0.5Li2MnO3·0.5Li(Ni1/3Co1/3Mn1/3)O2 (LLO)was synthesized through a coprecipitation method and preconditioned with mild acid steam.The pristine and acid-treated materials were characterized by X-ray diffraction(XRD),energy dispersive spectrometer (EDS),scanning electron microscopy (SEM),and battery tester to study the effects of acid steam treatment on the structure,morphology and electrochemical properties.The results showed that the mild acid treatment removed the surface Li2O,and formed a trace Ni and Co-doped spinel surface layer on the surface of Li-rich material.Therefore,the side reaction between anode and electrolyte could be inhibited,meanwhile the electrochemical properties of materials could be improved.The initial discharge capacity of LLO after acid steam treatment for 24h can reach 300mAh/g,the coulombic efficiency was 83%,and the capacity retention rate after about 200 cycles was about 78%.
Lv Xiaoxia, Hu Xiaoyu, Chen Jingyan, Yuan Ningyi, Ding Jianning, Liu Zhen
. Electrochemical performance enhancement of Li-rich Mn-based anode material through acid steam treatment[J]. New Chemical Materials, 2021
, 49(3)
: 192
-196
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.03.043
[1] Tang T,Zhang H L.Synthesis and electrochemical performance of lithium-rich cathode material Li[Li0.2Ni0.15Mn0.55Co0.1-xAlx]O2[J].Electrochimica Acta,2016,191:263-269.
[2] Zhou C X,Wang P B,Zheng J C,et al.Cyclic performance of Li-rich layered material Li1.1Ni0.35Mn0.65O2,synthesized through a two-step calcination method[J].Electrochimica Acta,2017,252:286-294.
[3] Zhang S,Gu H,Tang T,et al.Insight into the synergistic effect mechanism between the Li2MO3,phase and the LiMO2,phase(M=Ni,Co,and Mn) in Li- and Mn-rich layered oxide cathode materials[J].Electrochimica Acta,2018,266:66-67.
[4] Nayak P K,Erickson E M,Schipper F,et al.Review on challenges and recent advances in the electrochemical performance of high capacity Li- and Mn-rich cathode materials for Li-ion batteries[J].Advanced Energy Materials,2018,8(8):1702397.
[5] Cui S L,Wang Y,Liu S,et al.Evolution mechanism of phase transformation of Li-rich cathode materials in cycling[J].Electrochimica Acta,2019,328:135109.
[6] Li J,Xu C,Zhao J,et al.Li-rich nanoplates of Li1.2Ni0.13Co0.13Mn 0.54O2,layered oxide with exposed {010 planes as a high-performance cathode for lithium-ion batteries[J].Journal of Alloys and Compounds,2017,734:301-306.
[7] Wang D,Xu T,Li Y,et al.Integrated surface functionalization of Li-rich cathode materials for Li-ion batteries[J].ACS Applied Materials & Interfaces,2018,10(48):41802-41813.
[8] Saxena S,Hendricks C,Pecht M.Cycle life testing and modeling of graphite/LiCoO2 cells under different state of charge ranges[J].Journal of Power Sources,2016,327:394-400.
[9] Yang F,Zhang Q,Hu X,et al.Preparation of Li-rich layered-layered type,xLi2MnO3·(1-x)LiMnO2,nanorods and its electrochemical performance as cathode material for Li-ion battery[J].Journal of Power Sources,2017,353:323-332.
[10] Cho E,Seo S W,Min K.Theoretical prediction of surface stability and morphology of LiNiO2 cathode for Li ion battery[J].ACS Applied Materials & Interfaces,2017,9(38):33257-33266.
[11] Gu M,Belharouak I,Zheng J,et al.Formation of the spinel phase in the layered composite cathode used in Li-ion batteries[J].ACS Nano,2013,7(1):760-767.
[12] Yu H,Zhou H.High-energy cathode materials(Li2MnO3-LiMO2) for lithium-ion batteries[J].Journal of Physical Chemistry Letters,2013,4(8):1268-1280.
[13] Xu B,Fell C R,Chi M,et al.Identifying surface structural changes in layered Li-excess nickel manganese oxides in high voltage lithium ion batteries:a joint experimental and theoretical study[J].Energy & Environmental Science,2011,4(6):2223.
[14] Mohanty D,Sefat A S,Li J,et al.Correlating cation ordering and voltage fade in a lithium-manganese-rich lithium-ion battery cathode oxide:a joint magnetic susceptibility and TEM study[J].Physical Chemistry Chemical Physics,2013,15(44):19496-19509.[15] Wu F,Liu J,Li L,et al.Surface modification of Li-rich cathode materials for lithium-ion batteries with PEDOT:PSS conducting polymer[J].ACS Applied Materials & Interfaces,2016,8(35):23095-23104.
[16] Zheng F,Ou X,Pan Q,et al.Nanoscale gadolinium doped ceria (GDC) surface modification of Li-rich layered oxide as a high performance cathode material for lithium ion batteries[J].Chemical Engineering Journal,2017,394:497-507.
[17] Zhou H G,Yang Z H,Yin C J,et al.Fabrication of nanoplate Li-rich cathode material via surfactant-assisted hydrothermal method for lithium-ion batteries[J].Ceramics International,201844(16):20514-20523.
[18] Wang C,Lin J W,Yu Y H,et al.Electrochemical and structural investigation on ultrathin ALD ZnO and TiO2coated lithium-rich layered oxide cathodes[J].ACS Sustainable Chemistry & Engineering,2018,6(12):16941-16950.
[19] Kim J S,Johnson C S,Vaughey J T,et al.Pre-conditioned layered electrodes for lithium batteries[J].Journal of Power Sources,2006,153(2):258-264.
[20] Kim S M,Jin B S,Lee S M,et al.Effects of the Fluorine-substitution and acid treatment on the electrochemical performances of 0.3Li2MnO3·0.7LiMn0.60Ni0.25Co0.15O2cathode material for Li-ion battery[J].Electrochimica Acta,2015,171:35-41.
[21] Zhu Z,Yan H,Zhang D,et al.Preparation of 4.7 V cathode material LiNi0.5Mn1.5O4 by an oxalic acid-pretreated solid-state method for lithium-ion secondary battery[J].Journal of Power Sources,2013,224:13-19.