Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6601957 | Electrochimica Acta | 2018 | 33 Pages |
Abstract
Cathode materials are the key component and bottleneck that hinders the development of lithium-ion batteries. This work reports the preparation of LiV3O8 nanorods with different levels of Nb doping through a sol-gel process and a subsequent electrospinning method. The electrochemical performance of LiV3O8 as a cathode material was enhanced significantly upon Nb doping. A capacity of 401â¯mAh gâ1 at 0.1C (0.52â¯mAh cmâ2) was observed for LiV2.94Nb0.06O8, which still retained a value of 91â¯mAh gâ1 (0.12â¯mAh cmâ2) at 20 C. The doped cathode also showed excellent cycling stability, retaining 99.7% of its initial capacity after 500 cycles of charge and discharge. The mechanisms for the performance enhancement were investigated using experimental techniques and theoretical analysis based on density functional theory (DFT). It was found the Nb doping could expand the lattice space, reduce the bandgap, increase the intrinsic conductivity, lower the energy barrier of the reaction and promote the absorption and release kinetics of Li-ions. Furthermore, the nanorod morphology which was obtained by electrospinning, could shorten the pathway of Li-ions and provide mechanical stability and is also responsible for the excellent performance.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Liping Wang, Libo Deng, Yongliang Li, Xiangzhong Ren, Hongwei Mi, Lingna Sun, Peixin Zhang, Yuan Gao,