TiS(2) as an Advanced Conversion Electrode for Sodium-Ion Batteries with Ultra-High Capacity and Long-Cycle Life.

TiS(2) as an Advanced Conversion Electrode for Sodium-Ion Batteries with Ultra-High Capacity and Long-Cycle Life.
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TiS2 作为超高容量和长循环寿命钠离子电池的高级转换电极

DOI:
10.1002/advs.201801021
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发表时间:
2018-11
期刊:
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
影响因子:
--
通讯作者:
Jiang K
Jiang K
中科院分区:
其他
文献类型:
--
作者:
Tao H;Zhou M;Wang R;Wang K;Cheng S;Jiang K

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研究二硫化钛(TiS2)作为醚基电解质(NaPF6/甘醇二甲醚(DME))中钠(Na)离子电池(NIB)的先进转换电极。所制备的 TiS2 在 0.2 A g−1 下表现出 1040 mA h g−1 的高可逆容量,在低于 1.0 V(相对于 Na/Na+)的电压区域中的容量贡献为 521 mA h g−1,显着的初始库仑效率为 95.9%,在 40 A g−1 下具有 621 mA h g−1 的优异倍率能力。化学转化反应产生的钛基化合物和纳米颗粒的高电导率可以最大限度地减少可逆转化的熵势垒,从而使电极具有高可逆性和超快充放电能力。此外,凭借其强大的吸附可溶性多硫化物中间体的能力,所制备的TiS2电极在9000次循环后表现出优异的循环稳定性,可作为NIBs稳定的超高容量转换电极。
Titanium disulfide (TiS2) is investigated as an advanced conversion electrode for sodium (Na)‐ion batteries (NIB) in an ether‐based electrolyte (NaPF6/glyme (DME)). The as‐prepared TiS2 demonstrates a high reversible capacity of 1040 mA h g−1 at 0.2 A g−1 with the capacity contribution of 521 mA h g−1 in the voltage region below 1.0 V (vs Na/Na+), remarkable initial coulombic efficiency of 95.9% and superior rate capability of 621 mA h g−1 at 40 A g−1. The high conductivity of the Ti‐based compounds and nanosized particles generated by chemical conversion reactions could minimize the entropic barrier for the reversible conversion, resulting in high reversibility and ultrafast charge/discharge ability of the electrode. Moreover, with its strong ability to adsorb soluble polysulfide intermediates, the as‐prepared TiS2 electrode exhibits superior cycling stability over 9000 cycles, serving as a stable and ultra‐high capacity conversion electrode for NIBs.
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