Synthesis of 1,4-benzoquinone dimer as a high-capacity (501 mA h g−1) and high-energy-density (>1000 Wh kg−1) organic cathode for organic Li-Ion full batteries
Synthesis of 1,4-benzoquinone dimer as a high-capacity (501 mA h g−1) and high-energy-density (>1000 Wh kg−1) organic cathode for organic Li-Ion full batteries
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DOI：
10.1016/j.jpowsour.2019.227456
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发表时间：
2020-02
影响因子：
9.2
通讯作者：
Zeyi Yao;Wu Tang;Xinxin Wang;Chuan Wang;Chuluo Yang;Cong Fan
中科院分区：
文献类型：
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作者：
Zeyi Yao;Wu Tang;Xinxin Wang;Chuan Wang;Chuluo Yang;Cong Fan
具有高比容量的有机阴极是制造高比能密度有机锂离子电池的理想材料。在此，我们初步提出了系统合成1,4-苯醌（BQ）低聚物家族的长期计划，该家族的理论比容量可以达到500 mA h g−1以上。首先，合成了1,4-苯醌二聚体（2,2′-双-（1,4-苯醌），BBQ），该二聚体的比容量为501 mA h g−1，平均放电电位为~2.5 V （vs. Li+/Li）。即使面临溶解问题，BBQ在500 mA g−1下3000次循环的平均比容量为~190 mA h g−1，在2 A g−1的锂离子半电池中8000次循环的平均比容量为~120 mA h g−1。然后，以对苯二甲酸锂（Li2TP）的还原态（Li4TP）为起始阳极，BBQ为起始阴极，制备了全有机锂离子充满电池。令人高兴的是，Li4TP-BBQ锂离子电池在第一次循环中可以实现316 mA h g−1的阴极比容量（500 mA g−1）。同时，在1000次循环中，平均比容量可达到~98 mA h g−1（500 mA g−1）。Li4TP-BBQ锂离子电池的结果是迄今为止报道的最好的全有机锂离子电池之一。
The organic cathodes with high specific capacity are highly desirable to fabricate high-specific-energy-density organic Li-ion full cells. Herein, we initially propose the long-term plan for the systematic synthesis of the oligomer family of 1,4-benzoquinone (BQ), which can possess theoretical specific capacity above 500 mA h g−1. As a start, the dimer of 1,4-benzoquinone (2,2′-bis-(1,4-benzoquinone), BBQ) is synthesized, which can realize the specific capacity of 501 mA h g−1and the average discharge potential of ~2.5 V (vs. Li+/Li). Even facing the dissolution problem, BBQ can deliver average specific capacities of ~190 mA h g−1during 3000 cycles at 500 mA g−1and ~120 mA h g−1during 8000 cycles at 2 A g−1in Li-ion half cells. Afterwards, the all-organic Li-ion full cells are fabricated by using the reduced state (Li4TP) of lithium terephthalate (Li2TP) as the starting anode and BBQ as the starting cathode. Delightfully, the resulting Li4TP-BBQ Li-ion full cells can realize the specific capacity of 316 mA h g−1cathodein the 1st cycle (500 mA g−1). Meanwhile, average specific capacities of ~98 mA h g−1during 1000 cycles can be fulfilled (500 mA g−1). The results of the Li4TP-BBQ Li-ion full cells are among the best all-organic Li-ion full batteries reported to date.