Advertisement

Bulletin of Materials Science

, 41:155 | Cite as

Distribution of relaxation times investigation of \(\hbox {Co}^{3+}\) doping lithium-rich cathode material \(\hbox {Li}[\hbox {Li}_{0.2} \hbox {Ni}_{0.1} \hbox {Mn}_{0.5} \hbox {Co}_{0.2}]\hbox {O}_{2}\)

  • Wanwan Li
  • Yue Li
  • Xiaolin Yao
  • Minhua Fang
  • Miao Shui
  • Jie Shu
  • Yuanlong Ren
Article
  • 2 Downloads

Abstract

The element \(\hbox {Co}^{3+}\) was introduced into lithium-rich material \(0.5\hbox {Li}_{2}\hbox {MnO}_{3} \cdot 0.5 \hbox {LiNi}_{0.5}\hbox {Mn}_{0.5}\hbox {O}_{2}\) by a polyacrylamide-assisted sol–gel method to form \(\hbox {Li}[\hbox {Li}_{0.2} \hbox {Ni}_{0.1} \hbox {Mn}_{0.5} \hbox {Co}_{0.2}]\hbox {O}_{2}\) and better electro-chemical performances were observed. Electrochemical impedance spectroscopy spectra were measured on 11 specific open circuit voltage levels on the initial charge profile. Then they were converted to the distribution of relaxation times (DRTs) g(\(\tau \)) by self-consistent Tikhonov regularization method. The obtained DRTs offered a higher resolution in the frequency domain and provided the number and the physical origins of loss processes clearly. Through the analysis of DRTs, the rapid augmentation of resistance to electronic conduction and charge transfer within the voltage range 4.46–4.7 V where the removal of \(\hbox {Li}_{2}\hbox {O}\) from \(\hbox {Li}_{2} \hbox {MnO}_{3}\) component took place was the most remarkable phenomenon and the \(\hbox {Co}^{3+}\) doping greatly reduced the resistance to electronic conduction Re. This gave us more evidence about the complicated ‘structurally integrated’ composite character of the material.

Keywords

Electrochemical impedance spectroscopy DRTs lithium rich cathode material Tikhonov regularization 

Notes

Acknowledgements

We gratefully acknowledge the support for this work from 973 Fundamental research program from the Ministry of Science and Technology of China (grant no. 2010CB635116), NSFC project 21173190, National Science Foundation of Zhejiang Province (grant no. LY13B010003), Ningbo Science & Technology Bureau Project 2017A610023 and K. C. Wong Magna Fund in Ningbo University.

References

  1. 1.
    Wang L, Li J G, He X M, Pu W H, Wan C R and Jiang C Y 2009 J. Solid State Electrochem. 13 1157CrossRefGoogle Scholar
  2. 2.
    Thackeray M M, Kang S H, Johnson C S, Vaughey J T, Benedeka R and Hackney S A 2007 J. Mater. Chem. 17 3053CrossRefGoogle Scholar
  3. 3.
    Kang S H and Amine K 2003 J. Power Sources 124 533CrossRefGoogle Scholar
  4. 4.
    Lu Z, Chen Z and Dahn J R 2003 Chem. Mater. 15 3214CrossRefGoogle Scholar
  5. 5.
    Kim J S, Johnson C S, Vaughey J T, Thackeray M M, Hackney S A, Yoon W et al 2004 Chem. Mater. 16 1996CrossRefGoogle Scholar
  6. 6.
    Balasubramanian M, McBreen J, Davidson I J, Whitfield P S and Kargina I 2002 J. Electrochem. Soc. 149 A176CrossRefGoogle Scholar
  7. 7.
    Kang S H, Kempgens P, Greenbaum S, Kropf A J, Aminea K and Thackeray M M 2007 J. Mater. Chem. 17 2069CrossRefGoogle Scholar
  8. 8.
    Thackeray M M, Johnson C S, Vaughey J T, Li N and Hackney S A 2005 J. Mater. Chem. 15 2257CrossRefGoogle Scholar
  9. 9.
    Chao C, Chen S, Shui M, Xu X P, Zheng W D, Feng L et al 2015 Curr. Appl. Phys. 15 149CrossRefGoogle Scholar
  10. 10.
    Levi M and Aurbach D 1997 J. Phys. Chem. B 101 4630CrossRefGoogle Scholar
  11. 11.
    Weese J 1992 Comput. Phys. Commun. 69 99CrossRefGoogle Scholar
  12. 12.
    Honerkamp J and Weese J 1990 Continuum Mech. Thermodyn. 2 17CrossRefGoogle Scholar
  13. 13.
    Weese J 1989 Diploma thesis, Universität FreiburgGoogle Scholar
  14. 14.
    van Loan C 1976 J. Numer. Anal. 13 76CrossRefGoogle Scholar
  15. 15.
    Zheng W D, Xu X P, Cheng L L, Shui M, Shu J, Gao S et al 2013 Ionics 19 1509CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.The State Key Laboratory Base of Novel Functional Materials and Preparation Science, The Faculty of Materials Science and Chemical EngineeringNingbo UniversityNingboPeople’s Republic of China

Personalised recommendations