Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6464984 | Chemical Engineering Journal | 2018 | 7 Pages |
â¢3D chestnut shell-like Li4Ti5O12 hollow sphere is fabricated.â¢Li4Ti5O12 hollow sphere displays remarkable capacitance over 2000 cycle.â¢Aqueous asymmetric supercapacitor is constructed based on Li4Ti5O12 and N doped GO.
As promising electrode materials in supercapacitor, metal oxides have attracted significant attention recently. At present, it is highly desirable but remains challenging to prepare three-dimensional (3D) metal oxides hollow materials for further improving the performance of supercapacitors. Herein, 3D chestnut shell-like Li4Ti5O12 hollow sphere is successfully fabricated by using an effective hydrothermal strategy. Owing to the unique structural feature and the desirable chemical composition, Li4Ti5O12 hollow sphere displays a remarkable capacitance of 653.22Â F/g at 1Â A/g and keeps 88.56% over 4000Â cycle. Furthermore, one aqueous asymmetric supercapacitor (ASC) is constructed based on Li4Ti5O12 and N-doped graphene oxide (NGO) which is synthesized by a facile burning method. The Li4Ti5O12//NGO ASC shows an energy density of 26.15Â Wh/kg at power density of 799.83Â W/kg, and yet keeps 14.45Â Wh/kg even at 8.01Â kW/kg. This strategy may offer a versatile idea of tailoring new type of 3D metal oxides hollow materials and opens the possibility for using in high energy storage device.
Graphical abstractDownload high-res image (109KB)Download full-size imageWe have successfully synthesized 3D Li4Ti5O12 hollow sphere for high-performance.