碳纳米管导电浆料的制备及其对LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2电化学性能的影响
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摘要
用CVD法制备碳纳米管,通过强酸超声处理后溶解在N-甲基吡咯烷酮(NMP)中制备成碳纳米管导电浆料,利用XRD,SEM,BET考察制备的碳纳米管导电剂浆料的结构和表面形貌,并考察其作为导电剂对LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2锂离子电池电化学性能的影响;结果表明经过王水处理后的碳纳米管获得了更好的分散性,并且得到了更多的介孔.添加了碳纳米管导电浆料的电池首次放电比容量是186.1 mAh/g,而未添加碳纳米管导电浆料的电池首次放电比容量是181.2 mAh/g.添加了碳纳米管导电浆料的电池循环性能更好,100次循环容量保持率是95.95%;添加了碳纳米管导电浆料的电池大倍率性能优越,在2 C、3 C、5 C倍率下要明显高于单独用SP做导电剂的电池(1 C=180 mA/g).并且,添加碳纳米管导电浆料的电池电极界面阻抗要小.
Carbon nanotubes(CNTs) were prepared by chemical vapor deposition(CVD). After strong acid sonication, the CNTs were dissolved in N-methyl-2-pyrrolidone(NMP) to prepare CNT conductive paste.Through X-ray diffraction(XRD), scanning electron microscopy(SEM) and Brunauer-Emmett-Teller(BET)surface area measurement, the structure and surface morphology of the obtained CNT conductive paste were investigated, as well as the effect of adding the CNTs as conductive agent on electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 lithium-ion batteries. The results showed that the CNTs had better dispersibility and more mesopores after treatment with aqua regia and that Li-ion batteries using CNTs as conductive agent had a higher first discharge capacity than that of conventional batteries, 186.1 mAh/g and 181.2 mAh/g, respectively.Besides, the results indicated that the capacity retention rate of the former was 95.95 % after 100 cycles,higher than that of the latter. Moreover, the former obviously showed better rate performance at 2 C, 3 C,and 5 C rates, compared with batteries only using SP as conductive agent.(1 C=180 mA/g) Moreover, the former had less electrode-electrolyte interface impedance.
Carbon nanotubes(CNTs) were prepared by chemical vapor deposition(CVD). After strong acid sonication, the CNTs were dissolved in N-methyl-2-pyrrolidone(NMP) to prepare CNT conductive paste.Through X-ray diffraction(XRD), scanning electron microscopy(SEM) and Brunauer-Emmett-Teller(BET)surface area measurement, the structure and surface morphology of the obtained CNT conductive paste were investigated, as well as the effect of adding the CNTs as conductive agent on electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 lithium-ion batteries. The results showed that the CNTs had better dispersibility and more mesopores after treatment with aqua regia and that Li-ion batteries using CNTs as conductive agent had a higher first discharge capacity than that of conventional batteries, 186.1 mAh/g and 181.2 mAh/g, respectively.Besides, the results indicated that the capacity retention rate of the former was 95.95 % after 100 cycles,higher than that of the latter. Moreover, the former obviously showed better rate performance at 2 C, 3 C,and 5 C rates, compared with batteries only using SP as conductive agent.(1 C=180 mA/g) Moreover, the former had less electrode-electrolyte interface impedance.
引文
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[2]杨东.碳纳米管在磷酸铁锂电池导电剂方面的应用研究[J].世界科学,2013(12):49-50.
[3]卢星河,郑立娟,崔旭轩.动力型锂离子电池的研究进展[J].化工新型材料,2010,38(3):41-43.
[4]IIJIMA S.Helical microtubules of graphitic carbon[J].nature,1991,354(6348):56-63.
[5]刘玲玲,张红梅.石墨烯在锂离子电池中的应用[J].当代化工研究,2018(6):65-66.
[6]WANG Z H,YUAN L X,SHAO Q G,et al.Mn3O4nanocrystals anchored on multi-walled carbon nanotubes as high-performance anode materials for lithium-ion batteries[J].Materials Letters,2012,80:110-113.
[7]EOM J Y,KWON H S,LIU J,et al.Lithium insertion into purified and etched multi-walled carbon nanotubes synthesized on supported catalysts by thermal CVD[J].Carbon,2004,42(12/13):2589-2596.
[8]LIU X Y,PENG H J,ZHANG Q,et al.Hierarchical carbon nanotube/carbon black scaffolds as short-and long-range electron pathways with superior Li-ion storage performance[J].ACS Sustainable Chemistry&Engineering,2013,2(2):200-206.
[9]WANG K,WU Y,LUO S,et al.Hybrid super-aligned carbon nanotube/carbon black conductive networks:A strategy to improve both electrical conductivity and capacity for lithium ion batteries[J].Journal of Power Sources,2013,233:209-215.
[10]杨中发,王庆杰,石斌,等.导电剂对锂离子电池正极性能的影响[J].电池,2015,45(1):34-36.
[11]LIN H B,HUANG W Z,RONG H B,et al.Surface natures of conductive carbon materials and their contributions to charge/discharge performance of cathodes for lithium ion batteries[J].Journal of Power Sources,2015,287:276-282.
[12]彭弯弯,徐唱,李之锋,等.面密度和压实密度对锂离子电池快充性能的影响[J].有色金属科学与工程,2017,8(3):69-73.
[13]夏雨,王双双,王义飞.碳纳米管在锂离子电池中的应用[J].储能科学与技术,2016,5(4):422-429.
[14]刘润,庄卫东,班丽卿,等.影响锂离子电池电极性能的一些因素[J].稀有金属,2016,40(10):1066-1075.
[15]闫坤,杨娟玉,于冰,等.导电剂形貌对硅碳负极电化学性能的影响[J].稀有金属,2016,40(10):1029-1037.
[16]郭进康,钟盛文,王强,等.分散剂对石墨烯正极浆料的影响[J].有色金属科学与工程,2016,7(6):73-76.
[17]段志伟,揭晓华,张艳梅.多壁碳纳米管的酸处理工艺研究[J].材料导报,2012,26(16):28-30.
[18]JIAO Z,WU Q,QIU J.Preparation and electrochemical performance of hollow activated carbon fiber-Carbon nanotubes three-dimensional self-supported electrode for supercapacitor[J].Materials&Design,2018,154:239-245.
[19]CHEN J,DING N W,LI Z F,et al.Organic cathode material for lithium ion battery[J].Progress in Chemistry,2015,27(9):1291-1301.