Visualizationof Functional Components in a Lithium Silicon Titanium Phosphate–NaturalGraphite Composite Anode
2020
Here,
a multimodal scanning probe microscopy study of a composite anode
with a dispersed lithium silicon titanium phosphate (LSTP) lithium
ion conductor for all-solid-state batteries is presented. Using electrochemical
strain microscopy (ESM) and lateral force microscopy (LFM), electromechanical
response and friction force dependence as a function of the measurement
parameters such as the tip loading force and AC drive voltage are
analyzed. The sensitivities of friction force and ESM amplitude are
found to be valid markers to identify each component in the composite
anode. Furthermore, the distribution of active ionic sites of lithium
ions is visualized in the comingled region of LSTP and binder materials
based on Pearson’s correlation analysis between nanoscale ESM
and LFM results. With the suggested technique, various components
of composite electrodes can be directly visualized and distinguished
in ambient conditions, with their properties being measured simultaneously.
These methods will provide insights into the optimal conditions of
composite electrodes and allow for developing next-generation all-solid-state
batteries.
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