High performance of Bi3+ and Cl− co-doped Li3V2(PO4)3 as cathode for lithium-ion batteries. Issue 5 (26th March 2020)

• Record Type: Journal Article
• Authors: Zhu, DongZhi; Di, YuLi; Chai, ZongJian; Zhu, XiaoDong; Chen, Shanhua; Deng, Lin
• Is Part Of: Surface innovations. Volume 8:Issue 5(2020)
• Page Start: 270
• Page End: 278
• Publication Date: 2020-03-26
• Subjects: batteries -- carbon -- energy storage; Surfaces (Technology) -- Periodicals; Surfaces (Physics) -- Periodicals; 620.44
• DOI: 10.1680/jsuin.20.00001
• Languages: English
• ISSNs: 2050-6260

Abstract

Abstract : Bismuth (III) (Bi 3+ ) and chloride (Cl − ) ion co-doped Li3 V1·97 Bi0·03 (PO4 )3− x Cl x /carbon (C) compounds ( x = 0·03, 0·05, 0·07, 0·09) were prepared by way of a simple sol–gel method. The X-ray diffraction patterns proved that a small amount of bismuth (III) and chloride ion doping does not change the crystal structure of lithium vanadium phosphate (Li3 V2 (PO4 )3 ). Charge/discharge results showed that bismuth (III) and chloride ion co-doped samples exhibited higher initial capacities than lithium vanadium phosphate/carbon. Li3 V1·97 Bi0·03 (PO4 )2·95 Cl0·05 /carbon demonstrated the highest capacity of 188 mAh/g at 0·1 C. The cycling performance at 1 C showed that the capacity retention of Li3 V1·97 Bi0·03 (PO4 )2·95 Cl0·05 /carbon reaches 81·31% after 300 cycles. Electrochemical impedance spectroscopy and cyclic voltammetry testing indicated that Li3 V1·97 Bi0·03 (PO4 )2·95 Cl0·05 has the smallest charge-transfer resistance and the largest lithium-ion (Li + ) diffusion coefficient. The improvement can be assigned to the enhanced kinetics of lithium ions, reduction in polarization and decreased charge-transfer resistance of the electrode.