Facile Fabrication of Porous Si Microspheres from Low‐Cost Precursors for High‐Capacity Electrode,Advanced Materials Interfaces

当前位置： X-MOL 学术 › Adv. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Facile Fabrication of Porous Si Microspheres from Low‐Cost Precursors for High‐Capacity Electrode
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-12-18 , DOI: 10.1002/admi.201901726
Liyuan Geng ₁ , Dandan Yang ₂ , Shilun Gao ₁ , Zhaoxiang Zhang ₁ , Feiyuan Sun ₁ , Yiyang Pan ₁ , Shaoqi Li ₁ , Xiaohua Li ₁ , Peng‐Fei Cao ₃ , Huabin Yang _{1,

4}

Affiliation

Comparing with nanometer‐sized Si (nano‐Si), the micrometer‐sized Si (micro‐Si) is more promising for the practical applications due to its low cost and scalable production method. Fabrication of micro‐Si with porous architecture can efficiently alleviate the high mechanical stress and severe mechanical fracture. Till now, it is still a challenge to achieve porous micro‐Si with controlled morphology, such as microsphere, from a cost‐efficient and environmentally friendly approach. Herein, a facile approach on fabricating Si microsphere with porous architecture via a low‐temperature aluminothermic reduction (LTAR) method using the low‐cost fumed silica (FS) as raw material is introduced. After compositing with graphite and then coating with amorphous carbon, the Si_FS/graphite@carbon (Si_FS/G@C) electrode displays superior reversible capacity (730 mAh g⁻¹ after 100 cycles) and excellent rate capability (729.1 mAh g⁻¹ at 1 A g⁻¹). The electrochemical performance is much better than that of Si‐microparticles/G@C (Mic‐Si/G@C, 368 mAh g⁻¹ at 100 mA g⁻¹ after 100 cycles). These results show the great potential of Si_FS/G@C electrode as an alternative high‐performance electrode material for lithium ion batteries. Moreover, the LTAR adopted in the current study significantly reduces the energy consumption for preparation of Si microspheres from low‐cost raw materials.

中文翻译：

低成本前体用于大容量电极的多孔硅微球的轻松制备

与纳米尺寸的Si（纳米Si）相比，微米尺寸的Si（micro-Si）由于其低成本和可扩展的生产方法而在实际应用中更具前景。具有多孔结构的微硅的制造可以有效地缓解高机械应力和严重的机械断裂。到目前为止，通过经济高效且环保的方法来获得具有可控形态的多孔微硅（例如微球）仍然是一个挑战。本文介绍了一种以低成本热解法二氧化硅为原料，通过低温铝热还原（LTAR）法制造具有多孔结构的硅微球的简便方法。与石墨复合，然后涂覆无定形碳后，Si _FS / graphite @ carbon（Si _FS/ G @ C）电极显示优良的可逆容量（730毫安克^-1 100次循环后）和优异的倍率性能（729.1毫安克^-1 1 A G ^-1）。电化学性能远优于Si-microparticles / G @ C（Mic-Si / G @ C，在100个循环后100 mA g ^-1下为368 mAh g ^-1）。这些结果表明，Si _FS / G @ C电极具有巨大的潜力，可替代锂离子电池的高性能电极材料。此外，当前研究中采用的LTAR大大降低了用低成本原材料制备Si微球的能耗。

更新日期：2019-12-18

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11