High energy Li-ion capacitors using two-dimensional TiSe0.6S1.4 as insertion host
High energy Li-ion capacitors using two-dimensional TiSe0.6S1.4 as insertion host
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DOI：
10.1039/c7ta04470d
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发表时间：
2017-09
影响因子：
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通讯作者：
A. Chaturvedi;Peng Hu;C. Kloc;Yun‐Sung Lee;V. Aravindan;S. Madhavi
中科院分区：
文献类型：
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作者：
A. Chaturvedi;Peng Hu;C. Kloc;Yun‐Sung Lee;V. Aravindan;S. Madhavi
发现使用Se取代的二维TiS 2（TiSe0.6S1.4）作为锂离子电容器（LIC）组件中的插入基质，以活性炭（AC）作为对电极，能量密度得到显著改善。利用化学气相传输法成功地合成了结晶度接近100%的高质量TiSe0.6S1.4，并将其用作LIC中的电池组件。在LIC制造之前，在具有金属Li的单电极配置中评估Li插入特性。单电极性能对于调节AC和TiSe 0.6S1.4的质量负载以实现最大能量密度至关重要。因此，基于AC/TiSe0.6S1.4的LIC可提供150 W h kg-1的能量密度，具有5000次循环的良好循环能力。对于TiSe0.6S1.4，观察到与电解质对应物的很少不期望的副反应，如阻抗测量所支持的。
A remarkable improvement in energy density was found using Se-substituted two-dimensional TiS2 (TiSe0.6S1.4) as the insertion matrix in a Li-ion capacitor (LIC) assembly with activated carbon (AC) as the counter electrode. Chemical vapor transport was successfully used to synthesize high quality TiSe0.6S1.4 with near-100% crystallinity and subsequently employed as a battery component in LICs. Prior to LIC fabrication, the Li-insertion properties were assessed in single-electrode configuration with metallic Li. Single-electrode performance is crucial for adjusting the mass loading of AC and TiSe0.6S1.4 to realize the maximum energy density. Accordingly, an AC/TiSe0.6S1.4-based LIC delivered an energy density of ∼50 W h kg−1 with a good cyclability of 5000 cycles. Few undesirable side reactions with the electrolyte counterpart were observed for TiSe0.6S1.4, as supported by the impedance measurements.