LiV3O8在Li2SO4水溶液中的电化学性能

采用低温固相法合成了具有纳米结构的LiV₃O₈材料.扫描电子显微镜（SEM）及透射电子显微镜（TEM）测试显示该材料具有纳米结构.X射线衍射（XRD）表明该材料属于单斜晶系,P2₁Im空间群.并采用循环伏安法（CV）及电化学阻抗谱图测试对该材料在1、2 mol·L^-1Li₂SO₄水溶液及饱和Li₂SO₄水溶液中的电化学行为进行了研究.结果表明,LiV₃O₈在饱和Li₂SO₄水溶液中具有最好的电化学性能.以LiV₃O₈作为负极材料,LiNi_1/3Co_1/3Mn_1/3O₂作为正极材料,饱和Li₂SO₄水溶液作为电解液组成了水性锂离子电池,进行恒流充放电测试,结果表明,在0.5C(1C=300 mA·g^-1)的充放电倍率下,该水性锂离子电池的首次放电比容量为95.2 mAh·g^-1,循环100次后仍具有37.0 mAh·g^-1的放电比容量.

Electrochemical Behavior of LiV3O8 in Aqueous Li2SO4 Solution

Nanostructured LiV3O8 powder was synthesized by a low-temperature solid-state method.Scanning election microscopy (SEM) and transmission electron microscopy (TEM) show that the as-prepared material is composed of nanostructured particles.X-ray diffraction (XRD) measurements indicate that the as-prepared material has a monoclinic structure with a space group of P21/m.The electrochemical properties of the LiV3O8 electrodes in 1 mol· L-1 Li2SO4,2 mol· L-1 Li2SO4,and saturated Li2SO4 aqueous electrolytes were studied using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in this work.The results show that the LiV3O8 electrode in the saturated Li2SO4 electrolyte has the best electrochemical properties.An aqueous rachargeable lithium battery (ARLB) containing a LiV3O8 anode,a LiNi1/3Co1/3Mn1/3O2 cathode,and a saturated Li2SO4 electrolyte was fabricated.The battery delivered an initial capacity of 95.2 mAh· g-1 and retained a capacity of 37.0 mAh· g-1 after 100 cycles at a charge-discharge rate of 0.5C (1C=300 mA· g-1).