Reduced
Grain Boundary Resistance by Surface Modification
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Abstract
Interfacial
resistance is one of the severe problems in composite
electrodes of all solid state batteries (ASSBs), especially oxide-type
ASSBs. Conflicts between poor sinterability and possible unfavorable
reaction with active materials limit applicable materials and processes.
In this report, a novel approach is proposed to decrease grain boundary
resistance among nonsintered solid electrolyte particles. The concept
is successfully demonstrated, and the nonsintered grain boundary resistance
of a highly conducting solid electrolyte (Li<sub>1.3</sub>Al<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub>) was suppressed by being
coated with poorly conducting solid electrolyte (Li<sub>2</sub>SiO<sub>3</sub>). Increased total conductivity and variation of apparent
activation energy are well explained from the viewpoint of defect
chemistry