In-situ measurements of electrochemical stress/strain fields and stress analysis during an electrochemical process

•A visual method is proposed to measure electrochemical stress field along diffusion.•In-situ collaborative measurement of mechano-electrochemical parameters are achieved.•Results show electrode experiences unexpected compressive stress and tensile strain.•It points out the stress/strain evolves linearly/nonlinearly with Li+ concentration.•Mechanical constraint and Li+ concentration are competitive to electrochemical stress.