Gd3+-doped NaTi2(PO4)3@C negative material with superior Na-storage property for sodium-ion batteries

•The carbon coating and Gd3+-doping were simultaneously applied to promote the electrical conductivity of NaTi2(PO4)3 via a simple sol-gel approach.•The electronic conductivity of NaTi2(PO4)3 anode was greatly improved by the carbon coating and Gd3+-doping.•The Gd3+-doped NaTi2−xGdx(PO4)3@C nanocomp...

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