对甲基苯磺酸钠掺杂聚吡咯/二氧化钛纳米管阵列全电池的电化学储锂性能
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摘要
采用电化学方法制备了对甲基苯磺酸钠掺杂的聚吡咯(TsONa/PPy)锂离子电池正极材料和二氧化钛纳米管阵列(TiO_2NT)负极材料。利用扫描电子显微镜和X射线能量色散光谱仪研究了样品的微观结构及形貌,并进一步组装成全电池,利用恒流充–放电和循环伏安(CV)技术测试了其电化学性能。结果表明:对甲基苯磺酸钠掺杂的聚吡咯正极材料是由直径为3μm左右的微球组成,二氧化钛负极材料则呈现三维有序纳米管阵列形貌,两种电极材料的表面皆凸凹不平;由二者组成的全电池首次放电比容量约为105 mA·h/g,经过50次循环后,可逆放电比容量仍保持在65 mA·h/g,表现了良好的循环稳定性,此外还表现了良好的倍率性能。
Sodium p-toluenesulfonate doped polypyrrole(TsONa/PPy) cathode material and titania nanotube(TiO_2NT) arrays anode material for lithium ion battery were synthesized by an electrochemical method.The microstructures and morphologies of the as-prepared sample were investigated by scanning electron microscopy and energy dispersive X-ray spectroscopy.The electrochemical performances of TsONa/PPy/TiO_2NT full cell were investigated by galvanostatic charge–discharge and cyclic voltammogram.The results show that TsONa/PPy cathode material consists of many microspheres with the diameter of about 3 μm,and TiO_2 anode material appears three-dimensional ordered nanotube arrays with the tough and uneven surfaces.TsONa/PPy/TiO_2NT full cell delivers an initial discharge specific capacity of 105 mA·h/g, and the corresponding reversible discharge specific capacity is 65 mA·h/g even after 50 cycles, indicating a good cycle stability.In addition, the full cell also exhibits a good rate performance.
Sodium p-toluenesulfonate doped polypyrrole(TsONa/PPy) cathode material and titania nanotube(TiO_2NT) arrays anode material for lithium ion battery were synthesized by an electrochemical method.The microstructures and morphologies of the as-prepared sample were investigated by scanning electron microscopy and energy dispersive X-ray spectroscopy.The electrochemical performances of TsONa/PPy/TiO_2NT full cell were investigated by galvanostatic charge–discharge and cyclic voltammogram.The results show that TsONa/PPy cathode material consists of many microspheres with the diameter of about 3 μm,and TiO_2 anode material appears three-dimensional ordered nanotube arrays with the tough and uneven surfaces.TsONa/PPy/TiO_2NT full cell delivers an initial discharge specific capacity of 105 mA·h/g, and the corresponding reversible discharge specific capacity is 65 mA·h/g even after 50 cycles, indicating a good cycle stability.In addition, the full cell also exhibits a good rate performance.
引文
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[4]ZHAO Y,LIU J,HU Y,et al.Highly compression-tolerant supercapacitor based on polypyrrole‐mediated graphene foam electrodes[J].Adv Mater,2013,25(4):591-595.
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[6]DENG X,WEI Z,CUI C,et al.Oxygen-deficient anatase TiO2@Cnanospindles with pseudocapacitive contribution for enhancing lithium storage[J].J Mater Chem A,2018,6:4013-4022.
[7]牛令辉,高明霞,刘永锋,等.纳米TiO2锂离子电池负极材料的溶剂热法制备及其电化学性能[J].材料科学与工程学报,2014,32(6):853-858.NIU Linghui,GAO Mingxia,LIU Yongfeng,et al.J Mater Sci Eng(in Chinese),2014,32(6):853-858.
[8]孟瑞晋,侯宏英,刘显茜,等.反应时间对二氧化钛纳米管阵列的形成及脱嵌Li+性能的影响[J].硅酸盐学报,2016,44(6):836-840.MENG Ruijin,HOU Hongying,LIU Xianxi,et al.J Chin Ceram Soc,2016,44(6):836-840.
[9]LIAO Q,HOU H,DUAN J,et al.Composite sodium p‐toluenesulfonate-polypyrrole-iron anode for a lithium-ion battery[J].J Appl Polymer Sci,2017,134:44935-44940.
[10]孟瑞晋,侯宏英,刘显茜,等.高度有序非晶TiO2纳米管阵列的制备及其锂电性能研究[J].硅酸盐通报,2016,35(1):30-33.MENG Ruijin,HOU Hongying,LIU Xianxi,et al.Bull Chin Ceram Soc(in Chinese),2016,35(1):30-33.
[11]SULTANA I,RAHMAN M M,WANG J,et al.All-polymer battery system based on polypyrrole(PPy)/para(toluene sulfonic acid)(pTS)and polypyrrole(PPy)/indigo carmine(IC)free standing films[J].Electrochim Acta,2012,83:209-215.
[12]ZHANG X,ARAVINDAN V,KUMAR P S,et al.Synthesis of TiO2 hollow nanofibers by co-axial electrospinning and its superior lithium storage capability in full-cell assembly with olivine phosphate[J].Nanoscale,2013,5(13):5973-5980.
[13]MENG R,HOU H,LIU X,et al.Reassessment of the roles of Ag in TiO2 nanotubes anode material for lithium ion battery[J].Ceram Int,2015,41(8):9988-9994.
[14]YANG Y,HE K,YAN P,et al.Enhanced capacity of polypyrrole/anthraquinone sulfonate/graphene composite as cathode in lithium batteries[J].Electrochim Acta,2014,138:481-485.
[15]唐致远,阮艳莉.锂离子电池容量衰减机理的研究进展[J].化学进展,20015,17(1):1-7.TANG Zhiyuan,RUAN Yanli.Prog Chem(in Chinese),20015,17(1):1-7.