Morphology inheritance synthesis of carbon-coated Li3VO4 rods as anode for lithium-ion battery

形貌遗传法制备碳包覆棒状Li3VO4锂离子电池负极材料（英文）

Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance. In this work, we fabricate carbon coated Li3VO4(C@LVO) rods by a facile morphology inheritance route. The as-prepared C@LVO rods are 400–800 nm in length and 200–400 nm in diameter,and orthorhombic phase with V5+. The unique core-shell rods structure greatly improves the transport ability of electrons and Li+. Such C@LVO submicron-rods as anode materials exhibit excellent rate capability(a reversible capability of 460,438, 416, 359 and 310 m A h g^-1 at 0.2, 1, 2, 5 and 10 C, respectively) and a high stable capacity of 440 and 313 m A h g^-1 up to 300 cycles at 0.2 and 5 C, respectively.

Li3VO4作为一种能够应用到储能装置上的脱嵌型负极材料展现了巨大的应用潜力.形貌调控和表面修饰是提升Li3VO4电化学性能非常有效的方法.本文通过一种形貌遗传法制备了碳包覆的棒状Li3VO4. SEM和TEM结果表明这种碳包覆棒状Li3VO4材料的长度约为400–800 nm,直径约为200–400 nm. XRD和XPS结果证明碳包覆棒状Li3VO4仍然是正交相,其中V的价态为+5.由于其独特的核壳结构,它的电子和锂离子的传输能力都有较大的提升.因此,碳包覆棒状Li3VO4展现出优异的电化学性能,在0.2, 1, 2, 5和10 C的电流密度下分别有460, 438, 416, 359和310 mA h g^-1的可逆容量,在0.2和5 C的电流密度下循环300圈后仍然具有440和313 mA h g^-1的可逆容量.