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首页> 外文会议>Meeting of the Electrochemical Society;International Meeting on Chemical Sensors >Digital Deposition of Graphite Electrodes and 3D Microstructure Optimisation
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Digital Deposition of Graphite Electrodes and 3D Microstructure Optimisation

机译：石墨电极的数字沉积和3D微结构优化

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Water-based high viscosity graphite inks for automated digital deposition of Li-ion battery electrodes have been studied. The flow behaviour and visco-elastic properties of the inks were optimised for a digitally controlled additive manufacturing deposition method and high energy electrodes. A rheology modifier was introduced as an immiscible secondary fluid to control the flow behaviour of these inks. Through optimisation of the formulation, graphite electrodes with high mass loadings were achieved. Depending upon the rheology, both patterned or homogeneously coated electrodes were successfully deposited. The influence of the ink formulation upon the microstructure and electrochemical performance of the prepared anodes is discussed. 3D microstructure was analysed by 2-D electrode cross sectioning and scanning electron microscopy (SEM). It was observed that with an increase of the rheology modifier the alignment of the graphite particles, as well as the distribution of the conductive additive was altered considerably. The dispersion of the conductive additive improved up to 1% additive with greater alignment of the graphite particles, however at 10% additive clumping of the graphite particles was observed. The electrochemical performance of the different electrode microstructures was investigated through electrochemical cycling and impedance spectroscopy. Figure 1 shows the cross-sectional microstructure of the electrodes with 0% and 10% rheology modifier.
机译：研究了用于自动化数字沉积的水基高粘度石墨墨水。针对数字控制的添加剂制造沉积方法和高能量电极进行了优化了油墨的流动行为和粘弹性。引入流变改性剂作为不混溶的二级流体以控制这些油墨的流动行为。通过优化配方，实现了具有高批量载荷的石墨电极。根据流变学，成功沉积图案化或均匀涂覆的电极。讨论了油墨制剂对制备阳极的微观结构和电化学性能的影响。通过2-D电极横截面和扫描电子显微镜（SEM）分析3D微观结构。观察到，随着流变改性剂的增加，石墨颗粒的取向，以及导电添加剂的分布显着改变。导电添加剂的分散改善高达1％的添加剂，较大的石墨颗粒对准，然而观察到石墨颗粒的10％添加剂块。通过电化学循环和阻抗光谱研究了不同电极微结构的电化学性能。图1显示了具有0％和10％流变改性剂的电极的横截面微结构。

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