球磨时间对球磨-喷雾干燥法制备LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2的影响
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摘要
采用球磨-喷雾干燥-固相反应法合成了锂离子电池正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2,用X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)、交流阻抗(EIS)和恒流充放电研究了原料球磨时间对合成材料结构、形貌和电化学性能影响。实验结果表明,合成材料的结晶度、颗粒球形度、放电比容量均随球磨时间增加呈先增大后减小。球磨时间为6 h时合成材料的1 C放电比容量为171 mAh/g,循环50次容量保持率为91%,具有较好的电化学性能。
LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 was prepared by a milling-spray drying-solid state reaction process. The effects of milling time on the structure, morphology and the electrochemical performance of the prepared LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 were investigated by X-ray diffraction, SEM, CV, EIS analysis and charge-discharge test. The crystallinity, sphericity and discharge capacity of the obtained materials were first increased and then decreased with the increase of the milling time. The sample prepared with the milling time of 6 hours delivers a discharge specific capacity of 171 mAh/g at 1 C with a capacity retention of 91%, exhibiting good electrochemical performance.
LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 was prepared by a milling-spray drying-solid state reaction process. The effects of milling time on the structure, morphology and the electrochemical performance of the prepared LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 were investigated by X-ray diffraction, SEM, CV, EIS analysis and charge-discharge test. The crystallinity, sphericity and discharge capacity of the obtained materials were first increased and then decreased with the increase of the milling time. The sample prepared with the milling time of 6 hours delivers a discharge specific capacity of 171 mAh/g at 1 C with a capacity retention of 91%, exhibiting good electrochemical performance.
引文
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[4]XIAO Z L,ZHOU Q Q,SONG L B,et al.Assessment of thermoelectrochemical performance on cathode materials for lithium ion cells[J].International Journal of Electrochemical Science,2016,11:2825-2834.
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[7]陈九华,李建刚,王垒,等.锂电池正极材料LiNi0.8Co0.1Mn0.1O2的制备与性能[J].化工新型材料,2014(8):37-39.
[8]WU F,WANG M,SU Y F,et al.A novel method for synthesis of layered LiNi1/3Mn1/3Co1/3O2as cathode material for lithium-ion battery[J].Journal of Power Sources,2010,195(8):2362-2367.
[9]YUE P,WANG Z X,PENG W J,et al.Spray-drying synthesized LiNi0.6Co0.2Mn0.2O2and its electrochemical performance as cathode materials for lithium ion batteries[J].Powder Technology,2011,214(3):279-282.
[10]XIAO Z W,ZHANG Y J,WANG Y F.Synthesis of high-capacity LiNi0.8Co0.1Mn0.1O2cathode by transition metal acetates[J].Transactions of Nonferrous Metals Society of China,2015,25(5):1568-1574.
[11]孙学义,卢世刚,庄卫东,等.高温固相法合成LiNi0.25Co0.5Mn0.25O2及其结构性能研究[J].电源技术,2013,37(1):19-21,123.
[12]曹瑞军,林晨光.Cr3C2粉体的高能球磨细化[J].硬质合金,2010,27(4):206-208.
[13]闫春秋.锂离子电池富镍三元材料振实密度与一次颗粒研究[D].哈尔滨:哈尔滨工业大学,2015.
[14]熊利芝,胡清华,梁凯,等.锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2的制备与表征[J].功能材料,2010,41(4):610-615.
[15]郭永林.LiMn2O4形貌和尺寸的可控制备及其与电性能的关系研究[D].武汉:武汉理工大学,2012.
[16]ZHANG Z L,CHEN D H,CHANG H K.Improved electrochemical performance of LiNi0.8Co0.1Mn0.1O2cathode materials via incorporation of rubidium cations into the original Li sites[J].RSC Adv,2017(81):51721-51728.
[17]庄全超,徐守冬,邱祥云,等.锂离子电池的电化学阻抗谱分析[J].化学进展,2010,22(6):1044-1057.