Self‐Adaptive Electrode with SWCNT Bundles as Elastic Substrate for High‐Rate and Long‐Cycle‐Life Lithium/Sodium Ion Batteries,Small

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Self‐Adaptive Electrode with SWCNT Bundles as Elastic Substrate for High‐Rate and Long‐Cycle‐Life Lithium/Sodium Ion Batteries
Small ( IF 13.0 ) Pub Date : 2018-10-11 , DOI: 10.1002/smll.201802913
Yaxiong Wang ₁ , Jing Ren ₁ , Xiang Gao ₁ , Wenjun Zhang ₁ , Huiping Duan ₂ , Min Wang ₃ , Jianglan Shui ₂ , Ming Xu ₁

Affiliation

Massive volume change of active materials in lithium/sodium ion batteries (LIB/SIB) causes severe structural collapse of electrodes and fast capacity decay of batteries. Here, a coaxial composite of single‐wall carbon nanotube bundle (SWCNTB/SnO₂) nanoparticles (NPs)/N‐doped carbon shell (SWCNTB@SnO₂@C) is constructed, where SWCNTBs with exceptional elasticity are explored as a self‐adaptive substrate to supply a highly resilient conductive network. Within the confinement of hard carbon shells, SWCNTB can produce radially elastic deformation to accommodate the volume change of SnO₂ during Li⁺/Na⁺ insertion/extraction. This overcomes the problem of strain fracturing of the outer carbon shell, as well as maintains close electrical contact between SnO₂ and the conductive network. The LIB/SIB with the self‐adaptive SWCNTB@SnO₂@C electrode presents a series of superior battery performances, for example, a high specific capacity of 608 mAh g⁻¹ at 10 A g⁻¹ and 600 cycles in LIB without capacity decay.

中文翻译：

带有SWCNT束的自适应电极作为弹性基板，适用于长寿命和长寿命的锂/钠离子电池

锂/钠离子电池（LIB / SIB）中活性物质的大量体积变化会导致电极严重的结构崩溃和电池的快速容量衰减。在这里，构造了单壁碳纳米管束（SWCNTB / SnO ₂）纳米颗粒（NPs）/ N掺杂碳壳（SWCNTB @ SnO ₂ @C）的同轴复合材料，其中探索了具有出色弹性的SWCNTB作为自自适应基板，以提供高弹性的导电网络。在硬碳壳的限制内，SWCNTB可以产生径向弹性变形，以适应Li ⁺ / Na ⁺期间SnO ₂的体积变化插入/提取。这克服了外部碳壳的应变断裂的问题，并且保持了SnO ₂与导电网络之间的紧密电接触。具有自适应SWCNTB @ SnO ₂ @C电极的LIB / SIB具有一系列优异的电池性能，例如，在10 A g ^-1下具有608 mAh g ^-1的高比容量，在无容量的LIB中具有600次循环衰变。

更新日期：2018-10-11

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