Controlled synthesis of single-crystalline Li0.44MnO2 and Li2MnO3 nanoribbons

► Na0.44MnO2 nanoribbons were transferred into Li0.44MnO2 and Li2MnO3 nanoribbons. ► The Li0.44MnO2 are formed when the Na+ in Na0.44MnO2 is replaced by the Li+. ► The formation of Li2MnO3 involves the ion-exchange and oxidation process of LiNO3. ► The formation of Li0.44MnO2 and Li2MnO3 may be a self-sacrificing templating process.