化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (8) : 224-227.

开发与应用

La_0.65Sr_0.35MnO₃@LiMn₂O₄正极材料在聚合物锂电池中的应用

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Application of La_0.65Sr_0.35MnO₃@LiMn₂O₄ anode material in lithium polymer battery

Li Qingyu¹, Huang Dequan¹, Lai Feiyan¹, Xiong Qing¹, Wang Hongqiang¹, Liu Guozhuang²

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文章历史 +

Received
2018-03-14
Issue Date	Revised Date
2019-09-04	2018-03-14

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摘要

通过以乙酸镧、乙酸锶和乙酸锰制备的锰酸锶镧(La_0.65Sr_0.35MnO₃)和尖晶石型锰酸锂(LiMn₂O₄)正极材料作为原料,采用溶胶-凝胶法制备了质量分数分别为0.5%、1.0%和2.0%的锰酸锶镧表面包覆的LiMn₂O₄正极材料。采用X-射线衍射(XRD)、扫描电镜(SEM)、充放电循环测试等对包覆材料的结构、形貌和电化学性能进行表征,研究不同包覆比例对材料的微观结构、形貌及在502030型电池中电的化学性能。通过XRD和SEM分析可知,包覆锰酸锶镧对锰酸锂的结构并没有改变,当包覆比例为1.0%时,包覆材料分布均匀。对材料进行电化学性能测试发现,纯相LiMn₂O₄首次放电比容量为94.5mAh/g,循环500周后容量保持率为57.78%;包覆比例为1.0%的LiMn₂O₄首次放电比容量为106.2mAh/g,循环500周后容量保持率为64.22%,首次放电比容量增加了12.4%,容量保持率提高了6.44%。结果表明,经过包覆后材料的电化学性能得到了明显提高。

Abstract

Based lanthanum acetate,strontium acetate and acetic acid,prepared strontium and manganese acetate manganese strontium lanthanum and spinel lithium manganese acid (LiMn₂O₄) anode materials as the raw materials,lanthanum strontium manganate surface coated LiMn₂O₄ anode materials were synthesized through the sol-gel method,which coating quality were 0,0.5%,1.0% and 0.5%,respectively.Using X-ray diffraction (XRD),scanning electron microscopy (SEM) and charge-discharge cycle test,the composition,structure,morphology and electrochemical properties of the target material were characterized.The effects of different coating ratios on the structure,morphology and electrochemical properties of the composites were investigated.By XRD and SEM analysis,it can be seen that the structure of the coated lithium manganate had not changed,and when the coating ratio was 1%,the coating material was evenly distributed.The initial discharge capacity of pure LiMn₂O₄ was 94.5mAh/g,and the capacity retention rate was 57.78% after 500 cycles.The first discharge capacity of LiMn₂O₄ with a coating ratio of 1% was 106.2mAh/g.After 500 cycles,the retention rate was 64.22%,the initial discharge capacity increased by 12.4%,and the capacity retention rate increased by 6.44%.The results showed that the material electrochemical properties were obviously improved after the coating.

关键词

LiMn₂O₄ / La_0.65Sr_0.35MnO₃涂层 / 溶胶-凝胶法 / 软包装锂离子电池 / 电化学性能

Key words

LiMn₂O₄ / La_0.65Sr_0.35MnO₃ coating / sol-gel method / soft lithium ion battery / electrochemical performance

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La_0.65Sr_0.35MnO₃@LiMn₂O₄正极材料在聚合物锂电池中的应用[J]. 化工新型材料, 2019, 47(8): 224-227 DOI:

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参考文献

原文顺序 | 出版日期 | 本文引用

[1] Ali Eftekhari.Lithium-Ion batteries with high rate capabilities[J].ACS Sustainable Chem Eng,2017,5:2799-2816.
[2] Marcus Fehse,Rafael Trócoli,Edgar Ventosa.Ultrafast dischargeable LiMn₂O₄ thin-film electrodes with pseudocapacitive properties for microbatteries[J].ACS Appl Mater Interfaces,2017,9:5295-5301.
[3] Wang F,Wang J Y,Ren H.Multi-shelled LiMn₂O₄ hollow microspheres as superior cathode materials for lithium-ion batteries[J].Inorg Chem Front,2016,3:365-369.
[4] Xiong L,Xu Y,Tao T,et al.Synthesis and electrochemical characterization of multi-cations doped spinel LiMn₂O₄ used for lithium ion batteries[J].Journal of Power Sources,2012,199:214-219.
[5] Kim Y,Lim J,Kang S,Investigation on the dissolution of Mn ions from LiMn₂O₄ cathodein the application of lithium ion batteries:first principle molecular orbital method[J].International Journal of Quantum Chemistry,2013,113:148-154.
[6] Hirayama M,Ido H,Kim K,et al.Dynamic structural changes at LiMn₂O₄/electrolyte interface during lithium battery reaction[J].Journal of the American Chemical Society,2010,132:15268-15276.
[7] Li X,Yang R,Cheng B,et al.Enhanced electrochemical properties of nano-Li₃PO₄ coated on the LiMn₂O₄ cathode material for lithium ion battery at 55°C[J].Materials Letters,2012,66:168-171.
[8] Tan C L,Zhou H J,Li W S,et al.Performance improvement of LiMn₂O₄ as cathode material for lithium ion battery with bismuth modification[J].J Power Sources,2008,184(2):408.
[9] Sahan H,Goktepe H,Patat S.A novel method to improve the electrochemical performance of LiMn₂O₄ cathode active material by CaCO₃ surface coating[J].J Mater Sci Techno,2011,27(5):415-420.
[10] Park S B,Shin H C,Gye W,et al.Improvement of capacity fading resistance of LiMn₂O₄ by amphoteric oxides[J].J Power Sources,2008,180(1):597-601.
[11] Lin Y M,Wu H C,Yen Y C,et al.Enhanced high-rate cycling stability of LiMn₂O₄ cathode by ZrO₂ coating for Li-ion battery[J].J Electrochem Soc,2005,152(8):A1526-A1532.
[12] Zhao G Y,Lin Y B,Zhou T.Enhanced rate and high-temperature performance of La_0.7Sr_0.3MnO₃-coated LiNi_0.5Mn_1.5O₄ cathode materials for lithium ion battery[J].Journal of Power Sources,2012,215:63-68.