Effect of FePO4 Coating on Performance of Li1.2Mn0.54Ni0.13Co0.13O2 as Cathode Material for Li-ion Battery

doi:10.15541/jim20140268

Abstract

Abstract:

Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ with a rod-like morphology was prepared by a carbonate co-precipitation method followed by a high-temperature solid state reaction, and coated with different amounts of FePO₄. XRD results and SEM images show that the particles of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ are uniformly coated with amorphous FePO₄. The amorphous FePO₄ layer not only inhibits the reaction between Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ and electrolyte, but also acts as lithium ion receptor during the initial charging process. So, the surface modification of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ with FePO₄ reduces the initial irreversible capacity loss, and improves cyclic and rate performance. Specific electrochemical performance can be achieved by adjusting the amount of FePO₄. Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ coated with 2wt% FePO₄ exhibits the highest initial charge and discharge capacity, 325.9 and 258.4 mAh/g at 0.05C rate, respectively. The material coated with 4wt% FePO₄ shows high discharge capacity and good cycle stability. And with the increase of FePO₄ amounts, the initial coulombic efficiency increases greatly, reaching 97.4% for the sample coated with 20wt% FePO₄.

Key words: Li1.2Mn0.54Ni0.13Co0.13O2, carbonate co-precipitation, FePO4, surface modification

CLC Number:

TQ152

LI Zhong, HONG Jian-He, HE Gang, Lü Lu. Effect of FePO₄ Coating on Performance of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as Cathode Material for Li-ion Battery[J]. Journal of Inorganic Materials, 2015, 30(2): 129-134.

Figures/Tables 7

Fig. 1 XRD patterns of pristine and FePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2

Fig. 2 SEM images of pristine and FePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2 (a) Pristine; (b) 6wt% FePO4; (c) 10wt% FePO4; (d) 20wt% FePO4

Fig. 3 Initial charge/discharge curves of the pristine and FePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2 at 0.05C rate

Fig. 4 Initial charge/discharge capacity and irreversible capacity loss of the pristine and FePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2

Fig. 5 Cyclic performance of pristine and FePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2 at 0.5C rate

Fig. 6 Rate capability of pristine and FePO4-coated Li1.2Mn0.54 Ni0.13Co0.13O2

Fig. 7 Electrochemical impedance spectra (EIS) of pristine and FePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2

References 23

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Effect of FePO₄ Coating on Performance of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as Cathode Material for Li-ion Battery

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