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Electrochemical strain microscopy (ESM) is a scanning probe microscopy (SPM) method in whichthe local electrodiffusion is probed via application of AC voltage to the SPM tip and registration ofresulting electrochemical strain. Here, we implemented ESM to measure local strain in bulkLiMn2O4 cathodes of a commercial Li-battery in different states of charge to investigate distributionof Li-ion mobility and concentration. Ramped AC ESM imaging and voltage spectroscopywere used to find the most reliable regime of measurements allowing separating and diminishingdifferent contributions to ESM. This is not a trivial task due to complex geometry of the sampleand various obstacles resulting in less predictable contributions of different origins into ESMresponse: electrostatic tip surface interactions, charge injection, electrostriction, and flexoelectricity.Understanding and control of these contributions is an important step towards quantitativeinterpretation of ESM data

Characterization of LiMn2O4 cathodes by electrochemical strain microscopy