Structural and Dynamic Studies of Spinel LiNi_0.5Mn_1.5O₄Cathode Material during Initial Charge/Discharge Processes

Authors

Qin WANG, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Li-li ZHOU, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Chong-heng SHEN, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Qi WANG, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Ling HUANG, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;Follow
Jun-tao LI, School of Energy Research, Xiamen University, Xiamen 361005, Fujian, China;
Shi-gang SUN, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;

Corresponding Author

Ling HUANG(huangl@xmu.edu.cn)

Abstract

The spinel LiNi_0.5Mn_1.5O₄ material was synthesized by co-precipitation method with NaOH as a precipitant. The structure and morphology of the as-prepared LiNi_0.5Mn_1.5O₄ materials were characterized by means of XRD、FTIR and SEM. The results indicated that the material belonged to space group and consisted of octahedral particles with the sizes of 3 ~ 6 μm. Electrochemical tests showed the first discharge specific capacity of 121.5 mAh·g^-1 at 0.1C. After 150 cycles, about 99% of reversible capacity was retained for the LiNi_0.5Mn_1.5O₄ material. A combining potentiostatic intermittent titration technique (PITT) with in-situ XRD measurement was applied for discussing the relationship between lattice parameter and the diffusion coefficient of lithium ion (D_Li+) during the first charging-discharging processes. The D_Li+ value measured by PITT was in the range of 10^-10 ~ 10^-11 cm²·s^-1

Graphical Abstract

Keywords

Li-ion battery, co-precipitation, the Li ion diffusion coefficient, in-situ XRD, potentiostatic intermittent titration technique

DOI Link

https://doi.org/10.13208/j.electrochem.150325

Publication Date

2015-08-28

Online Available Date

2015-08-28

Revised Date

2015-04-17

Received Date

2015-03-25

Recommended Citation

Qin WANG, Li-li ZHOU, Chong-heng SHEN, Qi WANG, Ling HUANG, Jun-tao LI, Shi-gang SUN. Structural and Dynamic Studies of Spinel LiNi_0.5Mn_1.5O₄Cathode Material during Initial Charge/Discharge Processes[J]. Journal of Electrochemistry, 2015 , 21(4): 312-318.
DOI: 10.13208/j.electrochem.150325
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss4/2