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Embedding Silicon in Pinecone‐Derived Porous Carbon as a High‐Performance Anode for Lithium‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-26 , DOI: 10.1002/celc.202000827 Changhaoyue Xu 1 , Boya Wang 1 , Hang Luo 1 , Peng Jing 1 , Xuemei Zhang 1 , Qian Wang 1 , Yun Zhang 1 , Hao Wu 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-26 , DOI: 10.1002/celc.202000827 Changhaoyue Xu 1 , Boya Wang 1 , Hang Luo 1 , Peng Jing 1 , Xuemei Zhang 1 , Qian Wang 1 , Yun Zhang 1 , Hao Wu 1
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Silicon with the advantages of ultra‐high theoretical specific capacity (4200 mAh g−1) and low potential is regarded as a promising anode material. However, its commercial application is still impeded by the poor rate capability and bad cycling durability caused by its low electrical/ionic conductivities and exaggerated volume change. Herein, an eco‐friendly pinecone‐derived porous carbon (PPC) is rationally prepared as a promising host material for Si/carbon composite anodes. Benefiting from the natural porous structure of pinecones, Si nanoparticles are successfully enclosed in the PPC substrate, forming the final PPC/Si composite. In this composite, the electroconductive PPC network combined with ultrafine Si nanoparticles enhances both rapid electron transfer and ion transport, and the porous structures not only ensure the effective infiltration of electrolyte but also accommodate the volume expansion of Si during cycling. As a result, the optimized PPC/Si composite exhibits remarkable rate performance (478.4 mAh g−1 at 2 A g−1) as well as prolonged cyclic stability (720.6 mAh g−1 at 0.2 A g−1 after 300 cycles). With a view to the eco‐friendly method and desirable lithium storage ability, our strategy may offer a new sight for the facile synthesis of Si‐based anode materials with great electrochemical performance.
中文翻译：
将硅嵌入派生于Pinecone的多孔碳中，作为锂离子电池的高性能阳极
硅具有极高的理论比容量（4200 mAh g -1），低电位被认为是很有前途的阳极材料。然而，由于其低的电/离子电导率和夸大的体积变化而导致的差的速率能力和差的循环耐久性，仍然阻碍了其商业应用。本文中，合理地制备了松果酮环保型多孔碳（PPC）作为有希望的Si /碳复合阳极主体材料。受益于松果的天然多孔结构，Si纳米颗粒成功地封装在PPC基板中，形成了最终的PPC / Si复合材料。在这种复合材料中，导电的PPC网络与超细的Si纳米颗粒相结合，既增强了电子的快速传输和离子传输，又具有多孔结构，不仅确保了电解质的有效渗透，而且还适应了循环过程中Si的体积膨胀。-1在2A克-1）以及延长的循环稳定性（720.6毫安克-1 0.2 A G -1 300次循环后）。考虑到环保的方法和理想的锂存储能力，我们的策略可能为容易合成具有良好电化学性能的硅基负极材料提供新的视野。
更新日期：2020-07-13
中文翻译：
将硅嵌入派生于Pinecone的多孔碳中，作为锂离子电池的高性能阳极
硅具有极高的理论比容量（4200 mAh g -1），低电位被认为是很有前途的阳极材料。然而，由于其低的电/离子电导率和夸大的体积变化而导致的差的速率能力和差的循环耐久性，仍然阻碍了其商业应用。本文中，合理地制备了松果酮环保型多孔碳（PPC）作为有希望的Si /碳复合阳极主体材料。受益于松果的天然多孔结构，Si纳米颗粒成功地封装在PPC基板中，形成了最终的PPC / Si复合材料。在这种复合材料中，导电的PPC网络与超细的Si纳米颗粒相结合，既增强了电子的快速传输和离子传输，又具有多孔结构，不仅确保了电解质的有效渗透，而且还适应了循环过程中Si的体积膨胀。-1在2A克-1）以及延长的循环稳定性（720.6毫安克-1 0.2 A G -1 300次循环后）。考虑到环保的方法和理想的锂存储能力，我们的策略可能为容易合成具有良好电化学性能的硅基负极材料提供新的视野。
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