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Modified H2V3O8 to Enhance the Electrochemical Performance for Li‐ion Insertion: The Influence of Prelithiation and Mo‐Substitution
ChemSusChem ( IF 7.5 ) Pub Date : 2020-12-18 , DOI: 10.1002/cssc.202002757 Daniela Söllinger 1 , Michael Karl 1 , Günther J. Redhammer 1 , Jürgen Schoiber 1 , Valérie Werner 1 , Gregor A. Zickler 1 , Simone Pokrant 1
ChemSusChem ( IF 7.5 ) Pub Date : 2020-12-18 , DOI: 10.1002/cssc.202002757 Daniela Söllinger 1 , Michael Karl 1 , Günther J. Redhammer 1 , Jürgen Schoiber 1 , Valérie Werner 1 , Gregor A. Zickler 1 , Simone Pokrant 1
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Nanostructured H2V3O8 is a promising high‐capacity cathode material, suitable not only for Li+ but also for Na+, Mg2+, and Zn2+ insertion. However, the full theoretical capacity for Li+ insertion has not been demonstrated experimentally so far. In addition, improvement of cycling stability is desirable. Modifications like substitution or prelithiation are possibilities to enhance the electrochemical performance of electrode materials. Here, for the first time, the substitution of vanadium sites in H2V3O8 with molybdenum was achieved while preserving the nanostructure by combining a soft chemical synthesis approach with a hydrothermal process. The obtained Mo‐substituted vanadate nanofibers were further modified by prelithiation. While pristine H2V3O8 showed an initial capacity of 223 mAh g−1 and a retention of 79 % over 30 cycles, combining Mo substitution and prelithiation led to a superior initial capacity of 312 mAh g−1 and a capacity retention of 94 % after 30 cycles.
中文翻译：
改性H2V3O8以增强锂离子插入的电化学性能：预锂化和Mo取代的影响
纳米结构的H 2 V 3 O 8是一种很有前途的高容量阴极材料，不仅适用于Li +，而且适用于Na +，Mg 2+和Zn 2+的插入。但是，到目前为止，尚未通过实验证明锂+插入的全部理论容量。另外，需要改善循环稳定性。诸如取代或预锂化的修饰是增强电极材料的电化学性能的可能性。在这里，第一次是H 2 V 3 O 8中钒位的取代通过将软化学合成方法与水热工艺相结合，在保持纳米结构的同时实现了钼的制备。所获得的Mo取代的钒酸盐纳米纤维通过预锂化进一步改性。原始的H 2 V 3 O 8在30个循环中显示出223 mAh g -1的初始容量和79％的保留率，同时结合Mo取代和预锂化产生了312 mAh g -1的优异初始容量，并且保留了260 mAh g -1的容量。 30次循环后94％。
更新日期：2021-02-18
中文翻译：
改性H2V3O8以增强锂离子插入的电化学性能：预锂化和Mo取代的影响
纳米结构的H 2 V 3 O 8是一种很有前途的高容量阴极材料，不仅适用于Li +，而且适用于Na +，Mg 2+和Zn 2+的插入。但是，到目前为止，尚未通过实验证明锂+插入的全部理论容量。另外，需要改善循环稳定性。诸如取代或预锂化的修饰是增强电极材料的电化学性能的可能性。在这里，第一次是H 2 V 3 O 8中钒位的取代通过将软化学合成方法与水热工艺相结合，在保持纳米结构的同时实现了钼的制备。所获得的Mo取代的钒酸盐纳米纤维通过预锂化进一步改性。原始的H 2 V 3 O 8在30个循环中显示出223 mAh g -1的初始容量和79％的保留率，同时结合Mo取代和预锂化产生了312 mAh g -1的优异初始容量，并且保留了260 mAh g -1的容量。 30次循环后94％。
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