Particle surface of LiMn2O4 cathode material for lithium ion battery was modified by a pyrolysis of silane coupling agent.The morphology,structure and comprehensive electrochemical properties of the materials were characterized systematically.The results shown that the SiO2 obtained from silane coupling agent was coated on the surface of the material.The coating did not affect the crystal structure and morphology,but the electrochemical properties of LiMn2O4 were improved significantly.The optimum comprehensive performance of the cathode can be obtained at SiO2 coating amount of 1wt%.The initial discharge specific capacity and capacity retention (after 100 charge-discharge cycles) of LiMn2O4 can be increased from 93.88mAh/g and 88.03% to 112.05mAh/g and 94.54% respectively after coating.The reason for this was that the coating layer can inhibit the side reactions between electrolyte and electrode material,which reduced SEI film impedance(Rf),stabilized the structure of the materials and resulted in the improvement the diffusion ability of Li+ during the insertion/deinsertion process.
Wang Sunfa, Feng Yanyan, Zhang Xiaopeng, Feng Lanlan, Yuan Zhenluo, Fan Guangxin, Liu Baozhong
. Surface treatment on structure and property of LiMn2O4 by silane coupling agent[J]. New Chemical Materials, 2020
, 48(12)
: 124
-128
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.030
[1] Cho I H,Kim S S,Shin S C,et al.Effect of SEI on capacity losses of spinel lithium manganese oxide/graphite batteries stored at 60C[J].Electrochemical and Solid-State Letters,2010,13(11):A168-A172.
[2] Guler A,Duman S O,Nalci D,et al.Graphene assisted template based LiMn2O4 flexible cathode electrodes[J].International Journal of Energy Research,2018,42(9):2971-2982.
[3] Waller G H,Brooke P D,Rainwater B H,et al.Structure and surface chemistry of Al2O3 coated LiMn2O4 nanostructured electrodes with improved lifetime[J].Journal of Power Sources,2016,306:162-170.
[4] Zuo D,Tian G,Li X,et al.Recent progress in surface coating of cathode materials for lithium ion secondary batteries[J].Journal of Alloys and Compounds,2017,706:24-40.
[5] Cao Z,Li Y,Shi M,et al.Improvement of the cycling performance and thermal stability of lithium-ion batteries by coating cathode materials with Al2O3 nano layer[J].Journal of the Electrochemical Society,2017,164(2):A475-A481.
[6] Liu H,Cheng C,Zhang K.The effect of ZnO coating on LiMn2O4 cycle life in high temperature for lithium secondary batteries[J].Materials Chemistry and Physics,2007,101(2-3):276-279.
[7] Kim C S,Kim K,Yic C W.Characteristics and electrochemical performance of the LiMn2O4 with TiO2 surface layer in lithium secondary batteries[J].Journal of Ceramic Processing Research,2015,16(2):232-236.
[8] Lim S,Cho J.PVP-functionalized nanometre scale metal oxide coatings for cathode materials:successful application to LiMn2O4 spinel nanoparticles[J].Chemical Communications,2008(37):4472-4474.
[9] Liang L,Hu G,Jiang F,et al.Electrochemical behaviours of SiO2-coated LiNi0.8Co0.1Mn0.1O2 cathode materials by a novel modification method[J].Journal of Alloys and Compounds,2016,657:570-581.
[10] Li Y D,Zhao S X,Nan C W,et al.Electrochemical performance of SiO2-coated LiFePO4 cathode materials for lithium ion battery[J].Journal of Alloys and Compounds,2011,509(3):957-960.
[11] Guo J,Chen Y,Xu C,et al.Enhanced electrochemical performance of LiMn2O4 by SiO2 modifying via electrostatic attraction forces method[J].Ionics,2019,25(7):2977-2985.
[12] Arumugam D,Kalaignan G P.Synthesis and electrochemical characterizations of Nano-SiO2-coated LiMn2O4 cathode materials for rechargeable lithium batteries[J].Journal of Electroanalytical Chemistry,2008,624(1-2):197-204.
[13] Mallakpour S,Madani M.A review of current coupling agents for modification of metal oxide nanoparticles[J].Progress in Organic Coatings,2015,86:194-207.
[14] 范广新,刘泽萍,闻寅,等.硅烷偶联剂表面处理对LiNi0.8Co0.15Al0.05O2结构和性能的影响[J].无机材料学报,2018,33(7):749-755.
[15] Xia Y,Yoshio M.An investigation of lithium ion insertion into spinel structure Li-Mn-O compounds[J].Journal of the Electrochemical Society,1996,143(3):825-833.
[16] Zhuo H,Wan S,He C,et al.Improved electrochemical performance of spinel LiMn2O4 in situ coated with graphene-like membrane[J].Journal of Power Sources,2014,247:721-728.
[17] Ming H,Yan Y,Ming J,et al.Gradient V2O5 surface-coated LiMn2O4 cathode towards enhanced performance in Li-ion battery applications[J].Electrochimica Acta,2014,120:390-397.
[18] Zhou W J,He B L,Li H L.Synthesis,structure and electrochemistry of Ag-modified LiMn2O4 cathode materials for lithium-ion batteries[J].Materials Research Bulletin,2008,43(8-9):2285-2294.
[19] Tron A,Park Y D,Mun J.AlF3-coated LiMn2O4 as cathode material for aqueous rechargeable lithium battery with improved cycling stability[J].Journal of Power Sources,2016,325:360-364.
[20] Zhang Z,Chen Z,Wang G,et al.Dual-doping to suppress cracking in spinel LiMn2O4:a joint theoretical and experimental study[J].Physical Chemistry Chemical Physics,2016,18(9):6893-6900.