Effect of Morphological Tuning on Electrochemical Performance of Perovskite LaCoO3 Anodes†

doi:10.7503/cjcu20190074

Abstract

Abstract:

The perovskite-type LaCoO₃ electrode materials with the morphology of bulk, spherical nanoparticles(NPs) and three-dimensional porous framework(3DPF) were prepared to investigate the relations between the morphology and electrochemical lithium storage properties. It is demonstrated that the electrode materials with different morphologies all show the same perovskite structure, but there is a huge difference in specific capacities. At a current density of 500 mA/g, the specific capacities of the bulk, nano-particles, and three-dimensionally porous framework LaCoO₃ electrodes finally stabilized at 157, 579 and 648 mA·h/g, respectively. The improved specific capacity and cycling stability of porous framework LaCoO₃ are mainly attributed to the larger contact area between the active material and the electrolyte, the smaller particles, the more active sites, and the lower transfer resistance and better retention.

Key words: Lithium ion battery, Lanthanum cobaltite, Porous material, Active site, Anode material

CLC Number:

O646

TrendMD:

FANG Liang,DING Xiaoli,SONG Yun,LIU Dongming,LI Yongtao,ZHANG Qingan. Effect of Morphological Tuning on Electrochemical Performance of Perovskite LaCoO₃ Anodes^†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1456.

Figures/Tables 9

Fig.1 XRD patterns(A) and full width at half maximum chart of (024) faces(B) for LaCoO3 with different morphologies

Fig.2 Rietveld refinement of XRD patterns of Bulk(A), NPs(B) and 3DPF(C) LaCoO3

Fig.3 SEM images(A, B, D, E, G, H) and model images(C, F, I) of Bulk LaCoO3(A—C), NPs LaCoO3(D—F), and 3DPF LaCoO3(G—I)

Fig.4 CV curves(A—C) and galvanostatic charge-discharge curves(D—F) of bulk(A, D), NPs(B, E) and 3DPF(C, F) LaCoO3 electrodes

Fig.5 Nitrogen adsorption-desorption isotherms of bulk, NPs and 3DPF LaCoO3

Table 1 Discharge platform and discharge capacity with voltage higher than 0.75 V as percentage of total discharge capacity

Sample	Capacity retention(%)
Sample	1st	5th
Bulk LaCoO₃	3	25
NPs LaCoO₃	10	28
3DPF LaCoO₃	6	54

Fig.6 Nyquist plots of LaCoO3 electrodes(A) and the corresponding equivalent circuit(B)

Fig.7 Cycling performance curves(A), charge-discharge curves(B) and rate capability(C) of LaCoO3 electrodesCurrent density/(mA·g-1): (A) 500; (B) 1000.

Fig.8 Relationship between morphology and electrochemical performance of bulk(A, D), NPs(B, E) and 3DPF(C, F) LaCoO3

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Effect of Morphological Tuning on Electrochemical Performance of Perovskite LaCoO₃ Anodes^†

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