材料科学
阳极
纳米片
纳米颗粒
化学工程
锂(药物)
纳米复合材料
电化学
扩散
复合数
离子
镍
锂离子电池
电导率
纳米技术
电池(电)
复合材料
冶金
电极
有机化学
内分泌学
工程类
物理化学
物理
功率(物理)
化学
热力学
医学
量子力学
作者
Chunjuan Tang,Yuning Liu,Chang Xu,Jiexin Zhu,Xiujuan Wei,Liang Zhou,Liang He,Wei Yang,Liqiang Mai
标识
DOI:10.1002/adfm.201704561
摘要
Abstract The high theoretical capacity and natural abundance of SiO 2 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/SiO 2 nanocomposite constructed by ultrafine Ni nanoparticle (≈3 nm) functionalized SiO 2 nanosheets is designed. The Ni nanoparticles boost not only the electronic conductivity but also the electrochemical activity of SiO 2 effectively. Meanwhile, the hollow cavity provides sufficient free space to accommodate the volume change of SiO 2 during repeated lithiation/delithiation; the nanosheet building blocks reduce the diffusion lengths of lithium ions. Due to the synergistic effect between Ni and SiO 2 , the Ni/SiO 2 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI