The influence of Sn substitution in LiMn2O4 thin films as a cathode has been studied via solution deposition to improve the electrochemical performance of thin film lithium batteries. LiSn0.025Mn1.95O4 thin films showed the most promising performance, i.e. a high capacity retention of 77% at 10 C after the 500th cycle, due to the increased average Mn valence state. The thin films of LiSnx/2Mn2-xO4 (x ≥ 0.10) showed significant precipitation of SnO2 and SnO after the cycling evaluation.
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The authors acknowledge the financial support from Korea Institute of Science and Technology, the project of “Development on Functional Thin Film Materials for Driving USN Sensors” and for the XAS measurements in the 3C1 B/L at PLS.
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