In this paper, LiNi Mn O (LNMO) coated with various amount of RGO (0, 0.5, 1, and 2 wt%) were successfully synthesized 0.5 1.5 4 by solid-state assembly method. The physical properties of LNMO and RGO-LNMO were investigated by x-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), and transmission electron microscope (TEM). XRD and Raman spectrum exhibit all samples that are well crystallized in P4 32 space group; SEM and TEM results show the uniform size of the particles is 1 ~ 2 μm with octahedral structure, and LNMO is successfully wrapped by RGO. The electrochemical properties of RGO-LNMO visibly improved compared with the bared LNMO, especially at high current rate, which has been proven by galvanostatic charge-discharge test, cycle performance test, and rate capacity test. For example, the bared LNMO delivers a −1 −1 discharge capacity of 39.2 mAh g at 10 C rate, while that of 1-wt% RGO-LNMO was 86.2 mAh g , which was approximately 2.5 times more than that of the bared LNMO. At 10 C rate after 1000 cycles, 2-wt% RGO-LNMO delivers a discharge capacity of −1 −1 50.6 mAh g with a capacity retention of 86.7%, while the bared LNMO delivers a
Ionics – Springer Journals
Published: Jun 2, 2018
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