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Figure 3 in the above article contained an erroneous spectra in part b. The corrected figure is shown below in full:

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Figure 3. a–b) X-ray photoelectron spectroscopy (XPS) profiles of the core-shell (HSLiNi0.54 Co0.12 Mn0.34 O2) particles before etching (a) and after etching to depths of 5, 30, 60 and 90 nm (b).

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The authors apologize for any inconvenience caused.