To address the issue of low conductivity in lithium vanadium phosphate,Li3V2(PO4)3/C powder was synthesized via a sol-gel method using lithium nitrate,ammonium metavanadate,and ammonium dihydrogen phosphate as raw materials,with glucose serving as both a complexing agent and carbon source.A small amount of surfactant sodium dodecylbenzene sulfonate (SDBS) was employed as a sodium source for Na+ doping modification of Li3V2(PO4)3/C.The results demonstrated that appropriate doping with SDBS as the sodium source enabled better dispersion of Li3-xNax(PO4)3 particles within the residual carbon network,significantly enhancing the material's rate performance.The discharge capacity remained 52.5mAh/g even at 100C.After 400 cycles at 60C,the capacity retention still reached as high as 97.9mAh/g.Cyclic voltammetry and electrochemical impedance spectroscopy tests revealed that appropriate Na+ doping increased the Li+ diffusion coefficient,while the dispersive effect of SDBS improved ionic conductivity,collectively contributing to the superior electrochemical performance of Li2.97Na0.03V2(PO4)3/C.
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基金资助
安徽省自然科学基金项目(1608085QE97)
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