In the present work, LiMn2O4 thin films were prepared by pulsed laser deposition

on stainless steel substrates. The films deposited at 400C and 200mTorr of oxygen

were mainly composed of nano-crystals less than 100nm and their agglomerates.

Three different electrochemical methods including CV, EIS and PITT were applied

to measure the overall Li+-ion diffusion coefficients and charge-transfer resistances

at various potentials from 3.85 to 4.5V. The Li+ diffusion coefficients were in the

range of 10−12 to 10−10cm2/s, depending on the potentials. It was found that the

charge-transfer resistances decreased with the increase of potentials. Especially,

relatively high diffusion coefficients and low charge-transfer resistances were

observed above 4.2V.

Study on Li+-Ion Diffusion in Nano-Crystalline LiMn2O4 Thin Film Cathode

Grown by Pulsed Laser Deposition Using CV, EIS and PITT Techniques.

S.B.Tang, M.O.Lai, L.Lu: Materials Chemistry and Physics, 2008, 111[1], 149-53