Ultrafine Nickel-Nanoparticle-Enabled SiO2 Hierarchical Hollow Spheres for High-Performance Lithium Storage
Ultrafine Nickel-Nanoparticle-Enabled SiO2 Hierarchical Hollow Spheres for High-Performance Lithium Storage
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用于高性能锂存储的超细镍纳米颗粒 SiO2 分级空心球
DOI：
10.1002/adfm.201704561
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发表时间：
2018-01-17
影响因子：
19
通讯作者：
Mai, Liqiang
中科院分区：
文献类型：
--
作者：
Tang, Chunjuan;Liu, Yuning;Mai, Liqiang
SiO2的高理论容量和天然丰度使其成为一种有前途的锂离子电池高容量负极材料。然而，其广泛的应用显着阻碍了固有的电子导电性差和剧烈的体积变化。在此，设计了一种独特的中空结构的Ni/SiO2纳米复合材料构建的超细Ni纳米粒子（约3 nm）功能化的SiO2纳米片。Ni纳米粒子不仅能有效地提高SiO2的电子电导率，而且能有效地提高SiO2的电化学活性。同时，中空腔体提供足够的自由空间以适应SiO2在重复锂化/脱锂化期间的体积变化;纳米片构建块减小锂离子的扩散长度。由于Ni和SiO2之间的协同效应，Ni/SiO2复合材料在0.1 A g（-1）下提供676 mA h g（-1）的高可逆容量。在10 A·g ~（-1）的高电流密度下，经1000次循环后，容量仍保持在337 mA·h·g ~（-1）。
The high theoretical capacity and natural abundance of SiO2 make it a promising high-capacity anode material for lithium-ion batteries. However, its widespread application is significantly hampered by the intrinsic poor electronic conductivity and drastic volume variation. Herein, a unique hollow structured Ni/SiO2 nanocomposite constructed by ultrafine Ni nanoparticle (approximate to 3 nm) functionalized SiO2 nanosheets is designed. The Ni nanoparticles boost not only the electronic conductivity but also the electrochemical activity of SiO2 effectively. Meanwhile, the hollow cavity provides sufficient free space to accommodate the volume change of SiO2 during repeated lithiation/delithiation; the nanosheet building blocks reduce the diffusion lengths of lithium ions. Due to the synergistic effect between Ni and SiO2, the Ni/SiO2 composite delivers a high reversible capacity of 676 mA h g(-1) at 0.1 A g(-1). At a high current density of 10 A g(-1), a capacity of 337 mA h g(-1) can be retained after 1000 cycles.