The rational design of carbon coated Fe2(MoO4)3 nanosheets for lithium-ion storage with high initial coulombic efficiency and long cycle life,Nanoscale Advances

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The rational design of carbon coated Fe2(MoO4)3 nanosheets for lithium-ion storage with high initial coulombic efficiency and long cycle life
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-03-09 , DOI: 10.1039/d0na00122h
Chennan Liang ₁ , Yuanxue Tao ₁ , Dekang Huang ₁ , Shu Li ₁ , Feifei Cao ₁ , Yanzhu Luo ₁ , Hao Chen ₁

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Binary metal oxides are potential anode materials for lithium-ion storage due to their high theoretical specific capacities. However, the practical applications of metal oxides are limited due to their large volume changes and sluggish reaction kinetics. Herein, carbon coated Fe₂(MoO₄)₃ nanosheets are prepared via a simple method, adopting urea as the template and carbon source. The carbon coating on the surface helps to elevate the conductivity of the active material and maintain structural integrity during the lithium storage process. Combining this with a catalytic effect from the generated Fe, leading to the reversible formation of a solid electrolyte interface layer, a high initial coulombic efficiency (>87%) can be obtained. Based on this, the carbon coated Fe₂(MoO₄)₃ nanosheets show excellent rate capability (a reversible discharge capacity of 983 mA h g⁻¹ at 5 A g⁻¹) and stable cycling performance (1376 mA h g⁻¹ after 250 cycles at 0.5 A g⁻¹ and 864 mA h g⁻¹ after 500 cycles at 2 A g⁻¹). This simple in situ carbonization and template method using urea provides a facile way to optimize electrode materials for next-generation energy storage devices.

中文翻译：

碳包覆Fe2(MoO4)3纳米片的合理设计用于锂离子存储，具有高初始库仑效率和长循环寿命

二元金属氧化物由于其高理论比容量而成为锂离子存储的潜在负极材料。然而，金属氧化物的实际应用由于其体积变化大和反应动力学缓慢而受到限制。在此，碳包覆的 Fe ₂ (MoO ₄ ) ₃纳米片通过以下方法制备：一种简单的方法，采用尿素作为模板和碳源。表面的碳涂层有助于提高活性材料的导电性并在锂存储过程中保持结构完整性。将其与生成的 Fe 的催化作用相结合，导致固体电解质界面层的可逆形成，可以获得高的初始库仑效率（>87%）。基于此，碳包覆的Fe ₂ (MoO ₄ ) ₃纳米片表现出优异的倍率性能（ 5 A g ^-1时的可逆放电容量为983 mA hg ^-1）和稳定的循环性能（250次循环后为1376 mA hg ^-1在 0.5 A g ^-1和 864 mA hg^-1在 2 A g^-1下 500 次循环后）。这种使用尿素的简单原位碳化和模板方法为优化下一代储能设备的电极材料提供了一种简便的方法。

更新日期：2020-04-24

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