Abstract
Ultrathin atomic layer deposition (ALD) coatings enhance the performance of lithium-ion batteries (LIBs). Previous studies have demonstrated that cathode powders coated with metal oxides with thicknesses of to grown using wet chemical techniques improved LIB performance. In this study, powders were coated with conformal ALD films with thicknesses of only to established using two ALD cycles. The coated powders exhibited a capacity retention of 89% after 120 charge–discharge cycles in the 3.3–4.5 V (vs ) range. In contrast, the bare powders displayed only a 45% capacity retention. ALD films coated directly on the composite electrode also produced improved capacity retention. This dramatic improvement may result from the ultrathin ALD film acting to minimize Co dissolution or reduce surface electrolyte reactions. Similar experiments with ultrathin ZnO ALD films did not display enhanced performance.
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