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Carbon coated SiO nanoparticles embedded in hierarchical porous N-doped carbon nanosheets for enhanced lithium storage
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2021-07-27 , DOI: 10.1039/d1qi00778e
Qianliang Zhang 1, 2, 3, 4, 5 , Baojuan Xi 1, 2, 3, 4, 5 , Shenglin Xiong 1, 2, 3, 4, 5 , Yitai Qian 1, 2, 3, 4, 5
Affiliation  

SiO based materials have attracted attention as promising anodes for lithium-ion batteries (LIBs) with high energy density. However, severe volume variation and poor conductivity limit the development of SiO based materials. In this study, carbon coated SiO nanoparticles embedded in N-doped carbon nanosheets (SiO@C/CNSs) have been fabricated through simple ball milling followed by annealing treatment, which is facile and scalable. The g-C3N4 precursor plays a multifunctional role as a sacrificial template, nitrogen source for doping, and minor carbon source. The presence of N-doped porous carbon nanosheets could minimize the volume expansion, enhance the reaction kinetics and retain the integrity of the electrode. The SiO@C/CNS anode exhibits a stable reversible capacity of 690 mA h g−1 up to 400 cycles at 1 A g−1 and excellent rate capability. The SiO@C/CNS//LiFePO4 full cell further confirms its potential as a promising anode for high capacity LIBs.

中文翻译:

嵌入分级多孔 N 掺杂碳纳米片中的碳包覆 SiO 纳米颗粒用于增强锂存储

SiO 基材料作为具有高能量密度的锂离子电池(LIB)的有前途的负极而备受关注。然而,严重的体积变化和较差的导电性限制了 SiO 基材料的发展。在这项研究中,通过简单的球磨和退火处理制备了嵌入 N 掺杂的碳纳米片(SiO@C/CNSs)中的碳包覆的 SiO 纳米颗粒,该方法简便且可扩展。gC 3 N 4前驱体作为牺牲模板、用于掺杂的氮源和次要碳源发挥多功能作用。N掺杂的多孔碳纳米片的存在可以最大限度地减少体积膨胀,增强反应动力学并保持电极的完整性。SiO@C/CNS 负极表现出 690 mA hg 的稳定可逆容量-1到1 A G 400次循环-1和优异的倍率性能。SiO@C/CNS//LiFePO 4全电池进一步证实了其作为高容量LIBs负极的潜力。
更新日期:2021-08-12
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