Preparation and Characterizations of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 Cathode Materials for Lithium Ion Batteries†

doi:10.7503/cjcu20140905

Abstract

Abstract:

Zn-doped Li_1.13Ni_0.3-_xMn_0.57Zn_xO₂ samples were synthesized by co-precipitation method. X-ray diffraction shows that Zn doping decreases the Li⁺/Ni²⁺ cation mixing of the material, increases the structure stability and expands the lattice volume of the material which provides more space for lithium ion intercalation/de-intercalation. Electrochemical experiments show that Zn doping decreases the charge transfer resistance of the electrode, improves the reversibility of lithium intercalation and de-intercalation, thus the electrochemical properties of the material are improved. Especially, the Li_1.13Ni_0.29Mn_0.57Zn_0.01O₂ material with Zn doping of x=0.01 shows the best electrochemical performance with the largest discharge capacity, best rate capability, excellent capacity retention and thermal stability.

Key words: Li-rich layered cathode material, Zinc-doping, Electrochemical property, Thermal stability

CLC Number:

TrendMD:

WANG Xue, YANG Lili, WANG Chunzhong, CHEN Gang, WEI Yingjin. Preparation and Characterizations of Zn-doped Li_1.13Ni_0.3-_xMn_0.57Zn_xO₂ Cathode Materials for Lithium Ion Batteries^†[J]. Chem. J. Chinese Universities, 2015, 36(4): 733.

Figures/Tables 9

Fig.1 XRD patterns of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 a. x=0; b. x=0.01; c. x=0.02.

Table 1 Lattice parameters and intensity ratio of the (003) and (104) reflections of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2

x	a, b/nm	c/nm	c/a	I₍₀₀₃₎/I₍₁₀₄₎
0	0.28782	1.42421	4.948	1.42
0.01	0.28786	1.43025	4.968	1.47
0.02	0.28852	1.43125	4.960	1.31

Fig.2 SEM images of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 (A) x=0; (B) x=0.01; (C) x=0.02.

Fig.3 First charge(a—c)-discharge(a'—c') curves of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 a, a'. x=0; b, b'. x=0.01; c, c'. x=0.02.

Fig.4 Cyclic performance of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 at a current density of 50 mA/g a. x=0; b. x=0.01; c. x=0.02.

Fig.5 Rate dependent cyclic performance of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2

Fig.6 Discharge curves of Zn-doped Li1.13Ni0.3-xMn0.57·ZnxO2 at different current densities (A) x=0; (B) x=0.01; (C) x=0.02. Current density/(mA·g-1): a. 50; b. 100; c. 500; d. 1000.

Fig.7 Nquist plots of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 a. x=0; b. x=0.01; c. x=0.02.

Fig.8 DSC curves of Zn-doped Li1.13Ni0.3-xMn0.57ZnxO2 a. x=0; b. x=0.01; c. x=0.02.

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Preparation and Characterizations of Zn-doped Li_1.13Ni_0.3-_xMn_0.57Zn_xO₂ Cathode Materials for Lithium Ion Batteries^†

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