富锂锰基材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2的改性与电化学性能研究
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摘要
为改善富锂材料的电化学性能,使用Li_3VO_4对富锂锰基材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2进行湿法包覆。对样品进行表征和电化学性能测试,结果表明,包覆工艺不会破坏富锂层状材料的结构;包覆物明显改善样品的电化学性能,其中3%包覆量的样品综合性能最好,首次放电比容量为243.2 m Ah/g,库伦效率70.9%;在1C下循环50次后,容量保持率为87.2%。
In order to improve electrochemical properties of Li-rich cathode materials,Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2 was wet-coated with Li_3VO_4 to obtain several samples with different coating amounts,which were then characterized and taken for testing electrochemical properties. Results showed that the coating process does not destroy the structure of the Li-rich layered material,and the coating material can obviously improve the electrochemical properties of the samples. It is shown that the sample with 3% coating presented the best comprehensive performance,with the first discharge capacity of 243. 2 m Ah/g and the coulombic efficiency of 70.9%. After 50 cycles at 1 C,the capacity retention rate was 87.2%.
In order to improve electrochemical properties of Li-rich cathode materials,Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2 was wet-coated with Li_3VO_4 to obtain several samples with different coating amounts,which were then characterized and taken for testing electrochemical properties. Results showed that the coating process does not destroy the structure of the Li-rich layered material,and the coating material can obviously improve the electrochemical properties of the samples. It is shown that the sample with 3% coating presented the best comprehensive performance,with the first discharge capacity of 243. 2 m Ah/g and the coulombic efficiency of 70.9%. After 50 cycles at 1 C,the capacity retention rate was 87.2%.
引文
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[3]高旭光.淬冷法合成锂离子电池正极材料Li Fe PO4的研究[D].长沙:中南大学冶金科学与工程学院,2009.
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[5]Jung Y S,Cavanagh A S,Yan Y F,et al.Effects of atomic layer deposition of Al2O3on the Li[Li0.20Mn0.54Ni0.13Co0.13]O2cathode for lithium-ion batteries[J].J Electrochem Soc,2011,158(12):A1298-1304.
[6]王丹.高容量富锂正极材料Li[Li(0.2)Ni(0.2)Mn(0.6)]O2的制备与改性研究[D].天津:天津大学理学院,2013.
[7]Pu X,Yu C.Enhanced overcharge performance of nano-LiCoO2by novel Li3VO4surface coatings[J].Nanoscale,2012(4):6743-6747.
[8]殷春梅,郭忻,周春仙,等.表面包覆对富锂锰基材料循环稳定性影响研究[J].矿冶工程,2016,36(3):94-97.
[9]吴保明,叶乃清,马真,等.x Li2Mn O3-(1-x)Li Ni(0.7)Co(0.3)O2的低温燃烧合成及电化学性能研究[J].无机化学学报,2013,29(9):1835-1841.
[10]张茜.毛细撞击流反应器合成富锂锰基正极材料Li[Li(0.2)-Ni(0.2)Mn(0.6)]O2的研究[D].北京:北京化工大学化学工程学院,2014.
[11]朱文均.多孔钛基氧化物锂离子电池负极材料制备及其电化学性能[D].杭州:浙江大学材料科学与工程学院,2016.
[12]Fu Q,Du F,Bian X F,et al.Electrochemical performance and thermal stability of Li1.18Co0.15Ni0.15Mn0.52O2surface coated with the ionic conductor Li3VO4[J].J Mater Chem A,2014(2):7555-7562.