材料科学
石墨烯
石墨
阳极
纳米技术
复合数
电解质
锂(药物)
阴极
化学工程
电化学
纳米颗粒
电极
复合材料
医学
工程类
内分泌学
物理化学
化学
作者
Ning Lin,Tianjun Xu,Tie‐Qiang Li,Ying Han,Yitai Qian
标识
DOI:10.1021/acsami.7b10639
摘要
Si-containing graphite-based composites are considered as promising high-capacity anodes for lithium-ion batteries (LIBs). Here, a controllable and scalable self-assembly strategy is developed to produce micro-nanostructured graphite/Si/reduced graphene oxides composite (SGG). The self-assembly procedure is realized by the hydrogen bond interaction between acylamino-modified graphite and graphene oxides (GO); Si nanoparticles are in situ embedded between graphite and GO sheets uniformly. This architecture is able to overcome the incompatibility between Si nanoparticles and microsized graphite. Accordingly, the as-prepared SGG anode (Si 8 wt %) delivers a reversible Li-storage capacity of 572 mAh g–1 at 0.2 C, 502.2 mAh g–1 after 600 cycles at 0.8 C with a retention of 92%, and a capacity retention of 64% even at 10 C. The impressive electrochemical properties are ascribed to the stable architecture and three-dimensional conductive network constructed by graphite and graphene sheets, which can accommodate the huge volume change of Si, keep the conductive contact and structural integrity, and suppress side reactions with electrolyte. Additionally, the full-cell (LiFePO4 cathode/SGG anode) delivers a specific capacity of 550 mAh g–1 with a working potential beyond 3.0 V.
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