聚1,5-蒽醌的制备及其在电极材料中的应用

Preparation of Poly(1,5-anthraquinone)and Its Application in Electrode Materials

通过原位聚合制备了一种聚1,5-蒽醌(P15AQ)包覆碳纳米管(CNT)复合材料(CNT@P15AQ),利用聚合解决蒽醌在电解液中易溶解稳定性差的问题,并借助碳纳米管构建电子传输通道,促进电极内部的电子转移,提升材料的倍率性能。探究了CNT含量对CNT@P15AQ复合材料电化学性能的影响。结果表明,相较于P15AQ,CNT@P15AQ复合材料的放电容量、倍率性能及循环稳定性均显著提升。当复合材料中w(CNT)=29%时,CNT@P15AQ复合电极在50 mA/g的电流密度下,首次放电比容量可达241.7 mA·h/g,10 C(1 C=260 mA/g)电流密度下充放电可保持约148.5 mA·h/g的放电比容量,且循环稳定性优异,1 C电流密度下经过100次循环,容量保持率可达84.7%。

Carbonyl compound has attracted great interest as the electrode material of polymer rechargeable battery owing to its potentially low-cost,sustainable,fast electrochemical reaction kinetics and multi-electron transfer capabilities.Among various carbonyl compounds,anthraquinone has been widely investigated in the past few years due to its excellent electrochemical stability and unique aromatic properties.Common anthraquinone materials often suffer from loss of capacity due to their low electronic conductivity and solubility in the organic electrolyte,which negatively affect the rate performance and cycling stability.Therefore,it is still challenging to develop anthraquinone based electrode with superior electrochemical performance.Many strategies have been attempted to address the above issues.Among them,the polymerization has been proved to be an effective strategy to reduce the solubility.Moreover,incorporating conductive additive with high specific surface area to form composites has also been demonstrated as an efficient approach to suppress dissociation dissolution and improve the electron transport in electrodes.Herein,a novel composite electrode material poly1,5-anthraquinone-coated carbon nanotube(CNT@P15AQ)was prepared via facile in-situ polymerization.After polymerization,the stability of anthraquinone in the organic electrolyte is significantly improved.In addition,the introduction of CNT can construct longrange electron transport pathways.Satisfactorily,the first discharge specific capacity of CNT@P15AQ composite electrode with 29%CNT mass fraction can reach 241.7 mA·h/g at a current density of 50 mA/g,which is 1.44 times higher than that of P15AQ.Meanwhile,the CNT@P15AQ composite electrode also exhibits excellent rate performance and cycle stability,which exhibits a reversible specific capacity of 148.5 mA·h/g at 10 C and retains 84.7%of its initial discharge capacity after 100 cycles at 1 C.High-performance CNT@P15AQ composite electrode with simple preparation method provides a broad application prospect of the next generation of rechargeable battery based on polymer electrode.