Electrochemical Study of Poly(2,6-Anthraquinonyl Sulfide) as Cathode for Alkali-Metal-Ion Batteries
Electrochemical Study of Poly(2,6-Anthraquinonyl Sulfide) as Cathode for Alkali-Metal-Ion Batteries
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聚(2,6-蒽醌硫醚)作为碱-金属-离子电池正极的电化学研究
DOI：
10.1002/aenm.202002780
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发表时间：
2020-10-28
影响因子：
27.8
通讯作者：
Lu, Bingan
中科院分区：
文献类型：
--
作者：
Hu, Yanyao;Gao, Yang;Lu, Bingan
有机电极材料由于其可持续性和低成本而广泛应用于碱金属（锂、钠和钾）离子电池（LIB、SIB和PIB）。聚（2，6-蒽醌基硫醚）（PAQS）作为一种典型的有机正极材料，具有很高的理论容量，但其在碱金属离子电池中的电化学行为和机理仍需进一步研究。本文中，合成PAQS微球并将其用作LIB、SIB和PIB的阴极。当使用传统的低浓度电解液时，PAQS电极在LIB、SIB、PIB中的还原电压和首次放电容量分别为2.11 V/103 mAh g（-1）、1.76/1.30 V/134 mAh g（-1）、1.94/1.54 V/198 mAh g（-1），PAQS的循环稳定性顺序为LIBs > SIB> PIBs。为了进一步促进PIB的实际应用，提出了一种通过使用新型高浓度电解质来提高PIB的PAQS循环稳定性的方法。添加PAQS的PIB的循环稳定性可显著提高至1200次循环，每次循环的容量衰减为0.031%。这项工作可以为开发用于适用的金属离子电池的创新有机材料提供指导，证明了电解质优化对改善循环稳定性的影响。
Organic electrode materials are extensively applied for alkali metal (lithium, sodium, and potassium)-ion batteries (LIBs, SIBs, and PIBs) due to their sustainability and low cost. As a typical organic cathode, poly(2,6-anthraquinonyl sulfide) (PAQS) shows high theoretical capacity, yet its electrochemical behavior and mechanisms in alkali-metal-ion batteries still require clarification. Herein, PAQS microspheres are synthesized and applied as cathodes for LIBs, SIBs, and PIBs. When using traditional low-concentration electrolytes, the reduction voltage and the initial discharge capacity of PAQS electrode in LIB, SIBs, PIBs are 2.11 V/103 mAh g(-1), 1.76/1.30 V/134 mAh g(-1), 1.94/1.54 V/198 mAh g(-1) at 100 mA g(-1), respectively, while the cycling stability of PAQS is in the order of LIBs > SIBs > PIBs. To further promote the practical application of PIBs, a facile method is demonstrated to improve the cycle stability of PAQS for PIBs by using a novel high-concentration electrolyte. The cycling stability of PIBs with PAQS can be improved significantly to 1200 cycles with a capacity decay of 0.031% per cycle. This work may provide guidelines for developing innovative organic materials used in applicable metal-ion batteries demonstrates the impact of electrolyte optimization on improving the cycling stability.