Three-dimensional carbon-coated Si/rGO nanostructures anchored by nickel foam with carbon nanotubes for Li-ion battery applications
Three-dimensional carbon-coated Si/rGO nanostructures anchored by nickel foam with carbon nanotubes for Li-ion battery applications
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DOI：
10.1016/j.nanoen.2015.05.020
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发表时间：
2015-07
期刊：
影响因子：
17.6
通讯作者：
Jingbo Chang;Xingkang Huang;Guihua Zhou;S. Cui;Shun Mao;Junhong Chen
中科院分区：
文献类型：
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作者：
Jingbo Chang;Xingkang Huang;Guihua Zhou;S. Cui;Shun Mao;Junhong Chen
纳米结构硅（Si）电极作为锂离子电池（LIB）负极显示出巨大的潜力，因为它的电荷存储容量是传统石墨的十倍；然而，由于硅基负极的循环性能差和本征电导率低，其实际应用受到严重阻碍。在这里，我们开发了一种新型无粘合剂硅基阳极，通过用碳布和还原氧化石墨烯（rGO）封装硅纳米颗粒（Si NP），其中源自泡沫镍的碳纳米管（CNT）在活性材料和集流体之间形成牢固的机械和电气连接。在由此产生的结构中，由硅表面上的聚甲基丙烯酸甲酯（PMMA）碳化形成的致密蜂窝碳布可以提高导电性并适应体积变化，而rGO网络则提供额外的机械强度以保持电极的完整性。新设计的纳米结构在 0.05 C (130 mA g−1) 下表现出高达 2700 mAh g−1 的高可逆容量，并且在 2.6 A g−1 循环 900 次后仍具有 70% 的容量保留率 (高达 1311 mAh g−1)。
A nanostructured silicon (Si) electrode has shown great potential as a lithium-ion battery (LIB) anode because it has a charge storage capacity ten times more than that of conventional graphite; however, practical applications of Si-based anodes have been severely hindered due to their poor cyclability and low intrinsic electrical conductivity. Here we develop a novel binder-free Si-based anode through the encapsulation of Si nanoparticles (Si NPs) with carbon cloth and reduced graphene oxide (rGO), where carbon nanotubes (CNTs) rooted from a nickel foam result in a strong connection mechanically and electrically between active materials and current collectors. In the resulting architecture, a dense cellular carbon cloth from carbonization of poly(methyl methacrylate) (PMMA) on Si surfaces can improve the electrical conductivity and accommodate the volume change, whereas rGO networks provide additional mechanical strength to maintain the integrity of electrodes. The newly designed nanostructure exhibited a high reversible capacity up to 2700 mAh g−1at 0.05 C (130 mA g−1) and 70% of capacity retention (up to 1311 mAh g−1) at 2.6 A g−1after 900 cycles.