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首页> 外文期刊>RSC Advances >Influence of the diffusion-layer thickness during electrodeposition on the synthesis of nano core/shell Sn–O–C composite as an anode of lithium secondary batteries
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Influence of the diffusion-layer thickness during electrodeposition on the synthesis of nano core/shell Sn–O–C composite as an anode of lithium secondary batteries

机译：电沉积期间扩散层厚度对纳米芯/壳SN-O-C复合材料合成的影响，作为锂二次电池阳极

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Electrodeposition was conducted from an organic carbonate solvent via the potentiostatic technique through three consecutive steps in order to synthesise Sn–O–C composite, which delivered a discharge capacity of 596 mA h g _(of Sn) ~(?1) after 50 cycles. However, the composite anode suffered from a significantly low initial discharge capacity, delivering a discharge capacity of 79 mA h g _(of Sn) ~(?1) until the 5th cycle. It was deduced that the improbably low initial capacity was induced by the deposition of Li-rich compounds, which were formed by electrolyte decomposition accompanied by the reduction product of supporting electrolyte salts during the electrodeposition process, on the surface layer. In order to improve the poor initial capacity, we modified the chemical composition of the surface layer by means of implementing the agitation of the electrolyte during the deposition process. This gave rise to varying the diffusion-layer thickness during the deposition process due to the enhancement of convection by movement of the electrolyte itself. As a result, we achieved improvement of the initial discharge capacity, delivering 572 mA h g _(of Sn) ~(?1) at the 1st cycle and 586 mA h g _(of Sn) ~(?1) at the 50th cycle. It was revealed that the surface layer was composed of a decomposition product of the organic carbonate solvent. Furthermore, a smaller particle size of the Sn–O–C composite was obtained via electrolyte agitation, giving rise to homogeneous shell formation on the Sn compound core. Herein, we thoroughly examined the influence of varying diffusion-layer thickness during the deposition process on the properties of the Sn–O–C composites from an electrochemical standpoint.
机译：通过三个连续步骤从有机碳酸盐溶剂通过有机碳酸盐溶剂进行电沉积，以合成SN-O-C复合材料，在50次循环后输送596mA H G _（Sn）〜（α1）的放电容量。然而，复合阳极遭受明显低的初始放电容量，输出放电容量为79 mA H _（Sn）〜（Δ1）直到第5周期。推出了通过电解质分解的锂化合物沉积，通过电解质分解在电沉积过程中伴随在电沉积过程中的还原产物，在表面层上，通过电解质分解形成的不可能的低初始能力。为了提高较差的初始容量，我们通过在沉积过程中实施电解质搅拌来修改表面层的化学成分。由于通过电解质本身的移动，因此在沉积过程中产生改变沉积过程中的扩散层厚度。结果，我们实现了初始放电容量的改善，在第1循环中输送572 mA H _（Sn）〜（α1），在第50周期处的586 ma H g _（Sn）〜（？1）。揭示了表面层由有机碳酸盐溶剂的分解产物组成。此外，通过电解质搅拌获得SN-O-C复合材料的较小粒径，从而在SN化合物核上产生均匀的壳体。在此，我们彻底地检查了在沉积过程中从电化学观点的Sn-O-C复合材料的性质期间的不同扩散层厚度的影响。

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