MXene-Derived Defect-Rich TiO2@rGO as High-Rate Anodes for Full Na Ion Batteries and Capacitors

• DOI: 10.1007/s40820-020-00471-9
• Publication Date: 2020-06-16T08:03:03Z
• Authors: Yongzheng Fang; Yingying Zhang; Chenxu Miao; Kai Zhu; Yong Chen; Fei Du; Jinling Yin; Ke Ye; Kui Cheng; Jun Yan; Guiling Wang; Dianxue Cao
• Keywords: Pseudocapacitance; Power density; Sodium-ion battery

Abstract Sodium ion batteries and capacitors have demonstrated their potential applications for next-generation low-cost energy storage devices. These devices's rate ability is determined by the fast sodium behavior in electrode materials. Herein, a defective TiO 2 @reduced graphene oxide (M-TiO @rGO) self-supporting foam constructed via facile MXene decomposition self-assembling process. The employment of parent phase exhibits distinctive advantages, enabling defect engineering, nanoengineering, fluorine-doped metal oxides. As result, M-TiO @rGO shows pseudocapacitance-dominated hybrid mechanism. process leads to high capacity, remarkable ability, superior cycling performance. Significantly, an @rGO//Na 3 V (PO 4 ) full cell @rGO//HPAC capacitor are fabricated demonstrate promising application @rGO. battery presents capacity 177.1 mAh g −1 at 500 mA retention 74% after 200 cycles. delivers maximum density 101.2 Wh kg power 10,103.7 W . At 1.0 A , it displays 84.7% 10,000