Smart Construction of Integrated CNTs/Li(4)Ti(5)O(12) Core/Shell Arrays with Superior High-Rate Performance for Application in Lithium-Ion Batteries.
Smart Construction of Integrated CNTs/Li(4)Ti(5)O(12) Core/Shell Arrays with Superior High-Rate Performance for Application in Lithium-Ion Batteries.
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DOI：
10.1002/advs.201700786
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Tu J
中科院分区：
文献类型：
--
作者：
Yao Z;Xia X;Zhou CA;Zhong Y;Wang Y;Deng S;Wang W;Wang X;Tu J
探索先进的高倍率负极对于下一代高功率锂离子电池（LIB）的发展具有重要意义。在这里，通过简单的组合化学气相沉积-原子层沉积（ALD）方法构建了碳布（CC）上的新型碳纳米管（CNT）/Li4Ti5O12（LTO）核/壳阵列作为集成的高质量阳极。 ALD 合成的 LTO 牢固地锚定在碳纳米管的骨架上，形成直径为 70-80 nm 的核/壳结构，在 CC-LTO@CNT 核/壳阵列中获得了高导电网络、大表面积和强粘附力等综合优势。 CC-CNTs/LTO电极作为锂离子电池负极的电化学性能得到了全面研究，显示出显着的高倍率性能（1 C下的容量为169 mAh g−1，20 C下的容量为112 mAh g−1），以及稳定的循环寿命，在10 C下循环5000次后容量保持率为86%，远远优于CC-LTO电极。同时，采用 LiFePO4 阴极和 CC-CNT/LTO 阳极的全电池也表现出优异的循环稳定性（在 10 C 下循环 1500 次后容量保持率为 87%）。这些积极的特征表明它们在高功率储能领域的应用前景广阔。
Exploring advanced high‐rate anodes is of great importance for the development of next‐generation high‐power lithium‐ion batteries (LIBs). Here, novel carbon nanotubes (CNTs)/Li4Ti5O12 (LTO) core/shell arrays on carbon cloth (CC) as integrated high‐quality anode are constructed via a facile combined chemical vapor deposition–atomic layer deposition (ALD) method. ALD‐synthesized LTO is strongly anchored on the CNTs' skeleton forming core/shell structures with diameters of 70–80 nm the combined advantages including highly conductive network, large surface area, and strong adhesion are obtained in the CC‐LTO@CNTs core/shell arrays. The electrochemical performance of the CC‐CNTs/LTO electrode is completely studied as the anode of LIBs and it shows noticeable high‐rate capability (a capacity of 169 mA h g−1 at 1 C and 112 mA h g−1 at 20 C), as well as a stable cycle life with a capacity retention of 86% after 5000 cycles at 10 C, which is much better than the CC‐LTO counterpart. Meanwhile, excellent cycling stability is also demonstrated for the full cell with LiFePO4 cathode and CC‐CNTs/LTO anode (87% capacity retention after 1500 cycles at 10 C). These positive features suggest their promising application in high‐power energy storage areas.
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