Morphology Control and Lithium Storage Performance of Micro/nano Li-rich Cathode Material†

doi:10.7503/cjcu20180829

Abstract

Abstract:

Hierarchical micro/nano Li-rich Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode material was synthesized by urea-based hydrothermal method followed by a heat treatment. The structure and morphology of precursor particles and cathode material particles could be tailored by different reaction solvents. The fusiform Li-rich layered material Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ delivers an discharge capacity about 300 mA·h/g at a current density of 0.1C and 92 mA·h/g at 5C. Also, the cathode material has a capacity retention of 85% after 70 cycles at 0.5C, showing an excellent cycling performance and rate performance. This method is instructive for synthesizing other cathode materials in energy storage field.

Key words: Micro/nano structure, Li-rich layered cathode material, Morphology control, Lithium-ion battery

CLC Number:

O646

TrendMD:

YANG Jinge, LI Yujie, LU Di, CHEN Yufang, SUN Weiwei, ZHENG Chunman. Morphology Control and Lithium Storage Performance of Micro/nano Li-rich Cathode Material^†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1495.

Figures/Tables 8

Scheme 1 Schematic formation of LR-H2O via hydrothermal reaction

Fig.2 XRD patterns of LR-H2O(a), LR-EG(b) and LR-CH3COONH4(c)precursor; (C2) LR-CH3COONH4, sintered.

Table 1 Comparison of lattice parameters and partial diffraction peaks analysis for the samples

Sample	a/nm	c/nm	c/a ratio	I₍₀₀₃₎/I₍₁₀₄₎	I₍₁₁₀₎/I₍₁₀₈₎
LR-H₂O	0.2846	1.4179	4.982	1.78	1.35
LR-EG	0.2844	1.4210	4.996	1.25	1.14
LR-CH₃COONH₄	0.2851	1.4211	4.985	1.88	1.91

Fig.3 Cycling performance of the three cathode samples at rate of 0.1C

Fig.4 Rate performance of the three cathode samples

Fig.5 Cycling performance of sample LR-CH3COONH4 at rate of 0.5C

Fig.6 SEM images(A, B) and cycling performance of samples LR-CH3COONH4 and LR-Nano at 0.1C(C)(A) LR-CH3COONH4; (B) LR-Nano.

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