中文摘要：

通过水热法合成钒系磷酸盐单斜系VPO4·H2O,通过氧化作用得到ε-VOPO4纳米片。ε-VOPO4纳米片在嵌锂两个过程中与超过1 mol的锂原子发生反应。对制备的ε-VOPO4纳米片进行XRD测试,得到晶胞参数为α=7.2588（4）А;b=6.8633（2）А;c=7.2667（4）А。结果表明,制备的ε-VOPO4纳米片厚度为200 nm且结晶度完美。电化学性能表征结果表明,制备的单斜系ε-VOPO4纳米片在高电流密度下表现出优越的电化学性能,在电流密度为0.09 m A/cm^2情况下的初始放电容量为230.3 m A·h/g。初始放电后,在电流密度为0.6 mA/cm^2下经过1000次循环后其容量保持率为73.6%（放电窗口为2.0～4.3 V）。

英文摘要：

Vanadium （III） phosphate monoclinic VPO4·H2O was synthesized hydrothermally. The ε-VOPO4 nanosheets, formed by the oxidative de-intercalation of protons from monoclinic VPO4·H2O, can reversibly react with more than 1 mol lithium atoms in two steps. Crystal XRD analysis revealed that the structure of the ε-VOPO4 nanosheets is monoclinic with lattice parameters of α=7.2588（4） A, b=6.8633（2） A and c=7.2667（4） A. The results show that the ε-VOPO4 nanosheets have a thickness of 200 nm and uniform crystallinity. Electrochemical characterization of the ε-VOPO4 monoclinic nanosheets reveals that they have good electrochemical properties at high current density, and deliver high initial capacity of 230.3 mA· h/g at a current density of 0.09 mA/cm2. Following the first charge cycle, reversible electrochemical lithium extraction/insertion at current density of 0.6 mA/cm2 affords a capacity retention rate of 73.6% （2.0？4.3 V window） that is stable for at least 1000 cycles.