化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (10) : 115-118.

新材料与新技术

PEG辅助溶剂热合成锂离子电池纳米正极材料磷酸铁锂的研究

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Study on polyethylene glycol-assisted solvothermal synthesis of lithium iron phosphate nanoparticle for lithium-ion battery

Chen Huihui, Wang Juan , Xu Yunhua

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摘要

在一元溶剂的基础上,以不同分子量的聚乙二醇(PEG)-水作为共溶剂,采用溶剂热法制备磷酸铁锂(LiFePO₄),并制得锂离子电池纳米正极材料,并对产物的结构、形貌和电化学性能进行了研究。研究结果表明:溶剂PEG的引入具有对材料颗粒细化的作用,有效的减小锂离子的扩散和迁移途径,在PEG分子量为600制得的锂离子电池纳米正极材料的颗粒尺寸最小,在0.1C倍率条件下,放电比容量达147.1mAh/g,经过50次循环后容量保持率为92.5%,且电荷转移阻抗最小为125Ω。

Abstract

Based on the study of one dimension solvent,the nano-LiFePO₄ for Li-ion battery anode was prepared via solvothermal method using polyethylene glycol (PEG) with different molecular weight in a water-polyethylene glycol (PEG) binary solvent.Research indicated:the introduction of solvent PEG had the effect of refining the material particles,effectively reducing the diffusion and migration pathway of Li ions.When PEG molecular weight was 600,the particle size was the smallest.At 0.1C rate,the specific discharge capacity was 147.1mAh/g.After 50 cycles,the capacity retention rate was 92.5%.Charge transfer resistance was 125Ω.

关键词

磷酸铁锂 / 溶剂热 / 共溶剂 / 纳米粒子 / PEG

Key words

lithium iron phosphate / solvothermal synthesis / co-solvent / nanoparticle / PEG

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PEG辅助溶剂热合成锂离子电池纳米正极材料磷酸铁锂的研究[J]. 化工新型材料, 2018, 46(10): 115-118 DOI:

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参考文献

原文顺序 | 出版日期 | 本文引用

[1] Park O K,Cho Y,Lee S,et al.Who will drive electric vehicles,olivine or spinel[J].Energy & Environmental Science,2011,4(5):1621-1633.
[2] Bewlay S L,Konstantinov K,Wang G X,et al.Conductivity improvements to spray-produced LiFePO₄ by addition of a carbon source[J].Materials Letters,2004,58:1788-1791.
[3] Srinivasan V,Newman J.Existence of path-dependence in the LiFePO₄ electrode[J].Electrochemical and Solid-State Letters,2006,9(3):A110-A114.
[4] Gabersce K,Dominko R,Jamnik J.Is small particle size more important than carbon coating:an example study on LiFePO₄ cathodes[J].Electrochem Soc,2007,9(12):2778-2783.
[5] Franger S,Benott C,Bouron C,et al.Chemistry and electro-chemistry of composite LiFePO₄ materials for secondary lithium batteries[J].Phys Chem Solids,2006,67(5/6):1338-1342.
[6] Kim C W,Park J S,Lee K S.Effect of Fe₂P on the electron conductivity and electrochemical performance of LiFePO₄ synthesized by mechanical alloying using Fe³⁺ raw material[J].J Power Sources,2006,163(1):144-150.
[7] Zhou N,Wang H Y,Uchaker E,et al.Additive-free solvothermal synthesis and Li-ion intercalation properties of dumbbell-shaped LiFePO₄/C mesocrystals[J].Journal of Power Sources,2013,239(10):103-110.
[8] Konarova M,Taniguchi I.Preparation of carbon coated LiFePO₄ by a combination of spray pyrolysis with planetary ball-milling followed by heat treatment and their electrochemical properties[J].Powder Technology,2009,191(1/2):111-116.
[9] Bhattacharyya S,Gedanken A.Microwave-assisted insertion of silver nanoparticles into 3-D mesoporous zinc oxide nanocomposites and nanorods[J].J Phys Chem C,2008,112(3):659-665.
[10] 尚怀芳.锂离子电池正极材料LiFePO₄和LiMn₂O₄的表面结构及电化学性性能研究[D].北京:北京工业大学,2013.
[11] Sun C,Rajasekhara S,Goodenough J B,et al.Monodisperse porous LiFePO₄ microspheres for a high power Li-ion battery cathode[J].Journal of the American Chemical Society,2011,133(7):2132-2135.
[12] Ghafarian-Zahmatkesh H,Javanbakht M,Ghaemi M.Ethylene glycol-assisted hydrothermal synthesis and characterization of bow-tie-like lithium iron phosphate nanocrystals for lithium-ion batteries[J].Journal of Power Sources,2015,284(1):339-348.
[13] Tajimi S,Ikeda Y,Uematsu K,et al.Enhanced electrochemical performance of LiFePO₄ prepared by hydrothermal reaction[J].Solid State Ionics,2004,175(1/4):287-290.
[14] 程菲,孙蔷,陆安慧,等.溶剂热法制备锂离子电池正极材料磷酸铁锂[J].电源技术,2013,37(5):744-746.
[15] Ni J,Morishita M,Kawabe Y,et al.Hydrothermal preparation of LiFePO₄ nanocrystals mediated by organic acid[J].J Power Sources,2010,195(9):2877-2882.

基金资助

国家自然科学基金(51202179);教育部科学技术研究重点项目(212174);陕西省自然科学基金(2013KJXX-57);陕西省教育厅自然科学基金项目(14JS047,14JS048,16JS058);国家国际科技合作专项资助(2015DFR50350);金川-西安建筑科技大学预研究项目(X06071)