Aqueous Solution-Evaporation Route Synthesis and Phase Structural Research of the Li-Rich Cathode Li_1.23Ni_0.09Co_0.12Mn_0.56O₂ by In-Situ XRD

Authors

Chong-Heng SHEN, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;
Shou-Yu SHEN, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;
Zhou LIN, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;
Xiao-Mei ZHENG, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;
Hang SU, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;
Ling HUANG, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;Follow
Jun-Tao LI, School of Energy Research, Xiamen University, Fujian Xiamen 361005;
Shi-Gang SUN, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Fujian Xiamen 361005;

Corresponding Author

Ling HUANG(huangl@xmu.edu.cn)

Abstract

The Li-rich Li_1.23Ni_0.09Co_0.12Mn_0.56O₂ material was synthesized via aqueous solution-evaporation route. The structure and morphology of the material were characterized by means of XRD and SEM. The results indicated that the single particle of the product was polygonal with the size of 330 nm and the structure was layered solid solution with a certain amount of Li₂MnO₃. Electrochemical tests showed that the first discharge capacity of the Li-rich layered material was 250.8 mAh·g^-1 at 0.1C，the capacity retention was 86.5% after 40 cycles. Through in-situ XRD study a new phase Li_0.9MnO₂ which would cause electrochemical properties deteriorated due to its structure transformation from layered to spinel came out with a small amount during the first charge-discharge cycle. Moreover, the value of c-parameter increased first and decreased before 4.54 V, and remained stable till the end of the first charge, and then reduced from the first discharge to the second charge continually. However, the value of a-parameter underwent a falling-steady-rising course. The change in the values of the lattice parameters corresponded to the variation of electrochemical behaviors.

Graphical Abstract

Keywords

Li-ion battery, cathode, aqueous solution-evaporation route, in-situ XRD, structure transformation

DOI Link

https://doi.org/10.13208/j.electrochem.130359

Publication Date

2013-12-28

Online Available Date

2013-12-23

Revised Date

2013-07-01

Received Date

2013-05-31

Recommended Citation

Chong-Heng SHEN, Shou-Yu SHEN, Zhou LIN, Xiao-Mei ZHENG, Hang SU, Ling HUANG, Jun-Tao LI, Shi-Gang SUN. Aqueous Solution-Evaporation Route Synthesis and Phase Structural Research of the Li-Rich Cathode Li_1.23Ni_0.09Co_0.12Mn_0.56O₂ by In-Situ XRD[J]. Journal of Electrochemistry, 2013 , 19(6): 537-543.
DOI: 10.13208/j.electrochem.130359
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss6/6