Figure 2.
(a,b) Infrared spectra of different materials and hydrogels; (c) XRD patterns of LMO and Li1.6Mn1.6−xAlxO4; (d,e) XRD patterns of LMO and LMAO-4 after pickling; (f–h) the XPS spectra of Li, Mn and Al by HMAO.
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