TY - JOUR
T1 - Composite electrode ink formulation for all solid-state batteries
AU - Shen, Fengyu
AU - Dixit, Marm B.
AU - Zaman, Wahid
AU - Hortance, Nicholas
AU - Rogers, Bridget
AU - Hatzell, Kelsey B.
N1 - Funding Information:
This material is based upon work supported by the National Science Foundation under grant No. 1847029 (W.Z.) and No. 1727863 (M.D.). The authors acknowledge the Vanderbilt Institute of Nanoscience and Engineering (VINSE) for access to their shared characterization facil- ities. The authors acknowledge support from the Ralph E. Powe Junior Faculty Enhancement Award.
Publisher Copyright:
© The Author(s) 2019.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
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U2 - 10.1149/2.0141914jes
DO - 10.1149/2.0141914jes
M3 - Article
AN - SCOPUS:85072942019
SN - 0013-4651
VL - 166
SP - A3182-A3188
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 14
ER -