In situ atomic force microscopy analysis of morphology and particle size changes in lithium iron phosphate cathode during discharge.
Li-ion batteries offer great promise for future plug-in hybrid electric vehicles (PHEVs) and pure electric vehicles (EVs). One of the challenges is to improve the cycle life of Li-ion batteries which requires detailed understanding of the aging phenomenon. In situ techniques are especially valuable to understand aging since it allows monitoring the physical and chemical changes in real time. In this study, in situ atomic force microscopy (AFM) is utilized to study the changes in morphology and particle size of LiFePO4 cathode during discharge. The guidelines for in situ AFM cell design for accurate and reliable measurements based on different designs are presented. The effect of working electrode to counter electrode surface area ratio on cycling data of an in situ cell is also discussed. Analysis of the surface area change in LiFePO4 particles when the cell was cycled between 100% and 70% state of charge is presented. Among four particles analyzed, surface area increase of particles during Li intercalation of LiFePO4 spanned from 1.8% to 14.3% indicating the inhomogeneous nature of the cathode surface.
Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics, The Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210, United States.
Dervis Emre
DE
Demirocak
Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics, The Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210, United States. Electronic address: Bhushan.2@osu.edu.
Bharat
B
Bhushan
D011211:Electric Power Supplies; D004566:Electrodes; D004867:Equipment Design; D007501:Iron / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D010316:Particle Size; D010710:Phosphates / Q000737:chemistry*
C473349:LiFePO4; D010710:Phosphates; D008094:Lithium; D007501:Iron
Aging; Atomic force microscopy; In situ electrochemical cell; Li-ion battery; LiFePO(4); Rate capability