Long Cycle-life Organic Electrode Material based on an Ionic Naphthoquinone Derivative for Rechargeable Batteries☆
Long Cycle-life Organic Electrode Material based on an Ionic Naphthoquinone Derivative for Rechargeable Batteries☆
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DOI：
10.1016/j.egypro.2014.07.153
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Yao;Tatsuhiro Numoto;Mihoko Araki;H. Ando;H. Takeshita;T. Kiyobayashi
中科院分区：
文献类型：
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作者：
M. Yao;Tatsuhiro Numoto;Mihoko Araki;H. Ando;H. Takeshita;T. Kiyobayashi
研究了5,8-二羟基-1,4-萘醌(1)及其锂盐5,8-二羟基-1,4-萘醌二锂盐(2)的氧化还原反应作为可充电锂电池正极活性材料的适用性。所制备的电极的初始放电容量为170 mAh g(1)−1，平均电压为2.2 Vvs。 Li+/Li，247 mAh g(2)−1，平均电压为 2.1 Vvs。 Li+/Li分别为1和2。获得的放电容量与其双电子氧化还原行为相对应。虽然使用1的电极循环稳定性较差，但使用2的电极经历了多次循环；即，在第一个循环的容量小幅下降之后，后一个电极的容量在随后的100个循环中几乎没有衰减。讨论了离子基团的引入对循环稳定性等物理性能的影响以及量子化学计算结果。
The applicability of the redox reactions of 5,8-dihydroxy-1,4-naphthoquinone (1) and its lithium salt, 5,8-dihydroxy-1,4-naphthoquinone dilithium salt (2), as positive electrode active materials for rechargeable lithium batteries was investigated. The prepared electrodes showed initial discharge capacities of 170 mAh g(1)−1with an average voltage of 2.2 Vvs. Li+/Li, and 247 mAh g(2)−1with an average voltage of 2.1 Vvs. Li+/Li for1and2, respectively. The obtained discharge capacities correspond to their two-electron redox behaviors. While the electrode using1suffered from a poor cycle-stability, the one using2underwent many cycles;i.e., after a small drop in the capacity at the first cycle, the capacity of the latter electrode hardly decayed during the subsequent 100 cycles. The effects of the introduction of ionic groups on the physical properties including the cycle stability were discussed along with quantum chemistry calculation results.