Abstract
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 mA h g−1 at 0.2, 1, 2, 5 and 10 C, respectively) and a high stable capacity of 440 and 313 mA h g−1 up to 300 cycles at 0.2 and 5 C, respectively.
摘要
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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21476019 and 21676017).
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Qin P, Zheng YZ and Tao X conceived the idea of the project. Qin P conducted the material synthesis, structural characterizations and electrochemical test. Lv X and Li C helped to discuss partial experimental data. Qin P wrote the paper with support from Zheng YZ. All authors contributed to the general discussion.
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Qin, P., Lv, X., Li, C. et al. Morphology inheritance synthesis of carbon-coated Li3VO4 rods as anode for lithium-ion battery. Sci. China Mater. 62, 1105–1114 (2019). https://doi.org/10.1007/s40843-019-9424-9
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DOI: https://doi.org/10.1007/s40843-019-9424-9