Composite Electrode Ink Formulation for All Solid-State Batteries
Composite Electrode Ink Formulation for All Solid-State Batteries
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DOI：
10.1149/2.0141914jes
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发表时间：
2019-09-18
影响因子：
3.9
通讯作者：
Hatzell, Kelsey B.
中科院分区：
文献类型：
--
作者：
Shen, Fengyu;Dixit, Marm B.;Hatzell, Kelsey B.
固态电池采用复合电极，其包含固体离子导体、固体活性材料、导电添加剂和粘合剂。电极微结构与常规电池中的电极根本不同，因为孔区域是离子阻挡的。虽然对如何将锂金属与无机电解质整合有广泛的研究，但对如何将电极与无机电解质整合的知识较少。溶液处理技术是可扩展制造的理想选择，并且依赖于创建结合固体材料、粘合剂和溶剂的油墨。油墨工程依赖于为所需的涂布工艺定制流体学（流变学）、聚集行为和稳定性。在这项工作中，我们系统地探讨了两种油墨成分的作用：（1）粘合剂，（2）溶剂对电极微结构的形成。当使用高粘度溶剂时，钛酸锂阳极实现容量从1.5mAh/g和3 mAh/g到9 mAh/g和>= 12 mAh/g的几乎3- 4倍的增加。粘结剂在决定电极性能方面比表面粘附性能起更大的作用。具有良好分散成分的油墨导致更有效的电极用于电荷存储。(C)作者（S）2019由ECS发布。
Solid-state batteries employ composite electrodes which contain a solid ion conductor, a solid active material, a conductive additive, and a binder. The electrode microstructure fundamentally differs from electrodes in conventional batteries because the pore region is ion blocking. While there is extensive research on how to integrate a lithium metal with inorganic electrolytes, there is less knowledge on how an electrode can be integrated with an inorganic electrolyte. Solution processing techniques are ideal for scalable manufacturing and rely on creating an ink which combines the solid material, a binder, and solvent. Ink engineering relies on tailoring the fluidics (rheology), aggregation behavior, and stability for a desired coating process. In this work, we systematically probe the role of two ink constituents: the (1) binder, and (2) solvent on electrode microstructure formation. Lithium titanate anodes achieve nearly a 3-4X increase in capacity from 1.5 mAh/g and 3 mAh/g to 9 mAh/g and >= 12 mAh/g when a high viscosity solvent is employed. The binder plays a larger role in dictating performance of the electrode than surface adhesion properties. Inks with well dispersed constituents led to more effective electrodes for charge storage. (C) The Author(s) 2019. Published by ECS.