Freestanding three-dimensional core-shell nanoarrays for lithium-ion battery anodes.
Freestanding three-dimensional core-shell nanoarrays for lithium-ion battery anodes.
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用于锂离子电池阳极的独立式三维核壳纳米阵列
DOI：
10.1038/ncomms11774
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发表时间：
2016-06-03
影响因子：
16.6
通讯作者：
Amine K
中科院分区：
文献类型：
--
作者：
Tan G;Wu F;Yuan Y;Chen R;Zhao T;Yao Y;Qian J;Liu J;Ye Y;Shahbazian-Yassar R;Lu J;Amine K
过渡金属氧化物的结构退化和低导电性导致锂离子电池容量严重衰退。最近解决这一问题的努力主要集中在使用纳米复合材料或混合材料，通过将纳米尺寸的金属氧化物与导电添加剂集成在一起。在这里，我们设计了特定的分层结构，并演示了它们在灵活的大面积阳极组件中的应用。这些阳极的制造是通过在铜衬底上氧化生长氧化铜纳米线，然后射频溅射碳氮化膜，形成具有核壳纳米结构的独立三维阵列来实现的。电缆状的氧化铜/碳氮化核壳纳米结构适应了锂化-衰减过程中的体积变化，三维阵列提供了丰富的电活性区和电子/离子传输路径，而不需要额外的粘合剂或导电剂的单片三明治型结构提高了整个电极的能量/功率密度。在锂离子电池中，过渡金属氧化物阳极的降解和低导电性导致容量衰减。在这里，作者制作了独立的3D氧化铜/氮化碳核壳纳米阵列，可以适应体积变化，提供电活性区域并促进快速电荷传输。
Structural degradation and low conductivity of transition-metal oxides lead to severe capacity fading in lithium-ion batteries. Recent efforts to solve this issue have mainly focused on using nanocomposites or hybrids by integrating nanosized metal oxides with conducting additives. Here we design specific hierarchical structures and demonstrate their use in flexible, large-area anode assemblies. Fabrication of these anodes is achieved via oxidative growth of copper oxide nanowires onto copper substrates followed by radio-frequency sputtering of carbon-nitride films, forming freestanding three-dimensional arrays with core–shell nano-architecture. Cable-like copper oxide/carbon-nitride core–shell nanostructures accommodate the volume change during lithiation−delithiation processes, the three-dimensional arrays provide abundant electroactive zones and electron/ion transport paths, and the monolithic sandwich-type configuration without additional binders or conductive agents improves energy/power densities of the whole electrode. Degradation and low conductivity of transition metal oxide anodes cause capacity fading in lithium ion batteries. Here the authors make freestanding 3D copper oxide/carbon nitride core-shell nanoarrays which accommodate volume change, provide electro-active zones and facilitate rapid charge transport.