化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (12) : 152-155.

科学研究

三元掺杂尖晶石LiMn₂O₄正极材料的制备与电化学性能研究

作者信息 +

Preparation and electrochemical performance of ternary doped spinel LiMn₂O₄ anode material

Zhu Lvzhong, Chu Hairong, Chen Junqing, Pan Feng, Bei Fengli

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文章历史 +

Received		Published
2018-08-06		2019-12-20
Issue Date	Revised Date
2020-01-03	2018-08-06

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摘要

采用溶胶-凝胶法制备了三元掺杂改性的尖晶石型锰酸锂正极材料[LiAl_xCo_0.05Mg_0.05Mn_1.9-xO₄(x=0、0.02、0.05)]。通过X射线衍射(XRD)和扫描电镜(SEM)对材料进行了表征。结果表明:掺杂后的材料仍为尖晶石结构,无杂质相。SEM结果显示合成材料具有良好的粒径分布及形貌。通过充放电测试发现,掺杂过后的材料在高温下的电化学性能有很大程度的改善。其中,LiAl_0.02Co_0.05Mg_0.05Mn_1.88O₄具有最好的电化学性能,在55℃、0.2C倍率下首次放电比容量达到128.2mAh/g,循环40次后容量保持率仍能达到95.2%。

Abstract

The modified spinel [LiAl_xCo_0.05Mg_0.05Mn_1.9-x(x=0,0.02,0.05)] with three kinds of ions doped was synthesized by the sol-gel method.These prepared anode material were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM).XRD results demonstrated that the as-prepared manganic acid lithium anode materials possessed the spinel structure without any impurity phase.SEM showed that the materials had superior particle size distribution and mophology.Finally,charge-discharge testing indicated that the electrochemical properties of the materials were greatly improved under high temperature after doping modification.LiAl_0.02Co_0.05Mg_0.05Mn_1.88O₄ possessed the best electrochemical performance among all of the samples,where the initial specific capacity reached 128.2mAh/g under 55℃ at 0.2C,and the capacity retention rate can still reach to 95.2% after 40 cycles.

关键词

正极材料 / 溶胶-凝胶法 / 掺杂 / 电化学性能

Key words

anode material / sol-gel method / doping / electrochemical performance

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三元掺杂尖晶石LiMn₂O₄正极材料的制备与电化学性能研究[J]. 化工新型材料, 2019, 47(12): 152-155 DOI:

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参考文献

原文顺序 | 出版日期 | 本文引用

[1] Devaraju M K,Honma I.Hydrothermal and solvothermal process towards development of LiMPO₄ (M=Fe,Mn) nanomaterials for lithium-ion batteries[J].Advanced Energy Materials,2012,2(3):284-297.
[2] Yang X G,Leng Y,Zhang G,et al.Modeling of lithium plating induced aging of lithium-ion batteries:transition from linear to nonlinear aging[J].Journal of Power Sources,2017,360:28-40.
[3] 孙成越.模板法制备微纳结构的锰酸锂及电化学性能研究[D].杭州:浙江大学,2013.
[4] Jiang C H,Dou S X,Liu H K,et al.Synthesis of spinel LiMn₂O₄ nanoparticles through one-step hydrothermal reaction[J].Journal of Power Sources,2007,172(1):410-415.
[5] Liu M H,Huang H T,Lin C M,et al.Mg gradient-doped LiNi_0.5Mn_1.5O₄ as the cathode material for Li-ion batteries[J].Electrochimica Acta,2014,120:133-139.
[6] Kozawa T,Yanagisawa K,Murakami T,et al.Growth behavior of LiMn₂O₄ particles formed by solid-state reactions in air and water vapor[J].Journal of Solid State Chemistry,2016,243:241-246.
[7] Jin Y Z,Lv Y Z,Xue Y,et al.Improved electrochemical performance of LiNi_0.4Ti_0.1Mn_1.5O₄ as cathode of lithium ion battery by carbon-coating[J].RSC Advances,2014,4(100):57041-57047.
[8] Liu D,Liu X,He Z.Surface modification by ZnO coating for improving the elevated temperature performance of LiMn₂O₄[J].Journal of Alloys and Compounds,2007,436(1-2):387-391.
[9] Kim K J,Lee J H,Koh T Y,et al.Improved cyclic stability by octahedral Co³⁺ substitution in spinel lithium manganese oxide thin-film cathode for rechargeable microbattery[J].Electrochimica Acta,2016,200:84-89.
[10] Xiong L,Xu Y,Lei P,et al.The electrochemical performance of sodium-ion-modified spinel LiMn₂O₄ used for lithium-ion batteries[J].Journal of Solid State Electrochemistry,2014,18(3):713-719.
[11] Han C G,Zhu C,Saito G,et al.Improved electrochemical performance of LiMn₂O₄ surface-modified by a Mn⁴⁺-rich phase for rechargeable lithium-ion batteries[J].Electrochimica Acta,2016,209:225-234.
[12] Liu Jianhong,Sun Zhaoqin,Xie Jiaona,et al.Synthesis and electrochemical properties of LiNi_0.5-xCu_xMn_1.5-yAl_yO₄(x=0,0.05,y=0,0.05) as 5V spinel materials[J].Journal of Power Sources,2013,240:95-99.
[13] Xu W,Yuan A,Tian L,et al.Improved high-rate cyclability of sol-gel derived Cr-doped spinel LiCr_yMn_2-yO₄ in an aqueous electrolyte[J].Journal of Applied Electrochemistry,2011(41):453-455.