极中数千个粒子的X射线相衬全息照相术的统计分析，我们发现局域网络的异质性导致了早期循环中的非同步活动，随后粒子集合体走向同步行为。我们的研究准确地指出了单个颗粒的化学机械行为，并使更好的导电网络设计能够优化所有颗粒在运行过程中的效用。
Improving composite battery electrodes requires a delicate control of active materials and electrode formulation. The electrochemically active particles fulfill their role as energy exchange reservoirs through interacting with the surrounding conductive network. We formulate a network evolution model to interpret the regulation and equilibration between electrochemical activity and mechanical damage of these particles. Through statistical analysis of thousands of particles using x-ray phase contrast holotomography in a LiNi0.8Mn0.1Co0.1O2-based cathode, we found that the local network heterogeneity results in asynchronous activities in the early cycles, and subsequently the particle assemblies move toward a synchronous behavior. Our study pinpoints the chemomechanical behavior of individual particles and enables better designs of the conductive network to optimize the utility of all the particles during operation.