Spinel LiMn 2 O 4 cathodes were coated with 1 mol% YF 3 . X-ray diffraction (XRD) analyses showed that Y and/or F did not enter the lattice of the LiMn 2 O 4 crystal. Transmission electron microscopy (TEM) showed that a compact YF 3 layer of 5-20 nm in thickness was coated onto the surface of LiMn 2 O 4 particles. Scanning electron microscopy (SEM) observation showed that the YF 3 coating caused the agglomeration of LiMn 2 O 4 particles. The cycling test demonstrated that the YF 3 coating can improve the electrochemical performance of LiMn 2 O 4 at both 20 and 55°C. Moreover, YF 3 -coated LiMn 2 O 4 exhibited an improved rate capability compared with the uncoated one at high rates over 5C. The immersion test in electrolytes showed that YF 3 -coated LiMn 2 O 4 is more erosion resistant than the uncoated one.
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