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Advanced functional materials: Rutile hollow matrix carbon fiber cloth composite electrode for flexible sodium ion battery

wallpapers News 2020-08-19

is rich in sodium resources low in cost. Energy storage using sodium ion as energy carrier is considered to be a technology that can be developed on a large scale. However due to the large size of sodium ions flexible wearable devices require unique electrode materials for sodium ion batteries. Design development of flexible electrode materials with high capacity fast charge discharge ability excellent cycling performance is the key to the development of flexible sodium ion batteries. Because of its high mechanical strength high conductivity low cost carbon fiber cloth is an ideal flexible electrode conductive substrate which is widely used in the field of flexible lithium sodium ion batteries. Titanium dioxide (TiO2) is one of the ideal anode materials for sodium ion batteries because of its high theoretical capacity moderate sodium ion insertion potential excellent structural stability pseudocapacitance. In order to keep good electrochemical performance of flexible sodium ion battery under deformation it is difficult to construct flexible TiO2 Electrode with higher mechanical strength.

Associate Professor Wang XianFen of Qingdao University Professor Zhao Xiusong of Queensl University cooperated to grow rutile titanium dioxide hollow matrix on carbon fiber cloth by simple hydrothermal etching method. The integrated electrode material was applied to flexible sodium ion battery showed excellent electrochemical performance at high rate. The flexible whole cell assembled with this electrode still has excellent electrochemical stability under deformation. Integration of preparation of

H-TiO2@CFC The electrode can be used as negative electrode of sodium ion battery without binder. In the half cell test the specific capacity of 103.9 mahg-1 is still obtained at high rate of 50c the capacity retention rate is as high as 95.8% after 600 cycles at the rate of 10C. This excellent electrochemical performance is attributed to H-TiO2@CFC The electrode has a unique structure. The carbon fiber cloth not only improves the conductivity of the electrode but also promotes the transport of sodium ions. TiO2 hollow matrix can increase the contact between sodium ions TiO2 shorten the transport path of sodium ions. The results of in-situ XRD show that the lattice parameters of TiO2 change very little during the charge discharge process there is no obvious peak shift in in-situ XRD. The conversion between Ti4 Ti3 can be found by non in situ XPS during the charge discharge process which is of great significance to reveal the mechanism of sodium deintercalation. with H-TiO2@CFC The composite electrode was used as the negative electrode sodium vanadate phosphate (na3v2 (PO4) 3) was used as the positive electrode to assemble the flexible full cell which had excellent electrochemical performance higher energy density (158.6 whkg-1). Compared with other sodium ion full cell reported in the literature it had greater advantages. The flexible battery assembled by the flexible composite electrode has excellent electrochemical performance bending resistance which provides a feasible idea for the practical application of flexible energy storage devices.

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