聚(3-己基噻吩)包覆富锂层状正极材料Li1.18Ni0.15Co0.15Mn0.52O2的制备与电化学性能

doi:10.7503/cjcu20180683

高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (4): 777.doi: 10.7503/cjcu20180683

聚(3-己基噻吩)包覆富锂层状正极材料Li_1.18Ni_0.15Co_0.15Mn_0.52O₂的制备与电化学性能

陈红¹(), 杜勇慧², 张鑫², 刘文闫², 周晓明²

1. 北华大学理学院
2. 材料科学与工程学院, 吉林 132013

收稿日期:2018-10-10 出版日期:2019-04-03 发布日期:2019-01-24
作者简介:
联系人简介: 陈红, 女, 博士, 教授, 主要从事功能材料方面的研究. E-mail: chlht518@163.com
基金资助:
国家自然科学基金(批准号: 51602006, 61604003)资助.

Preparation and Electrochemical Properties of Poly(3-hexylthiophene)-coated Lithium-rich Layered Cathode Material Li_1.18Ni_0.15Co_0.15Mn_0.52 $O 2 †$

CHEN Hong^1,^*(), DU Yonghui², ZHANG Xin², LIU Wenyan², ZHOU Xiaoming²

1. School of Science
2. College of Materials Science and Engineering, Beihua University, Jilin 132013, China

Received:2018-10-10 Online:2019-04-03 Published:2019-01-24
Contact: CHEN Hong E-mail:chlht518@163.com
Supported by:
† Supported by the National Natural Science Foundation of China(Nos. 51602006, 61604003).

摘要/Abstract

摘要：

采用溶胶-凝胶法合成了Li_1.18Ni_0.15Co_0.15Mn_0.52O₂富锂层状正极材料, 并使用聚(3-己基噻吩)对其进行了表面包覆. 采用多种光谱学和电化学手段对材料的形貌结构和电化学性能进行了分析. 结果表明, 聚(3-己基噻吩)溶液浸泡后在富锂材料表面形成厚约1.5 nm的均匀包覆层. 表面包覆后富锂层状正极材料的极化和阻抗明显减小. 在0.2C倍率下, 经过100次充放电循环后, 未包覆的富锂材料放电比容量衰减为170 mA·h/g, 而经过0.3%聚(3-己基噻吩)包覆的材料的放电比容量则保持在205 mA·h/g, 容量保持率由68%提高到82%; 10C倍率下的放电比容量由72 mA·h/g提高到116 mA·h/g.

关键词: 锂离子电池, 正极材料, 表面包覆, 富锂材料, 聚(3-己基噻吩)

Abstract:

Lithium-rich layered cathode material Li_1.18Ni_0.15Co_0.15Mn_0.52O₂ was synthesized by sol-gel method and then coated with poly(3-hexylthiophene). Varies spectroscopic and electrochemical techniques were used to analyze the morphology and electrochemical properties of the materials. The results showed that a homogeneous coating layer with a thickness of ca. 1.5 nm was formed on the surface of the material. The electrode polarization and impedance of the material were obviously reduced by surface coating. After 100 cycles at 0.2C, the specific capacity of the original material decreased to 170 mA·h/g, while that of the 0.3% poly(3-hexylthiophene) coated material still remained at 205 mA·h/g. The corresponding capacity retention increased from 68% to 82%. Moreover, the discharge capacity at 10C rate increased from 72 mA·h/g to 116 mA·h/g.

Key words: Lithium-ion battery, Cathode material, Surface coating, Li-rich material, Poly(3-hexylthiophene)

中图分类号:

O646

TrendMD:

陈红, 杜勇慧, 张鑫, 刘文闫, 周晓明. 聚(3-己基噻吩)包覆富锂层状正极材料Li_1.18Ni_0.15Co_0.15Mn_0.52O₂的制备与电化学性能. 高等学校化学学报, 2019, 40(4): 777.

CHEN Hong,DU Yonghui,ZHANG Xin,LIU Wenyan,ZHOU Xiaoming. Preparation and Electrochemical Properties of Poly(3-hexylthiophene)-coated Lithium-rich Layered Cathode Material Li_1.18Ni_0.15Co_0.15Mn_0.52 $O 2 †$ . Chem. J. Chinese Universities, 2019, 40(4): 777.

图/表 11

Fig.1 XRD patterns of the original and P3HT coated Li-rich materialsa. Original; b. 0.1%P3HT; c. 0.3%P3HT; d. 0.5%P3HT.

Fig.2 SEM images of the original(A, B) and 0.3%P3HT coated(C, D) Li-rich materials

Fig.3 High resolution TEM images of the original(A) and 0.3%P3HT coated(B) Li-rich material

Fig.4 FTIR spectra of the original(a) and 0.5% P3HT coated(b) Li-rich materials

Fig.5 Cyclic performance of the original and P3HT coated Li-rich materials at 0.2C rate(40 mA/g)

Fig.6 Charge/discharge curves of the original(A) and 0.3%P3HT coated(B) material at 0.2C rate

Fig.7 Rate performance of the original and P3HT coated Li-rich materials

Fig.8 Charge/discharge curves of the original(A) and P3HT coated(B) Li-rich materials at different cycle rates

Fig.9 CV curves of original and P3HT coated Li-rich materials in initial five cycles (A) Original; (B) 0.1%P3HT; (C) 0.3%P3HT; (D) 0.5%P3HT.

Fig.10 Comparison of the fifth CV curves

Fig.11 Nyquist curves of the original(a) and 0.3%P3HT coated(b) Li-rich materials(A) and the equivalent circuit(B)R0 is the internal resistance, RSEI/CSEI are the SEI resistance/capacitance, respectively; Rct/Cdl are the charge transfer resistance/capacitance, respectively; W0 is the Warburg resistance. First charge to 4.5 V.

参考文献 20

[1]	Li W. W., Yao L., Chen G. R., Electron. Compon.Mater.,2012, 31(3), 77—81
[2]	Chung S. Y., Bloking J. T., Chiang Y. M., Nat.Mater.,2003, 1(2), 123—128
[3]	Yi X., Wang X. Y., Ju B. W., Electrochim.Acta,2014, 134(21), 143—149
[4]	Kim D. H., Kang S. H., Balasubramanian M., Electrochem.Commun.,2010, 12(8), 1618—1621
[5]	Huang X. K., Zhang Q. S., Chang H. T., J. Electrochem.Soc.,2009, 156(3), 162—168
[6]	Rozier P., Tarascon J. M., J. Electrochem.Soc.,2015, 162(14), A2490—A2499
[7]	Song B., Lai M. O., Liu Z., J. Mater. Chem.A,2013, 1(34), 9954—9965
[8]	Zou G., Yang X., Wang X., J. Solid State Electr.,2014, 18(7), 1789—1797
[9]	Shi S. J., Tu J. P., Tang Y. Y., Electrochim.Acta,2013, 88(2), 671—679
[10]	Ranieri E. D., Nat.Energy, 2016, 1(8), 16122—16124
[11]	Shen C. H., Wang Q., Fu F., ACS Appl. Mat.Interfaces,2014, 6(8), 5516—5524
[12]	Jarvis K. A., Deng Z., Allard L. F., Chem.Mater.,2011, 23(16), 3614—3621
[13]	Wu F., Liu J., Li L., ACS Appl. Mat.Interfaces,2016, 8(35), 23095—23104
[14]	Fu Q., Du F., Bian X. F., J. Mater. Chem.A,2014, 2(20), 7555—7562
[15]	Zhuang G. V., Chen G., Shim J., J. Power Sources,2004, 134(2), 293—297
[16]	Hintz H., Sessler C., Peisert H., Chem.Mater.,2012, 24(14), 2739—2743
[17]	Lu Z. H., Beaulieu L. Y., Donaberger R. A., J. Electrochem.Soc.,2002, 149(6), A778—A791
[18]	Xie Y., Saubanere M., Doublet M. L., Energy Environ.Sci.,2017, 10(1), 266—274
[19]	Liu C., An J., Guo R., J. Alloy.Compd.,2013, 563(3), 33—38
[20]	Liu J., Manthiram A., J. Mater.Chem.,2010, 20(19), 3961—3967

聚(3-己基噻吩)包覆富锂层状正极材料Li_1.18Ni_0.15Co_0.15Mn_0.52O₂的制备与电化学性能

Preparation and Electrochemical Properties of Poly(3-hexylthiophene)-coated Lithium-rich Layered Cathode Material Li_1.18Ni_0.15Co_0.15Mn_0.52 $O 2 †$

RichHTML

PDF (PC)