固体含量对共沉淀法制备三元材料的影响
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摘要
采用氢氧化钠共沉淀法制备Ni_(0.5)Co_(0.3)Mn_(0.2)(OH)_2前驱体,研究了固体含量对材料形貌、晶格结构以及电化学性能的影响。通过X射线衍射(XRD)、扫描电镜(SEM)和电化学测试对合成样品进行表征。结果表明,在固体含量为5%时,前驱体的形貌较为规准,颗粒较为致密,正极材料具有良好的电化学性能。采用酸化处理石墨烯,按1∶1的质量比与乙炔黑复合作为导电剂,结果表明添加石墨烯后,三元正极材料LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2首次放电比容量高达203.86 mAh/g,交流阻抗降低,具有更好的电化学性能。
The precursor of Ni_(0.5)Co_(0.3)Mn_(0.2)(OH)_2 was prepared with the hydroxide co-precipitation method. The effects of solid content on the morphology, crystal structure and electrochemical properties of the materials were studied.The synthesized samples were analyzed by X-ray diffraction(XRD), scanning electron microscope(SEM) and electrochemical performance. The results show that the morphology of precursor is normalized, the particles are dense, and the synthesized cathode material has good electrochemical performance under the solid content at 5%.The acidification of graphene was composited with acetylene black according to the ratio of 1∶1. The results show that the first discharge capacity of LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2-graphene is up to 203.86 mAh/g, and the impedance of Rct and RSEI are reduced, and has better electrochemical performance.
The precursor of Ni_(0.5)Co_(0.3)Mn_(0.2)(OH)_2 was prepared with the hydroxide co-precipitation method. The effects of solid content on the morphology, crystal structure and electrochemical properties of the materials were studied.The synthesized samples were analyzed by X-ray diffraction(XRD), scanning electron microscope(SEM) and electrochemical performance. The results show that the morphology of precursor is normalized, the particles are dense, and the synthesized cathode material has good electrochemical performance under the solid content at 5%.The acidification of graphene was composited with acetylene black according to the ratio of 1∶1. The results show that the first discharge capacity of LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2-graphene is up to 203.86 mAh/g, and the impedance of Rct and RSEI are reduced, and has better electrochemical performance.
引文
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[16]SAVUT J S,NURGUL S,SHI X Q,et al.Improvement of electrochemical performance of Li Ni0.8Co0.1Mn0.1O2cathode material by graphene nanosheets modification[J].Electrochim Acta,2014,149:86-93.
[2]王接喜,李新海,王志兴,等.快速共沉淀过程p H值对Ni0.8Co0.1-Mn0.1(OH)2及Li Ni0.8Co0.1Mn0.1O2性能的影响[J].中国有色金属学报,2011,21(9):2176-2181.
[3]陈巍,李新海,王志兴,等.共沉淀法制备Ni0.8Co0.1Mn0.1(OH)2过程中加料速度对其性能的影响[J].中国有色金属学报,2012,22(7):1957-1986.
[4]陆雷,钟伟攀,杨晖,等.高致密球形Li Ni0.8Co0.1Mn0.1O2颗粒的合成及性能研究[J].无机材料学报,2012,27(3):259-264.
[5]代克化,王银杰,冯华君,等.氢氧化物共沉淀法制备Li Mn0.45-Ni0.45Co0.1O2正极材料的反应条件[J].物理化学学报,2007,23(12):1927-1931.
[6]WANG G,SHEN X,YAO J,et al.Graphene nanosheets for enhanced lithium storage in lithium ion batteries[J].Carbon,2009,47(8):2049-2053.
[7]ZHU Y,MURALI S,CAI W,et al.Graphene and graphene oxide:synthesis,properties,and applications[J].Advanced materials,2010,22(35):3906-3924.
[8]何晓蕾,余燕芳,陈秋玉等.石墨烯基复合材料的研究进展[J].材料导报,2013,27(3):22-28.
[9]VENKATESWARA R C,LEELA M R A,ISHIKAWA Y,et al.LiCo1/3Ni1/3Mn1/3O2-graphene composite as a promising cathode for lithium-ion batteries[J].ACS Applied Materials&Interfaces,2011,3(8):2966-2972.
[10]HE J,CHEN Y,LI P,et al.Synthesis and electrochemical properties of graphene-modified Li Co1/3Ni1/3Mn1/3O2cathodes for lithium ion batteries[J].RSC Adv,2014,4(5):2568-2572.
[11]FANG X,GE M,RONG J,et al.Graphene-oxide-coated Li Ni0.5-Mn1.5O4as high voltage cathode for lithium ion batteries with high energy density and long cycle life[J].Journal of Materials Chemistry A,2013,1(12):4083-4088.
[12]JAN S S,NURGUL S,SHI X,et al.Improvement of electrochemical performance of Li Ni0.8Co0.1Mn0.1O2cathode material by graphene nanosheets modification[J].Electrochimica Acta,2014,149:86-93.
[13]DENG C,LIU L,ZHOU W,et al.Effect of synthesis condition on the structure and electrochemical properties of Li Ni1/3Co1/3Mn1/3O2prepared by hydroxide co-precipitation method[J].Electrochimica Acta,2008,53(5):2441-2447.
[14]KAGEYAMA M,LI D,KOBAYAKAWA K,et al.Structural and electrochemical properties of Li Ni1/3Mn1/3Co1/3O2-xFxprepared by solid state reaction[J].Journal of Power Sources,2006,157(1):494-500.
[15]CHANG Z R,CHEN Z J,WU F,et al.Synthesis and characterization of high-density non-spherical Li Ni1/3Co1/3Mn1/3O2cathode material for lithium ion batteries by two-step drying method[J].Electrochimica Acta,2008,53(20):5927-5933.
[16]SAVUT J S,NURGUL S,SHI X Q,et al.Improvement of electrochemical performance of Li Ni0.8Co0.1Mn0.1O2cathode material by graphene nanosheets modification[J].Electrochim Acta,2014,149:86-93.